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[Management of arterial hypertension: results of a Tunisian general practitioner survey].

The control of arterial hypertension (HT) is an endlessly hoped objective but usually not reached. Several factors are determinants. The physician role is crucial in the HT prevention. In order to evaluate knowledge, attitudes and behaviours of Tunisian physicians in HT management, we conducted a cross sectional study in 2002 using a self administered questionnaire addressed to physicians working in private and public sectors. 380 generalists participated to this study. 95.5% of them confirmed that HT constitutes a public health problem. 81.1% saw at least 4 patients with HT a week. 95% insisted on the importance of the primary prevention. 90% took care themselves patients. 71.5% confirmed the importance of a training and an entrainement for the measure of the blood pressure (BP). 3.7% made diagnosis after a single visit and 10.9% confirmed it only from described symptoms. 20.4% of the generalists chose the old classification as objective level of BP. Thiazidic Diuretics and beta blockers were most prescribed medicines in first intention. 9.4% stopped the treatment after stabilization of blood pressure. 60% of generalists had inadequate behaviour facing a not stabilized BP. Non observance of treatment by patients was indicated by 31% of the generalists, cost and break of the medicines' stock and disappearance of symptoms were the main causes advanced by the generalists. This study shows the existence of gaps in generalists' practical behaviour treating this disease. Measures aiming the medical practice improvement turn out necessary in particular the sensitization of the generalists by an adequate university training and a continuous medical training, and a regular evaluation of the national program of hypertension prevention and management.

Adult↗

Benchmarking the US physician workforce. An alternative to needs-based or demand-based planning.

OBJECTIVE: To propose population-based benchmarking as an alternative to needs- or demand-based planning for estimating a reasonably sized, clinically active physician workforce for the United States and its regional health care markets. DESIGN: Cross-sectional analysis of 1993 American Medical Association and American Osteopathic Association physician masterfiles. POPULATION: The resident population of the 306 hospital referral regions in the United States. MAIN OUTCOME MEASURES: Per capita number of clinically active physicians by specialty adjusted for age and sex population differences and out-of-region health care utilization. The measured physician workforce was compared with 4 benchmarks: the staffing within a large (2.4 million members) health maintenance organization (HMO), a hospital referral region dominated by managed care (Minneapolis, Minn), a hospital referral region dominated by fee-for-service (Wichita, Kan), and the proposed "balanced" physician supply (50% generalists). RESULTS: The proportion of the US population residing in hospital referral regions with a higher per capita generalist workforce than the benchmark was 96% for the HMO benchmark, 60% for Wichita, and 27% for Minneapolis. The specialist workforce exceeded all 3 benchmarks for 74% of the population. The per capita workforce of generalists was not related to the proportion of generalists among regions (Pearson correlation coefficient=0.06; P=.26). CONCLUSIONS: Population-based benchmarking offers practical advantages to needs- or demand-based planning for estimating a reasonably sized per capita workforce of clinically active physicians. The physician workforce within the benchmarks of an HMO and health care markets indicates the varying opportunities for regional physician employment and services. The ratio of generalists to specialists does not measure the adequacy of the supply of the generalist workforce either nationally or for specific regions. Research measuring the relationship between physician workforces of different sizes and population outcomes will guide the selection of future regional benchmarks.

Catchment Area, Health↗

Are two doctors better than one? Women's physician use and appropriate care.

This study examines nonelderly women's concurrent use of two types of physicians (generalists and obstetrician-gynecologists) for regular health care and associations with receipt of preventive care, including a range of recommended screening, counseling, and heart disease prevention services. Data are from the 1999 Women's Health Care Experiences Survey conducted in Baltimore, Maryland, using random digit dialing (N = 509 women ages 18 to 64). Key findings are: 58% of women report using two physicians (a generalist and an ob/gyn) for regular care; seeing both a generalist and an ob/gyn, compared with seeing a generalist alone, is consistently associated with receiving more clinical preventive services, including screening, counseling, and preventive services related to heart disease. Because seeing an ob/gyn in addition to a generalist physician is associated with receiving recommended preventive services (even for heart disease), the findings suggest that non-elderly women who rely on a generalist alone may receive substandard preventive care. The implications for women's access to ob/gyns and for appropriate design of women's primary care are discussed.

Adolescent↗

Influence of physician specialty on adoption and relinquishment of calcium channel blockers and other treatments for myocardial infarction.

OBJECTIVE: Recent reports have linked calcium channel blockers (CCBs) with an increased risk of acute myocardial infarction (AMI). We sought to determine to what extent physicians relinquished CCBs following these adverse reports and if there were differences in the use of CCBs and other AMI therapies across 3 levels of specialist involvement: generalist attendings, collaborative care (generalist with cardiologist consultation), and cardiologist attendings. DESIGN: We measured use of CCBs during hospitalization for AMI before (1992--1993) and after (1995--1996) the adverse CCB reports, controlling for hospital-, physician-, and patient-level variables. We also examined use of effective medications (aspirin, beta-blockers, thrombolytic therapy) and ineffective AMI treatments (lidocaine). SETTING: Thirty-seven community-based hospitals in Minnesota. PATIENTS: Population-based sample of 5,347 patients admitted with AMI. MEASUREMENTS: The primary outcome was prescription of a CCB at the time of discharge from hospital. Secondary outcomes included use of other effective and ineffective AMI therapies during hospitalization and at discharge. MAIN RESULTS: Compared with cardiologists, generalist attendings were less likely to use aspirin (37% vs 68%; adjusted odds ratio [OR], 0.58; 95% confidence interval [95% CI], 0.42 to 0.80) and thrombolytics (29% vs 64%; adjusted OR, 0.18; 95% CI, 0.13 to 0.25), but not beta-blockers (20% vs 46%; adjusted OR, 0.93; 95% CI, 0.66 to 1.31). From 1992--1993 to 1995--1996, the use of CCBs in patients with AMI decreased from 24% to 10%, the net result of physicians starting CCBs less often and discontinuing them more often. In multivariate models, the odds of CCB relinquishment after the adverse reports (adjusted OR, 0.33; 95% CI, 0.27 to 0.39) were independent of, and not modified by, the involvement of a cardiologist. CONCLUSIONS: Compared with cardiologists, generalist physicians were less likely to adopt some effective AMI therapies, particularly those associated with risk such as thrombolytic therapy. However, generalists were as likely as cardiologists to relinquish CCBs after the adverse reports. This pattern of practice may be the generalist physicians' response to an expanding, but increasingly risky and uncertain, pharmacopoeia.

Adrenergic beta-Antagonists↗

Impact of gastroenterology consultation on the outcomes of patients admitted to the hospital with decompensated cirrhosis.

Managed care has strongly discouraged generalists from referring patients to specialists in an effort to reduce the costs of health care. The aim of this study was to compare patient outcomes when generalists work together with gastroenterologists or alone in the management of patients admitted to the hospital with decompensated cirrhosis. Consecutive patients admitted to the hospital with decompensated cirrhosis over a 1-year period were identified. We compared the length of stay, cost of hospitalization, incidence of hospital readmission, and mortality for patients who did and those who did not have a gastroenterology (GI) consultation. A GI consultation was requested for 107 of the 197 patients (54.3%). Patients who had a GI consultation had a significantly shorter length of stay (5.6 +/- 3.5 vs. 10.1 +/- 5.8 days, P <.001) and a lower cost of hospitalization ($6,004 +/- $4,994 vs. $10,006 +/- $6,183, P <.001) than those patients who were managed by generalists alone. The 30-day incidence of readmission (13.3% vs. 27.8%, P =.01) and mortality (7.5% vs. 16.7%, P =.045) were significantly lower in the GI consultation group. During a median follow-up of 618 days (range, 2-970), patients who had a GI consultation during hospitalization had a significantly longer time to hospital readmission (P <.001) and improved survival (P =.02) compared with those who were managed by generalists alone. In conclusion, for patients admitted to the hospital with decompensated cirrhosis, individuals who were managed by generalists in conjunction with gastroenterologists had better outcomes than those who were managed by generalists alone.

Aged↗

Genomic rearrangements at rrn operons in Salmonella.

Most Salmonella serovars are general pathogens that infect a variety of hosts. These "generalist" serovars cause disease in many animals from reptiles to mammals. In contrast, a few serovars cause disease only in a specific host. Host-specific serovars can cause a systemic, often fatal disease in one species yet remain avirulent in other species. Host-specific Salmonella frequently have large genomic rearrangements due to recombination at the ribosomal RNA (rrn) operons while the generalists consistently have a conserved chromosomal arrangement. To determine whether this is the result of an intrinsic difference in recombination frequency or a consequence of lifestyle difference between generalist and host-specific Salmonella, we determined the frequency of rearrangements in vitro. Using lacZ genes as portable regions of homology for inversion analysis, we found that both generalist and host-specific serovars of Salmonella have similar tolerances to chromosomal rearrangements in vitro. Using PCR and genetic selection, we found that generalist and host-specific serovars also undergo rearrangements at rrn operons at similar frequencies in vitro. These observations indicate that the observed difference in genomic stability between generalist and host-specific serovars is a consequence of their distinct lifestyles, not intrinsic differences in recombination frequencies.

Base Sequence↗

Generalism in medical education: the next steps.

The Association of American Medical Colleges accepted in full the strategies recommended by its Generalist Task Force in 1992, in particular the central goal that a majority of graduating medical students be committed to careers in generalist specialties and that medical schools make appropriate efforts to reach this goal as quickly as possible. Both generalists and specialists need a revised education. For example, they will have to master intellectually challenging analytic sciences fundamental to general practice, such as clinical epidemiology, decision analysis, health care economics, and medical informatics. Also, they must be educated in ambulatory care settings, which are most like generalist medical practice. Also, the medical faculty must contain large numbers of generalists, who will serve on important institutional committees and be involved in health services research and decision analysis. To educate generalist physicians, academic medicine must tackle many challenges effectively. It will, because medical education has a fundamental responsibility to produce a physician workforce that meets the needs of the American people.

Education, Medical↗

Overcoming barriers to generalism in medicine: the residents' perspective.

At a 1993 conference sponsored by the U.S. Bureau of Health Professions, a group of residents in several disciplines discussed barriers to generalism in medicine and ways to overcome them. In medical school, the barriers have to do with the lack of strong generalist mentors and lack of appropriate training in ambulatory generalist practice. In residency programs, the system does not support continuity of care and contains too few generalists as preceptors in clinical settings. The ambulatory clinic's inefficiency reinforces residents' frustrations and disillusionment with primary care practice. Further, the culture of medicine denigrates generalism and gives prestige and respect to subspecialists. In academic medicine, the dichotomy between scientist-physicians and clinician-physicians is a barrier. The public has adopted the perception promulgated by the medical leadership that generalists are less skilled and have less to offer than subspecialists. The residents offered recommendations for medical schools (changes in faculty and administration, curriculum, and financial support), for residency programs (changes in curriculum and structure), for the culture of medicine, and for public awareness. To increase the role of the generalist physicians, academic medicine institutions must pursue systematic, broad-based approaches to overcome barriers to generalist education and practice.

Attitude of Health Personnel↗

Assessment of physicians' interest in primary care training/retraining.

PURPOSE: To assess generalists and specialists interest in primary care training and the factors associated with this interest. METHOD: The study sample was drawn from the alumni of the Jefferson Medical College of Thomas Jefferson University (classes of 1970-1990) who were practicing in Pennsylvania. Family practitioners and general internists were defined as generalists; obstetrician-gynecologists (ob-gyns) and internal medicine subspecialists were defined as specialists. In 1995 a questionnaire was mailed consisting of 46 items assessing the physicians' interest in participating in primary care educational programs, reasons for any such interest, and preferences for content. Two items on the specialists' questionnaire asked about changing careers from specialist to generalist, and two items on the generalists' questionnaire asked about broadening the scope of their practices. RESULTS: The response rate was 54% (381/707). In all, 78% of the physicians expressed interest in primary care training. The generalists were more interested in primary care training than were the specialists (p < .001). The ob-gyns were more interested in primary care training than were the medical subspecialists (p = .01). Few of the medical subspecialists and no ob-gyns were influenced by plans to change careers to primary care. More of the ob-gyns than the medical subspecialists were motivated by plans to shift emphasis to provide more primary care. CONCLUSION: The results suggest (1) that although many specialists have an interest in primary care training, it is rarely motivated by plans to change to primary care practice, and (2) that generalists are very interested in expanding their abilities. Both of these findings should be considered in workforce planning.

Adult↗

Associations between primary care-oriented practices in medical school admission and the practice intentions of matriculants.

PURPOSE: To assess associations of primary-care-oriented medical school admission practices with matriculants practice intentions. METHOD: The authors performed cross-sectional, secondary analyses of databases from the Association of American Medical Colleges (AAMC). The independent variables were four medical school admission practices. The control variable was school ownership (public vs private). The dependent variables were the proportions of matriculants at each school interested in generalism, rural practice, and locating in a socioeconomically deprived area. RESULTS: One hundred and twenty medical schools (95%) completed the AAMC's Survey of Generalist Physician Initiatives in either 1993 or 1994; 94% of matriculants replied to the AAMC's 1994 Matriculating Student Questionnaire. Twenty-five percent of the schools had admission committee chairs who were generalists, half had over 25% generalists on their admission committees, 64% gave admission preference to students likely to become generalists, and 33% reported premedical recruitment efforts that targeted applicants likely to become generalists. In multivariable analyses, premedical recruitment efforts and public school ownership (all p < .01) were associated with greater interest of matriculants in both generalism and rural practice. CONCLUSIONS: Public medical schools and schools with premedical recruitment activities targeting future generalists admitted greater proportions of students interested in primary care and rural practice.

Career Choice↗

Primary care at a crossroads.

The author explains why primary care is especially beleaguered today (e.g., growth in specialization and widening income gaps between specialists and generalists, growth of managed care, cutbacks in Medicare and Medicaid payments to academic medical centers, and pro-technology biases in fee-for-service payment). Medical students sense primary care's troubles; primary care residency matches continue to decline. Attempts to encourage generalist practice cannot compete with such forces as pro-specialist reimbursement policies, the way research is funded, the dominance of specialist role models, and the daunting knowledge demands of the generalist mandate. Can generalists find a niche in the current health care marketplace? How will the under-65 population influence the future of primary care practice? (The author predicts a scenario based on patients' degrees of affluence.) Will consumers be willing to pay for the services that primary care is uniquely well positioned to offer? The author explains why increasingly important issues of cost, quality, and convenience could help create a niche for primary care. He also maintains that academic medicine must rededicate itself to producing well-trained generalists, despite all the pressures not to, and discusses the challenges that family practice, internal medicine, and pediatrics must face if they are to flourish. He concludes that if generalism fails the market test, something very precious will be lost-and that generalist physicians would be so badly missed that they might have to be reinvented.

Humans↗

Performance parameters for screening and diagnostic mammography in a community practice: are there differences between specialists and general radiologists?

OBJECTIVE: The purpose of this study was to compare the performance of general radiologists in interpretation of mammograms with that of breast imaging specialists in a high-volume community hospital-based private practice. MATERIALS AND METHODS: A retrospective observational study was conducted with data prospectively collected over a 5-year period in a community hospital-based practice in which 106,405 screening and 52,149 diagnostic mammograms were performed. The performance of three radiologists specializing in breast imaging was compared with that of six general radiologists. The following data were extracted and analyzed: recall rate, biopsy recommendation rate, and cancer detection rate. Statistical analysis was performed with a chi-square test and two-tailed calculation of p values. RESULTS: The recall rates of the specialists and generalists were nearly the same at 6.5% and 6.7%, respectively. The biopsy recommendation rate at recall from screening examinations was nearly the same for generalists and specialists (1.2% and 1.1%, respectively; p = 0.4504). This rate also was similar for diagnostic examinations (8.5% for generalists; 8.4% for specialists; p = 0.4086). The cancer detection rate in the screening setting was slightly higher for specialists than for generalists: 2.5 and 2.0 cancers per 1,000 cases, respectively (p = 0.0614). The cancer detection rate in the diagnostic setting was 24.2% higher among specialists (20.0 cancers per 1,000 cases) compared with generalists (16.1 cancers per 1,000 cases) (p = 0.0177). CONCLUSION: The only statistically significant difference between generalists and specialists was in cancer detection rate among patients undergoing diagnostic mammography. No statistically significant difference was identified between the two groups in terms of recall rate, biopsy recommendation rate, or percentage of favorable-prognosis cases of cancer detected. There was a trend toward greater cancer detection by specialists in the screening setting.

Breast Neoplasms↗

Mississippi's physician labor force: current status and future challenges.

The literature review indicates that changes in Medicaid/Medicare reimbursement, large numbers of uninsured patients, the legal climate, and largely rural and chronically ill populations create a challenging environment for physicians practicing in Mississippi. As a largely rural state, many Mississippians find medical care to be physically distant, with most care being concentrated in a couple areas of the state. Given these factors, the legal climate in Mississippi and the top relocation decision factors, Mississippi will be further challenged in recruiting and retaining the numbers of general practitioners and specialists necessary to provide care to the state's population. The challenges that physicians are facing have led to challenges for health policy makers, in that physicians are difficult to recruit to Mississippi and, once here, difficult to retain as practitioners throughout their career. Four datasets were used in conjunction to analyze the demographic characteristics of Mississippi's physicians, including the age structure disaggregated by several other variables. Ultimately, the results were extended to impacts of recruitment, relocations, and retirement decisions of physicians who participated in the MSMDS. Briefly, demographic results indicate that Mississippi has a largely white physician population serving a nearly 40% minority population in Mississippi. The under representation of women within the medical profession in Mississippi means that women in the state might find it unusually challenging to find a female physician, particularly in rural areas where access to physicians is more limited in the first place. Mississippi has a high concentration of African-American patients with a low African-American physician presence. The proportion of physicians who are female is on the rise nationwide and within Mississippi, largely due to increasing enrollments of women in medical schools. Though variations exist within the groups of physicians identified as generalists, Mississippi is only slightly more likely than the nation to have specialists, rather than generalists (see Table Seven). Age structure analysis indicates that Delta physicians are older than physicians elsewhere in the state, that urban physicians are younger than rural physicians, and that our physician labor force is more highly concentrated between the ages of 35 and 54 than in the nation as a whole. Analyses concerning the future of the physician labor force indicate that a near majority of Mississippi's practicing physicians received their MD degree at UMC, but younger physicians are more likely to have been educated out-of-state than older physicians. Those who received their degrees elsewhere and chose to practice in Mississippi are more likely to be specialists (60%) than generalists (40%). Those physicians practicing in the state who were educated in-state are nearly equally as likely to be generalists (47%) as they are to be specialists (53%). Additionally, those approaching retirement are more likely to be generalists, yet the state is recruiting more generalists from recent medical school classes than in the past. Variations in intentions to recruit, relocate, and retire exist. However, most of the substantively important variation is across age groups and time in practice. There is little relevance of specialty or location within the state when examining variation in recruitment, relocation or retirement plans. Given the findings, policy research recommendations focus on improving the retention of UMC's graduates for practice in the state, improving retention of active physicians, increasing the recruitment of physicians from out of state, and easing difficulties associated with working part-time as a step toward retirement. With these changes in policy, it is possible that Mississippi can thwart a physician workforce shortage; however, without changes, with more physicians relocating, retiring early, or opting out of practicing in the state, the extant physician shortage will become more severe. Furthermore, without the data collection efforts mentioned here, there will be no means to assess whether policy changes are actually impacting the physician labor force.

Adult↗

[Procedures and technical aptitude of primary care physicians: which practice?].

PROBLEM: There is little knowledge of the practices of private physicians in Switzerland. However, this knowledge is a prerequisite for definition of the learning objectives in post-graduate and continuous education. OBJECTIVE: To ascertain the procedural skills of family physicians and general internists and compare them with variables such as education and the location of practice. METHOD: Questionnaire containing 68 procedural skills sent to all family physicians and general internists in the Cantons of Valais (VS) and Geneva (GE). RESULTS: 142/204 questionnaires (69%) were analyzed. A mean of 28.7 skills are practiced by the physicians. The internists use fewer procedures than the generalists. There is no difference between generalists practising in VS and GE, nor between location of the practice (urban or rural). The internists in GE and/or those practising in urban settings use fewer procedures than those practising in VS and in rural locations. Internists practising in rural setting use the same number of procedures than the generalists. Fifteen procedures are used by > or = 75% of physicians, 6 of these concern X-ray procedures. 60% of the procedures are used more frequently by the generalists, in particular surgical, ENT and gynecological procedures. There is no difference between generalists and internists as far emergency procedures or procedures in the cardiological and pneumological domain are concerned. CONCLUSIONS: The number of procedures depends nor only on the speciality of the private physician (generalist or general internist), but also and mainly on the location of the practice, the density of physicians and emergency practice. These findings can be used in defining the learning objectives of the primary care curriculum.

Clinical Competence↗

After-hours telephone calls to general and subspecialty internists: an observational study.

OBJECTIVE: To study the after-hours telephone calls received by practicing general and subspecialty internists. DESIGN: Observational study. SETTING: Forty-four internal medicine private practices in Long Island, New York, consisting of 70 physicians (31 general internists, 39 internists with subspecialty training). PATIENTS/PARTICIPANTS: All calls received by an answering service after office hours with the caller requesting to speak to one of the physicians in the study. Of the 8,444 total calls, 2,950 were to generalists and 5,494 were to subspecialists. MEASUREMENTS AND MAIN RESULTS: For both groups, most calls came from patients (46.3%), followed by physicians (26.0%), then hospitals (22.2%). For patient calls to the generalists, those concerning infectious disease (15.4%), nonspecific symptoms (11.1%), medication-related questions (9.7%), and gastrointestinal (GI) complaints (9.4%) were the most common. For those calls to the specialists, GI (14.2%), infectious disease (10.9%), medication-related (10.0%), and nonspecific symptom (9.0%) complaints represented the most common patient calls. Although GI and cardiology specialists received proportionally more patient calls related to their specialities, the specialty group, like the generalist group, received calls in all the major areas of internal medicine. Patient calls for problems well outside the traditional scope of internal medicine accounted for 2.9% of the calls to the generalists and 1.9% of the calls to the specialists. About 44% of the patient calls to both groups were for potentially serious problems. After 11:00 PM both groups saw a decrease in the proportions of minor and trivial calls. CONCLUSIONS: These observations support the concept of broadly based medical training for both internal medicine generalists and subspecialist in preparation for the variety of telephone calls they will deal with after office hours. Practitioners should take steps to reduce the high number of medication-related patient calls.

Humans↗

Physician manpower reform: an analysis of the effects of the COGME Fourth Report on internal medicine residency positions. Council on Graduate Medical Education.

PURPOSE: To quantitate the impact of the recommendations contained in the Council on Graduate Medical Education (COGME) Fourth Report on the position distribution in internal medicine residency and fellowship programs and to recommend alternative position allocations for discussion. DATA SOURCES: The COGME Fourth Report, the National Study of Internal Medicine Manpower, and the American Medical Association Annual Survey of Graduate Medical Education. RESULTS: Our analysis of the COGME Fourth Report indicates that internal medicine PGY-1 positions would decrease from the 8,936 on duty in the 1992 academic year to 6,533 (-26.9%) for the class of the year 2000. Four thousand will enter generalist careers in internal medicine (approximately a 70% increase over current generalist output). The COGME Fourth Report recommendations would allocate first-year fellowship positions for 1,400 graduates of internal medicine residencies (-63.1%). Career-bound internal medicine positions will decrease from approximately 6,000 to 5,400 (-10.0%). The loss in PGY-1 positions is predominantly due to a decrease in the number of preliminary medicine positions and to individuals who switch from career-bound internal medicine positions to other disciplines after the PGY-1 or PGY-2 years. Pediatric positions would increase moderately from 2,426 available in 1993 to 2,520 (+3.9%). Pediatric subspecialty positions would decrease by 25% to 420, with 2,100 residents entering careers in general pediatrics. Family medicine PGY-1 positions would increase from the 2,657 available in 1993 to 3,400 (+28%). CONCLUSIONS: The recommendations contained in the COGME Fourth Report would substantially reduce the number, and significantly alter the current distribution, of residency positions. The output goals of 50% generalist careers are met by an increase in career-bound generalist positions in all three generalist specialties. The limitation of total positions to the goal of 110% of 1993 U.S. graduates comes predominantly through reduction of specialty/subspecialty career-bound positions. Internal medicine residency and subspecialty fellowship positions and programs would be significantly altered by these recommendations. The reductions in internal medicine occur predominantly in loss of positions not currently destined for careers in internal medicine and in subspecialty fellowship positions. These reductions are partially offset by an increase in the complement of residents who are destined for careers in general internal medicine.

Education, Medical, Graduate↗

Pathogen spillover in disease epidemics.

In field experiments manipulating generalist pathogens and host community composition, the presence of a highly susceptible reservoir species drove disease dynamics in multiple nonreservoir species, sometimes decreasing their abundance through apparent competition. The dynamics of generalist pathogens in multispecies host communities remain a major frontier for disease ecology. Of particular interest are how host community structure controls pathogen transmission and how disease spread feeds back to influence the host community. Pathogen spillover occurs when epidemics in a host population are driven not by transmission within that population but by transmission from a reservoir population. Here we review examples of spillover in pathogens infecting humans, domesticated animals, and crops, noting that most empirical evidence for spillover results from nonmanipulative, observational studies. We then present results from two field experiments utilizing an experimentally tractable model system of annual wild grasses and a generalist virus, the barley yellow dwarf virus. In these experiments, the presence of a highly susceptible reservoir species, Avena fatua (wild oats), greatly increased pathogen prevalence in several other species. This result demonstrates pathogen spillover and illustrates the crucial role of host community structure in controlling the dynamics of generalist pathogens. Further, pathogen spillover from A. fatua decreased the abundance of two other host species through pathogen-mediated apparent competition. Thus, our results provide experimental support for theoretical predictions of strong feedbacks between host community structure and generalist disease dynamics.

Animals↗

Physician use of disease management programs.

This paper examines differences in availability, use, and perceived usefulness of disease management programs as reported by generalist and specialist physicians functioning as primary care providers in health plans. Implications of these differences are discussed in terms of the three types of purchasers: private insurers, Medicare, and Medicaid. The design is a cross-sectional mail and telephone mixed-mode survey. The data come from 23 health plans in five states (Florida, New York, Colorado, Pennsylvania, and Washington), including six metropolitan areas: Seattle, New York City, Miami, Pittsburgh, Philadelphia, and Denver. The study participants are 1,244 generalist and specialist physicians who contracted with health plans as primary care providers. They were drawn from a 2001 mail and telephone survey of 2,105 generalist and 1,693 specialist physicians serving commercial, Medicaid, and Medicare patients. Physician responses about use of disease management for their patients in the health plan and how useful they thought it was were regressed on physician, physician organization, and physician-health plan relationship characteristics. While generalist physicians are likely to report having disease management programs available and using them, specialists vary greatly in their response to the disease management programs. In contrast to physicians associated with commercial plans, implementation of disease management programs among physicians associated with Medicaid plans varied across states. Primary care providers trained in generalist areas of practice are more likely than specialists functioning as primary care providers to report that disease management programs are available and to use them. They also find them more useful than do specialists.

Female↗