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Current status of food-borne parasitic zoonoses in the United States.

Although not a major public health problem, food-borne parasitic zoonoses in the United States are the cause of numerous diseases that occur widely in the population. The most common food-borne parasitic diseases in the United States are trichinosis, toxoplasmosis, taeniasis/cysticercosis, diphyllobothriasis, and anisakiasis. Since 1947, when the US Public Health Service began to record statistics on trichinosis cases in humans, the numbers of reported cases in the United States have declined markedly, from an average of about 400 with 10-15 deaths reported each year in the late 1940s, to an average of 57 per year with three deaths overall in the 5 years 1982-1986. Each year throughout the world, Toxoplasma gondii infects millions of persons, who contract it either by eating raw or poorly cooked meat from infected animals such as hogs or sheep or by ingesting soil contaminated with cat feces. In the United States between 400 and 10,000 infants are born each year with congenital toxoplasmosis. Toxoplasmic encephalitis, marked by dementia and seizures, has become the most commonly recognized cause of central nervous system opportunistic infection in AIDS patients. Intestinal taeniid tapeworm infection acquired in the United States is almost entirely caused by Taenia saginata, the beef tapeworm. Neurocysticercosis, caused by larvae of the pork tapeworm Taenia solium, is diagnosed in hundreds of persons in the United States every year. Nearly all patients are immigrants or travelers from Mexico and other disease-endemic areas. Diphyllobothriasis and anisakiasis both have increased in recent years in association with increasing popularity of raw fish dishes. Adequate prevention and control of food-borne parasitic zoonoses require continued and improved programs to educate consumers, producers and medical practitioners.

Animals↗

Sustained elimination of hepatitis B virus from serum induced in a patient with chronic hepatitis B and advanced human immunodeficiency virus infection.

A 48-year-old male patient was admitted with acquired immunodeficiency syndrome (stage III, Centers for Disease Control 1993) and viremic hepatitis B. Blood CD4 count was 15/microliters. Discontinuation of prednisolone, previously prescribed by the patient's family practitioner because of elevated liver enzymes, resulted in severe hepatitis (alanine aminotransferase > 300U/l). Administration of interferon-alpha (9 x 10(6) U s.c. 3 x weekly) was initiated. Serum markers of viral replication disappeared, and aminotransferase levels returned to normal within a few weeks. The patient's serum was found negative for HBsAg after 3 months. Immunohistochemical analysis of liver biopsies before and during interferon therapy showed disappearance of all hepatitis B virus antigens and a marked reduction in inflammatory activity. Hepatitis B virus seroconversion remained stable until the patient died from the syndrome 2 years later. This case shows that in spite of severe HIV-associated immune deficiency with CD4 counts constantly below 100/microliters, interferon-alpha can lead to sustained serological and histological improvement of viremic hepatitis B. Previous administration and discontinuation of cortisone may have helped to reach this effect.

AIDS-Related Opportunistic Infections↗

Politics and poker--two game plans shape up in AIDS-control strategy.

A line from the song 'Politics and Poker,' from the Broadway musical Fiorello, goes: 'Neither game's for children, either game is rough. Decisions, decisions, like who to pick, how to bet, how to play, how to call a bluff.' Events in recent months, leading up to and following the release of CCD's recommendations for preventing transmission of HIV to patients by health care workers, can be characterized as a nation playing both games in trying to deal with undefinable or unexplainable risks of AIDS transmission. The nation seems split between those who favor politically astute (though not necessarily logically or ethically sound) solutions, and those who believe that HIV-infected practitioners must make decisions on testing, disclosure, and changes in practice based on a rational assessment of each individual case--factoring in the odds of viral transmission, the chance of losing a career, the interpretation of risk, adherence to stringent infection control technique, timing, patient confidence, and peer support. Ether one is a gamble. This special issue of Hospital Ethics takes a look at the politics and poker of AIDS testing and disclosure, with special attention to the kinds of advice being offered to hospitals as they develop policies on infected health care workers.

AIDS Serodiagnosis↗

Management of severe sepsis: integration of multiple pharmacologic interventions.

Severe sepsis is an infection-induced process that often promotes organ dysfunction and death in up to 50% of afflicted patients. Clinical advances that improve patient survival include early goal-directed volume resuscitation, broad-spectrum empiric antimicrobial therapy with deescalation strategies, therapy with drotrecogin alfa (activated), glucocorticoid replacement in patients with adrenal insufficiency, and tight control of blood glucose levels. The challenge for critical care practitioners is to integrate the many pharmacologic and supportive interventions required for optimal care of these patients.

Animals↗

Identifying and treating common and uncommon infections in the patient with diabetes.

Patients with diabetes represent a unique group of individuals who appear more prone than others to developing infections. Several mechanisms have been proposed to explain the association between diabetes and infections. However, few conclusive studies exist and considerable debate continues regarding evidence for this predisposition. Despite this lack of documented proof, many health care practitioners acknowledge that a number of infections are overrepresented in patients with diabetes. Some of these infections appear to occur exclusively in patients with diabetes, especially patients who are poorly controlled. The presenting clinical features, causative organisms, and preferred treatment approaches will be discussed in this article for a variety of common and uncommon infections observed in patients with diabetes. In addition, the proposed predisposing factors will be addressed briefly.

Cellulitis↗

Management of children with acute respiratory infections (ARI) by general practitioners in Multan - an observational study.

A knowledge, attitude and practices (K.A.P.) survey was conducted among doctors working as general practitioners (GP) in Multan, for diagnosis and management of acute respiratory infections (ARI) in children under five years of age. GPs in Multan were not familiar with national ARI control programme and rational drug use guidelines. They rarely asked about symptoms describing severity of disease while taking patient histories and did not look for signs of severe pneumonia during physical examinations. Most patients diagnosed as URTI (upper respiratory tract infection) received oral antibiotics and those with pneumonia received injectable antibiotics. Other drugs prescribed included cough syrups, antihistamines and antipyretics. The average number of drugs prescribed per patient was 3.4. The doctors were deficient in providing home care advice for sick children to the caretakers. Average time spent by doctors on each patient was two minutes and twenty-three seconds. A combination of biomedical and social factors help to perpetuate this irrational prescribing behaviour of the GPs. Continuing education programmes for doctors in general practice about ARI management in children and rational use of drugs and health education of the public may improve the current prescribing practices.

Acute Disease↗

Risks for and prevention of infective endocarditis.

It is accepted medical practice to prevent bacterial endocarditis in patients with susceptible congenital or acquired cardiac malformations who are likely to experience predictable procedure-related bacteremia. Patients in general, those with congenital heart disease specifically, are insufficiently aware of the need for such prophylaxis. It is responsibility of the physician to determine which patients are susceptible to endocarditis and the need for endocarditis prophylaxis for each patient for any given instance and to educate the patient as to this need. The American Heart Association provides wallet-sized cards that may be given to each patient. Those patients not previously known to have heart disease are, of course, not eligible for chemoprophylaxis. Because these represent many of the patients with endocarditis each year, it can be argued that only a minority of patients have preventable cases. Regarding the clinical application of anti-infective endocarditis prophylaxis, the American Heart Association gives this perspective: This statement represents recommended guidelines to supplement practitioners in the exercise of their clinical judgement and is not intended as a standard of care for all cases.... Because no adequate, controlled clinical trials of antibiotic regimens for the prevention of bacteria endocarditis in humans have been done, recommendations are based on vitro studies, clinical experience, data from experimental animal models, and assessment of both the bacteria most likely to produce bacteremia from a given site and those most likely to result in endocarditis. Bacterial endocarditis is one of the few infectious disease that almost always result in death unless treated. The dramatic nature of the morbidity and mortality of infective endocarditis in those so afflicted makes the prevention of even a few cases worth the effort.

Animals↗

[Contact tracing in genital chlamydia infections].

Only one in five general practitioners in Norway initiates notification of partner(s) after diagnosing a case of genital chlamydial infection. In order to increase the use of this efficient case-finding method we review the aims of notifying partners and the judicial, ethical and economical aspects of the method. We describe both provider-referral and patient-referral methods. The first approach is chosen when the index patient wants to remain anonymous. General practitioners are advised not to give the index patient medication for the contacts. Instead, the contacts should be examined and informed by qualified personnel. Notification of partner will be a cornerstone in the struggle to control the current epidemic of genital chlamydial infection in Norway.

Chlamydia Infections↗

A controlled trial of the use of dip slides in general practice for the diagnosis of urinary infection.

A controlled trial of the use and interpretation of dip-inoculation slides for the diagnosis of urinary infection in four general practices is reported. Two slides were inoculated from each specimen, one being incubated and read in the surgery by the practitioner, the other being sent to the laboratory for incubation and interpretation. It is shown that the presence or absence of bacteriuria can be detected with a high degree of accuracy by a surgery procedure. The implications for the laboratory, the patient, and the practitioner are discussed. It is suggested that the financial saving on laboratory time and unnecessary treatment would far outweigh the outlay on apparatus and materials, and that many patients would benefit from the accurate diagnosis of urinary infection which, for a variety of reasons, is at present denied them.

Bacteriological Techniques↗

Antibody to Coxsackie B virus in diagnosing postviral fatigue syndrome.

OBJECTIVE: To study the association between coxsackie B virus infection and the postviral fatigue syndrome and to assess the immunological abnormalities associated with the syndrome. DESIGN: Case-control study of patients with the postviral fatigue syndrome referred by local general practitioners over one year. SETTING: General practitioner referrals in Dunbartonshire, Scotland. PATIENTS: 254 Patients referred with the postviral fatigue syndrome (exhaustion, myalgia, and other symptoms referable to postviral fatigue syndrome of fairly recent onset--that is, several months) and age and sex matched controls obtained from same general practitioner; 11 patients were rejected because of wrong diagnoses, resolution of symptoms, and refusal to participate, leaving 243 patients and matched controls. MAIN OUTCOME MEASURES: Detailed questionnaire (patients and controls) and clinical examination (patients) and blind analysis of blood sample at entry and after six months for determination of coxsackie B virus IgM and IgG antibodies and other variables (including lymphocyte protein synthesis, lymphocyte subsets, and immune complexes). RESULTS: Percentage positive rates for coxsackie B virus IgM at entry were 24.4% for patients and 22.6% for controls and for coxsackie B virus IgG 56.2% and 55.3% respectively; there were no significant differences between different categories of patients according to clinical likelihood of the syndrome nor any predictive value in a fourfold rise or fall in the coxsackie B virus IgG titre in patients between entry and review at six months. The rates of positive antibody test results in patients and controls showed a strong seasonal variation. Of the numerous immunological tests performed, only a few detected significant abnormalities; in particular the mean value for immune complex concentration was much higher in 35 patients and 35 controls compared with the normal range and mean value for total IgM was also raised in 227 patients and 35 controls compared with the normal range. CONCLUSIONS: Serological tests available for detecting coxsackie B virus antibodies do not help diagnose the postviral fatigue syndrome. Percentage positive rates of the antibodies in patients simply reflect the background in the population as probably do the raised concentrations of total IgM and immune complexes.

Adult↗

[Detection of a pathological cutaneous reaction to tuberculin in an adolescent].

The diagnosis of tuberculosis infection is based on a pathological dermal induration (positive Mantoux reaction) after injection of a standard dose of tuberculin (2 U). The positivity criteria of the Mantoux reaction vary according to whether the adolescent was or was not given BCG vaccination in the past. If the intradermal reaction is pathological at the time of the school screening visit, the subject should be referred to his physician, who will perform a second test (control Mantoux). If the pathological reaction is not confirmed, no further investigations will be needed. If the positive Mantoux is confirmed, the practitioner performs a detailed physical examination and a chest X-ray. If there is no abnormality, a natural tuberculosis infection is diagnosed and 6-month preventive monotherapy prescribed. If the chest picture is abnormal, further investigations will be required and, according to the results, preventive treatment or polychemotherapy for tuberculosis disease will be administered.

Adolescent↗

A short educational intervention on communication skills improves the quality of screening for Chlamydia in GPs in Belgium: a cluster randomised controlled trial.

An accurate algorithm for screening for chlamydial infections is available in general practice, but GPs experience numerous barriers to sexually transmitted infections (STI) counselling. In this study we assessed if a short educational package, under the form of a commented video footage on communication skills, was helpful in implementing the screening strategy. A cluster randomised controlled trial was carried out in 36 general practitioners in Antwerp, Belgium. Main outcome measures were: number of patients included in the risk assessment, number of patients tested, and proportion of appropriately tested patients. The results show that GPs in the intervention group did not include more patients overall, but that the quality of the screening process was significantly better (81.6% versus 56.2% appropriate tests, P = 0.02). Conclusively, GPs who participated in a short educational package on communication skills, selected eligible candidates for screening more accurately and decreased the risk of overscreening.

Adult↗

Diminishing racial disparities in early-onset neonatal group B streptococcal disease--United States, 2000-2003.

Increased use of intrapartum antibiotics to prevent perinatal group B streptococcal (GBS) disease during the 1990s led to substantial declines in the incidence of GBS disease in newborns. Despite this success, at the end of the 1990s, early-onset GBS disease (in infants aged <7 days) continued to be a leading infectious cause of neonatal mortality in the United States, and black infants remained at higher risk than white infants. In 2002, CDC and the American College of Obstetricians and Gynecologists (ACOG) revised guidelines for prevention of early-onset GBS disease to recommend late prenatal screening of all pregnant women and intrapartum antibiotic prophylaxis (IAP) for GBS carriers. These guidelines were expected to result in further declines in early-onset disease. This report updates early-onset incidence trends since 1999 analyzed by using population-based, multistate data from the Active Bacterial Core surveillance (ABCs)/Emerging Infections Program Network. The results of the analysis indicated that 1) after a plateau in early-onset disease incidence during 1999-2002, rates declined 34% in 2003 and 2) although racial disparities in incidence persist, rates for blacks now approach the 2010 national health objective of 0.5 cases per 1,000 live births. Continued implementation of screening and prophylaxis guidelines by clinicians and public health practitioners should lead to further declines in racial disparities.

Health Services Accessibility↗

Changing GPs' antibiotic prescribing: a randomised controlled trial.

A randomised controlled trial involving 54 general practitioners (GPs) was conducted in Canberra, Australian Capital Territory from September 1997 to November 1999. In the first year of the study, 24 GPs, who constituted the active arm of the intervention group, were involved in the consideration of evidence and the development and implementation of a set of clinical guidelines for the treatment of acute respiratory infections. These guidelines were then endorsed in a meeting together with specialist colleagues. In the second year of the study the group of GPs who had been acting as controls, received a moderate intervention consisting of a brief educational event and distribution of the locally developed guidelines. We obtained data from January 1997 to December 1999 from the Health Insurance Commission on prescribing rates for 40 of the doctors in the study. The rate of prescribing was calculated as the number of antibiotic prescriptions per 100 Medicare services. The average yearly prescribing decreased significantly in the intensive intervention group and increased in the moderate intervention group, (p=0.026). A mixed effects longitudinal time series model was fitted to the data to account for seasonal variation of antibiotic prescribing and trends over time. The intensive intervention group significantly reduced their antibiotic prescribing over time compared to the moderate intervention group, (p<0.001). This study has shown that an intensive intervention in which general practitioners were actively engaged in development and consideration of the evidence base for the guidelines resulted in a significant fall in general antibiotic prescribing.

Adult↗

Nonsurgical periodontal therapy.

Regular home care by the patient in addition to professional removal of subgingival plaque is generally very effective in controlling most inflammatory periodontal diseases. When disease does recur, despite frequent recall, it can usually be attributed to lack of sufficient supragingival and subgingival plaque control or to other risk factors that influence host response, such as diabetes or smoking. Causative factors contributing to recurrent disease include deep inaccessible pockets, overhangs, poor crown margins and plaque-retentive calculus. In most cases, simply performing a thorough periodontal debridement under local anesthesia will stop disease progression and result in improvement in the clinical signs and symptoms of active disease. If however, clinical signs of disease activity persist following thorough mechanical therapy, such as increased pocket depths, loss of attachment and bleeding on probing, other pharmacotherapeutic therapies should be considered. Augmenting scaling and root planing or maintenance visits with adjunctive chemotherapeutic agents for controlling plaque and gingivitis could be as simple as placing the patient on an antimicrobial mouthrinse and/or toothpaste with agents such as fluorides, chlorhexidine or triclosan, to name a few. Since supragingival plaque reappears within hours or days after its removal, it is important that patients have access to effective alternative chemotherapeutic products that could help them achieve adequate supragingival plaque control. Recent studies, for example, have documented the positive effect of triclosan toothpaste on the long-term maintenance of both gingivitis and periodontitis patients. Daily irrigation with a powered irrigation device, with or without an antimicrobial agent, is also useful for decreasing the inflammation associated with gingivitis and periodontitis. Clinically significant changes in probing depths and attachment levels are not usually expected with irrigation alone. Recent reports, however, would indicate that, when daily irrigation with water was added to a regular oral hygiene home regimen, a significant reduction in probing depth, bleeding on probing and Gingival Index was observed. A significant reduction in cytokine levels (interleukin-1beta and prostaglandin E2, which are associated with destructive changes in inflamed tissues and bone resorption also occurs. If patient-applied antimicrobial therapy is insufficient in preventing, arresting, or reversing the disease progression, then professionally applied antimicrobial agents should be considered including sustained local drug delivery products. Other, more broadly based pharmacotherapeutic agents may be indicated for multiple failing sites. Such agents would include systemic antibiotics or host modulating drugs used in conjunction with periodontal debridement. More aggressive types of juvenile periodontitis or severe rapidly advancing adult periodontitis usually require a combination of surgical intervention in conjunction with systemic antibiotics and generally are not controlled with nonsurgical anti-infective therapy alone. It should be noted, however, that, to date, no home care products or devices currently available can completely control or eliminate the pathogenic plaques associated with periodontal diseases for extended periods of time. Daily home care and frequent recall are still paramount for long-term success. Nonsurgical therapy remains the cornerstone of periodontal treatment. Attention to detail, patient compliance and proper selection of adjunctive antimicrobial agents for sustained plaque control are important elements in achieving successful long-term results. Frequent re-evaluation and careful monitoring allows the practitioner the opportunity to intervene early in the disease state, to reverse or arrest the progression of periodontal disease with meticulous nonsurgical anti-infective therapy.

Administration, Oral↗

Improvements in cross-infection control in general dental practice.

A questionnaire about cross-infection control was sent to all GDPs in five FHSAs in the North Western Region. Replies came from 312 dentists, a response rate of 74%. They worked in 185 practices, a response rate of 85%. Gloves were worn routinely by 86% of dentists and 80% of DSAs. Handpieces were autoclaved between patients in 77% of practices. Much however, remains to be improved. DSAs could be better protected if more ultrasonic cleaners were used, eye protection encouraged and heavy duty gloves were available for cleaning instruments. BDA guidelines were reported as being the most influential factor, though it would appear that the media did persuade many practitioners to use autoclavable handpieces and sterilise them after each use.

Dental Equipment↗

Antibiotics / anti-inflammatories for reducing acute inflammatory episodes in lymphoedema of the limbs.

BACKGROUND: Lymphoedema is a chronic and progressive condition and current debate revolves around the best course of management for infective/inflammatory episodes. OBJECTIVES: To determine whether antibiotic/anti-inflammatory drugs given prophylactically reduce the number and severity of infective/inflammatory episodes in patients with lymphoedema. SEARCH STRATEGY: We searched the Cochrane Breast Cancer Group register in September 2003, the Cochrane Central Register of Controlled Trials (The Cochrane Library, Issue 4, 2003), CINAHL, MEDLINE, PASCAL, SIGLE, UnCover, reference lists produced by The British Lymphology Society, the National Research Register (NRR) and the International Society of Lymphology congress proceedings. SELECTION CRITERIA: Types of studies considered for review were randomised controlled trials testing an antibiotic or anti-inflammatory drug against placebo (with or without physical therapies). DATA COLLECTION AND ANALYSIS: Eligibility for inclusion was confirmed by two blinded reviewers who screened the papers independently using a checklist of criteria relating to the randomisation and blinding of a trial. Both reviewers extracted data from the eligible studies using a data extraction form. MAIN RESULTS: Overall, four studies (364 randomised patients) were included. Two of these studied the effects of intensive physical treatment plus selenium or placebo in preventing AIE, and two studied the effects of Ivermectin, Diethylcarbamazine (DEC) (anti-filarial agents) and penicillin as prophylactic treatment for adeno lymphangitis(ADL) versus placebo. Both selenium trials reported no inflammatory episodes during the trial period in the treated group but one case of infection in the two placebo groups respectively during the first three weeks of each trial. Seven additional cases of infection in trial one and 14 cases in trial two required treatment in the three month follow up period. One anti filarial trial reported a total of 127 ADL episodes for all groups during the treatment year (compared with 684 episodes reported for the same participants during the pre-treatment year). Another 228 ADL episodes were reported during the trial follow-up year but no significant differences were found between the three groups. No apparent link was found between the grade of oedema and the frequency of ADL episodes. However, there was a significant link between increased episodes and the rainy season. In the penicillin group the mean number of inflammatory episodes was reduced from 4.6 to 0.5 after treatment and increased to 1.9 at the end of the follow-up year. REVIEWERS' CONCLUSIONS: The effectiveness of selenium in preventing AIE in lymphoedema remains inconclusive in the absence of properly conducted randomised controlled trials. Anti-filarials (DEC and Ivermectin) do not appear to reduce ADL episodes in filarial lymphoedema. Foot care may be important in reducing ADL episodes, and penicillin appears to contribute to a significant reduction in ADL, when combined with foot-care. It seems reasonable to emphasise the importance of foot-care to patients and practitioners in preventing infection and this may also apply to care of the arm in women who develop lymphoedema following breast cancer treatment. However, properly conducted trials are needed to demonstrate any efficacy of these interventions.

Anti-Bacterial Agents↗