Search PubMed⌕ Search

Biomedical subjects

Sten H Vermund

Publications and source records attributed to Sten H Vermund.

At least 37 records · Page 2Linked to original sources

Haematological response to iron supplementation is reduced in children with asymptomatic Helicobacter pylori infection.

We evaluated the adverse effect of asymptomatic Helicobacter pylori infection in children on the response to Fe supplementation. One hundred and sixty-nine children aged 1-10 years from the urban poor community underwent a [13C]urea breath test for H. pylori and haematological tests at admission and after 8 weeks. Both H. pylori-positive and -negative children were randomly assigned to receive ferrous fumarate syrup (20 mg elemental Fe twice daily) or placebo for 8 weeks and a single dose of vitamin A (33,000 microg). Admission findings were compared between H. pylori-positive and -negative children. Response to Fe was compared between Fe-supplemented H. pylori-positive and -negative children. Seventy-nine per cent of the children were aged 1-5 years and half of them were boys. In eighty-five H. pylori-positive and eighty-four H. pylori-negative children, the differences in mean Hb (112 (sd 12.6) v. 113 (sd 12.0) g/l), haematocrit (34 (sd 3.5) v. 35 (sd 3.2) %) and ferritin (23.8 v. 21.0 microg/l) were similar. After 8 weeks of Fe supplementation, mean Hb was 5.3 g/l more (95 % CI 1.59, 9.0) and haematocrit was 1.4 % more (95 % CI 0.2, 2.6) in H. pylori-negative (n 44) compared with H. pylori-positive (n 42) children. Mean ferritin was similar at admission and improved in both H. pylori-positive and -negative children. Asymptomatic H. pylori infection was not associated with higher rates of anaemia or Fe deficiency in children, but had a significant adverse effect on response to Fe therapy. However, this result is based on exploratory analysis and needs confirmation.

Anemia↗

An intervention to reduce vaginal douching among adolescent and young adult women: a randomized, controlled trial.

OBJECTIVE: The objective of this study was to evaluate an intervention to reduce vaginal douching among adolescent and young women who report douching. STUDY: This study consisted of a randomized, controlled trial of 275 primarily black adolescent and young adults aged 14 to 23 years. All women participated in 3 15-minute individualized counseling sessions. The experimental group received interventions based on their stage of readiness for ceasing vaginal douching. The comparison condition emphasized healthy eating and nutrition. The primary outcome measure was douching cessation (i.e., no douching in the preceding 3 months) at the 6-and 12-month assessment; a secondary outcome was progression through the stages of change toward douching cessation. RESULTS: Based on an intention-to-treat model, participants assigned to the douching intervention group were significantly more likely to report having stopped douching at 6 months (relative risk [RR], 1.34; 95% confidence interval [CI], 1.03-1.73) and at 12 months (RR, 1.60; 95% CI, 1.28-2.00). At baseline, 89.9% of all women reported no intention to stop douching. Also based on an intention-to-treat model, there were no differences in stage across the 2 groups at 6 months (P = 0.29); however, at 12 months, the difference between the intervention and comparison group was statistically significant (P = 0.008). CONCLUSION: Stage-matched interventions can reduce douching among adolescent and young adult women.

Adolescent↗

Prevalence and predictors of intestinal helminth infections among human immunodeficiency virus type 1-infected adults in an urban African setting.

Sub-Saharan Africa is disproportionately burdened by intestinal helminth and human immunodeficiency virus (HIV)-1 infection. Recent evidence suggests detrimental immunologic effects from concomitant infection with the two pathogens. Few studies, however, have assessed the prevalence of and predictors for intestinal helminth infection among HIV-1-infected adults in urban African settings where HIV infection rates are highest. We collected and analyzed sociodemographic and parasitologic data from 297 HIV-1-infected adults (mean age = 31.1 years, 69% female) living in Lusaka, Zambia to assess the prevalence and associated predictors of helminth infection. We found at least one type of intestinal helminth in 24.9% of HIV-infected adults. Thirty-nine (52.7%) were infected with Ascaris lumbricoides, and 29 (39.2%) were infected with hookworm. More than 80% were light-intensity infections. A recent visit to a rural area, food shortage, and prior history of helminth infection were significant predictors of current helminth status. The high helminth prevalence and potential for adverse interactions between helminths and HIV suggests that helminth diagnosis and treatment should be part of routine HIV care.

AIDS-Related Opportunistic Infections↗

Priorities for antiretroviral therapy research in sub-Saharan Africa: a 2002 consensus conference in Zambia.

BACKGROUND: A consensus conference was held to discuss priorities for antiretroviral therapy (ART) research in Zambia, one of the world's most heavily HIV-afflicted nations. Zambia, like other resource-limited settings, has increasing access to highly active antiretroviral therapy (HAART) because of declining drug costs, use of government-purchased generic medications, and increased global donations. For sustained delivery of care with HAART in a resource-constrained medical and public health context, operational research is required and clinical trials are desirable. The priority areas for research are most relevant today given the increasing availability of HAART. METHODS: A conference was held in Lusaka, Zambia, in January 2002 to discuss priority areas for ART research in Zambia, with participants drawn from a broad cross section of Zambian society. State-of-the-art reviews and 6 intensive small group discussions helped to formulate a suggested research agenda. RESULTS: Conference participants believed that the most urgent research priorities were to assess how therapeutic resources could be applied for the greatest overall benefit and to minimize the impact of nonadherence and viral resistance. Identified research priorities were as follows:Conference participants recommended that HIV-related clinical care and research be integrated within home-based care services and operated within the existing health delivery structures to ensure sustainability, reduce costs, and strengthen the structures. CONCLUSION: Our consensus was that antiretroviral clinical trials and operational research are essential for Zambia to address the new challenges arising from increasing ART availability. There is global consensus that antiretroviral clinical trials in resource-constrained countries are possible, and the capacity for such trials should be developed further in Africa.

AIDS-Related Opportunistic Infections↗

Universal nevirapine upon presentation in labor to prevent mother-to-child HIV transmission in high prevalence settings.

OBJECTIVE: To assess the uptake of and adherence to nevirapine to prevent mother-to-child HIV transmission among women of unknown HIV serostatus presenting in labor. We also assessed preliminary efficacy of the approach. DESIGN: Women of unknown HIV serostatus presenting in labor were offered single-dose nevirapine in a prospective cohort study. Two additional contemporaneous comparison populations were also studied. METHODS: We measured uptake by counting the number of women that accepted enrollment when offered. We measured adherence with cord blood nevirapine assay. We measured preliminary efficacy with HIV DNA polymerase chain reaction of infant blood spots at 4-6 weeks of life. RESULTS: Of 1591 women approached in labor, 634 (40%) took up the intervention and received nevirapine, of whom 185 (29%) were HIV infected. Of 179 cord blood specimens from HIV-exposed infants that could be evaluated, 178 (99.4%) had nevirapine detected. This was higher than the 73 of 98 (74%) adherence rate observed in a comparison cohort in which women self-administered nevirapine before presenting to the labor ward (P < 0.001). Of 145 available infant specimens, 17 (11.7%) showed evidence of infection at 4-6 weeks, compared with 12 of 60 (20%) infants born immediately prior to study commencement whose HIV-infected mothers did not receive nevirapine (P < 0.05). CONCLUSIONS: Nevirapine without HIV testing upon presentation in labor was accepted by two-fifths of women. Because therapy is directly observed, adherence is nearly perfect. Labor ward dosing to enhance nevirapine coverage should be considered as an adjunct to antenatal nevirapine administration for prevention of mother-to-child transmission of HIV.

Adult↗

Tolerance and safety of different concentrations of chlorhexidine for peripartum vaginal and infant washes: HIVNET 025.

BACKGROUND: There is a continuing need to evaluate sustainable interventions for prevention of mother-to-child transmission (MTCT) of HIV type 1. We evaluated different concentrations (0.25%, 1%, and 2%) of chlorhexidine (CHX) for perinatal maternal and infant washes to identify the maximum tolerable concentration of CHX for such an intervention. METHODS: Women were enrolled during their third trimester at the maternity unit of the Chris Hani Baragwanath Hospital in Soweto, South Africa, and perinatal maternal and infant washes were completed. Subjective maternal symptoms as well as infant examinations were used to assess tolerability of the washes. RESULTS: The 0.25% concentration of CHX was well tolerated by the mothers (n = 29). Ten of 79 women (13%) with 1% CHX washes complained of mild vaginal area burning or itching, and washes were stopped in 5 (6%). Twenty-three of 75 women (31%) in the 2% CHX wash group had subjective complaints, and the washes were stopped in 12 (16%). There were no clinical indications of toxicity of the CHX washes among infants. CONCLUSION: A 1% solution of CHX appears to be a safe and tolerable concentration of CHX for consideration in an MTCT prevention trial.

Acquired Immunodeficiency Syndrome↗

Personal risk perception, HIV knowledge and risk avoidance behavior, and their relationships to actual HIV serostatus in an urban African obstetric population.

One quarter of pregnant women in Zambia are infected with HIV. Understanding how knowledge of HIV relates to personal risk perception and avoidance of risky behaviors is critical to devising effective HIV prevention strategies. In conjunction with a large clinical trial in Lusaka, Zambia, we surveyed postpartum women who had been tested for HIV but did not know their status before undergoing the questionnaire. Of 858 women for whom complete data were available, 248 (29%) were HIV infected. Women 22 years of age or older (adjusted odds ratio [AOR], 1.7; 95% confidence interval [CI], 1.1-2.5), women reporting > or =2 sexual partners in their lifetime (AOR, 1.8; 95% CI, 1.3-2.5), and women reporting a history of a sexually transmitted infection (AOR, 2.7; 95% CI, 1.7-4.3) were more likely to be HIV infected. Having had > or =2 lifetime sexual partners was a marker for perception of high personnel risk for HIV infection (AOR, 1.5; 95% CI, 1.1-2.1). However, there was no relationship between perceived risk of HIV infection and actual HIV status. In fact, 127 (52%) of 245 women who stated that they were at no or low risk for HIV infection were HIV infected. Living in an area of high HIV seroprevalence like Zambia seems to be the greatest risk factor for infection in unselected pregnant women. Before significant inroads can be made in decreasing the incidence of HIV infection among pregnant women, population-based strategies that involve men must be implemented.

Adult↗

A comparison of three sources of data on child homicide.

This study compared data from death certificates (DC), medical examiner (ME) reports, and Uniform Crime Reporting (UCR) Program for homicides among children age 5 years or younger in Jefferson County, Alabama between 1988 and 1998. Records from each source were matched independently to records from the other two sources. Kappa coefficients measured the chance-corrected agreement between sources. The strongest correlations were for victim's gender and race. Correlations were weakest for victim's relationship to the offender and offender's gender. DC and ME data demonstrated excellent agreement and provided a comprehensive count of homicides in Jefferson County, whereas UCR comparisons had lower correlations. However, the UCR is a valuable source of child homicide data in the United States that is underutilized in public health research.

Alabama↗

Incidence and risk factors for sexually transmitted infections among women in an Alabama HIV clinic.

The objectives of this study were to assess the prevalence and incidence of curable sexually transmitted infections (STI), i.e., gonorrhea, chlamydial infection, or trichomoniasis, in a cohort of HIV-infected women. The study population was derived from women seeking primary care at an outpatient university HIV clinic who were participants in a women's natural history study. Enrollees (n = 225) were predominantly African-American, heterosexually infected, with mean age 35 years. Mean entry CD4+ T cell count was 405 cells/mm3. Over 6% were STI positive at initial screening. Subsequently, the combined curable STI incidence was 4.82/1000 woman-months over a median of 33 months of observation. Of 36 incident STIs, trichomoniasis was most common (n = 32). Predictors for acquisition of a curable STI included absenteeism at scheduled clinic appointments, RR = 1.99 (1.28, 3.08), and a higher CD4+ T cell count, RR = 1.15 (1.0028, 1.3115) for 100 cells. Interventions to prevent curable STI in HIV-infected women are warranted in primary care settings.

Absenteeism↗

Adherence to HAART among HIV-infected persons in rural Louisiana.

The purpose of this study was to examine factors associated with nonadherence to highly active antiretroviral therapy (HAART) in patients seen in HIV clinics throughout nonurban Louisiana. A convenience sample of 273 patients from 8 areas in nonurban Louisiana were interviewed to obtain demographic, clinical and adherence information. Associations between demographic, clinical, and behavioral factors and nonadherence were examined. Ideally, non-adherence should not exceed 5% in patients for whom HAART was prescribed. Mean age was 38.6 years (range, 19-66), 29.3% were female, 60.1% were African American, 34.4% reported nonadherence to their HAART medication (defined as the subject's self-report of missing any doses of HAART medication in the prior week). In the prior month, participants reported the following behaviors: binge drinking (12.8%), problem drinking (12.8%), and illicit drug use (16.5%). Depression was found in 49.8% of the respondents. In logistic regression analysis, problem drinking odds ratio [OR] (95% confidence interval [CI]): 3.92 (1.69,9.09) was found to be associated with nonadherence. Demographic and behavioral factors such as illicit drug use and depression were not associated with nonadherence on multivariable analysis. Problem drinking was associated with lack of adherence to HAART over the past week. Interventions to treat problem drinking are needed and may improve adherence to medication for HIV-infected persons living in rural, town, and small-city areas.

Adult↗

Vaginal douching: personal practices and public policies.

BACKGROUND: Vaginal douching is associated with adverse reproductive health outcomes, yet both health providers and women are often poorly informed about details of this practice. METHODS: We searched the English language articles in the MEDLINE database (1965-March 2004) to describe vaginal douching products, policies of professional organizations, predictors of douching practice, douching methods used, timing of use, and motivation. A key report was obtained from the Food and Drug Administration (FDA) via the Freedom of Information Act. Additional product information was obtained from manufacturers. Primary key terms for the literature search included (vagina OR vaginal) and (douche OR douching). Health effects of douching are reviewed briefly; personal practices and public policies are highlighted. RESULTS: From the literature search, we identified 432 papers, of which 150 were reviewed in detail. Contrary to the assumptions of many health professionals, douching products are only loosely regulated by the FDA. Few professional organizations have clearly stated policy statements regarding douching. In the United States, the prevalence of douching varies considerably by race (more common among African Americans) and age cohort (more common in women born earlier). Internationally, vaginal douching is common in some cultures and is rare in others. Opinions of mothers, peers, and health professionals, in addition to marketing of commercial products, affect douching behavior. CONCLUSIONS: Regulation of vaginal douching products and public education efforts on douching behavior need to be reassessed. Because of the preponderance of evidence that suggests an association between vaginal douching and adverse reproductive health outcomes, professional and public health associations should consider educational and policy activities to discourage women from douching.

Age Distribution↗

Timing of the maternal drug dose and risk of perinatal HIV transmission in the setting of intrapartum and neonatal single-dose nevirapine.

CONTEXT: Single-dose intrapartum and neonatal nevirapine (NVP) reduces perinatal HIV transmission and is in increasingly common use throughout the developing world. OBJECTIVE: We studied risk factors for perinatal transmission in the setting of NVP. DESIGN AND SETTING: A prospective cohort study at two public obstetrical clinics in Lusaka, Zambia. PATIENTS AND METHODS: In a volunteer sample of HIV-infected pregnant women and their newborns, the women received a 200 mg oral dose of NVP at the onset of labor; their infants received 2 mg/kg of NVP syrup within 24 h of birth. The main outcome measure was the infant HIV infection status at 6 weeks of life, determined by DNA polymerase chain reaction. RESULTS: Only 31 of 278 (11.2%) infants were infected at 6 weeks. In logistic regression, viral load exceeding the median [adjusted odds ratio (AOR), 3.1; 95% confidence interval (CI), 1.1-8.7] and 1 h or less elapsing between NVP ingestion and delivery (AOR, 5.0; 95% CI, 1.8-14) were associated with transmission. Women delivering within 1 h of NVP ingestion had a lower mean drug concentration (351 versus 942 ng/ml; P<0.001) and were more likely to have a 'sub-therapeutic' NVP level of less than 100 ng/ml (56 versus 20%; P<0.001) than those who delivered more than 1 h post-ingestion. However, concentrations <100 ng/ml were not more likely to be associated with transmission than concentrations > or = 100 ng/ml (12.9 versus 11.7%; P=0.8). We did not identify a threshold concentration below which risk of transmission increased. CONCLUSIONS: We confirmed low perinatal transmission rates with single-dose NVP. At least 1 h of pre-delivery NVP prophylaxis was a critical threshold for efficacy.

Adolescent↗

Developing a human immunodeficiency virus/acquired immunodeficiency syndrome therapeutic research agenda for resource-limited countries: a consensus statement.

To develop a research agenda for use of antiretroviral therapy (ART) in countries with highly limited resources for health, research questions focused on 3 areas: when therapy should be initiated, what therapies should be used, and the most appropriate methods for patient monitoring. Participants from 23 countries and 6 continents were clinical and academic researchers, health care practitioners, policy authorities, pharmaceutical experts, and health care advocates. The conference attendees reviewed background materials and participated in 13 state-of-the-art presentations on ART provision in resource-limited countries, treatment access, ethics, community issues, and sustainability. Conferees separated into smaller groups to identify priorities for specific research agendas. Existing multinational human immunodeficiency virus (HIV) clinical trials networks, such as the HIVNAT (The Netherlands, Australia, and Thailand) Network, were studied as infrastructure models for research into affordable, sustainable treatment and monitoring strategies suitable for resource-limited settings. The delivery of ART in resource-limited countries is a vital priority for health care providers and the millions of people living with HIV disease. To achieve sustainable approaches to HIV/acquired immunodeficiency syndrome care, research relevant to resource-limited settings must involve local researchers and community representatives to promote development of local capacity.

Clinical Trials as Topic↗

Prevention of mother-to-child transmission of HIV in Africa: successes and challenges in scaling-up a nevirapine-based program in Lusaka, Zambia.

BACKGROUND: Nearly half of perinatal HIV infection is preventable with nevirapine (NVP), which has transformed the ability to confront this transmission route in resource-limited settings. METHODS: A NVP-based perinatal HIV prevention program initiated in Lusaka, Zambia in November 2001. RESULTS: The first 12 months cost US$221 000 and enabled 178 district health employees to be trained in voluntary counseling and testing: 17 263 pregnant women were counseled for HIV, 12 438 (72%) were tested, and 2924 (24%) were found to be infected with HIV. NVP has been taken by 1654 (57%) mothers and 1157 (40%) babies. It is estimated that at least 190 infants have been spared HIV infection (11 per 1000 counseled women or 65 per 1000 identified HIV-infected women). CONCLUSIONS: Prevention of mother-to-child HIV transmission is feasible and cost effective in resource-limited settings. In Lusaka, thousands of women have received voluntary counseling and testing and NVP therapy under the present scheme. Patient attrition and non-adherence represented a major source of program inefficiency, which requires to be systematically addressed.

Antiviral Agents↗

Comparison of two strategies for administering nevirapine to prevent perinatal HIV transmission in high-prevalence, resource-poor settings.

Universal nevirapine (NVP) therapy (provision of the drug without HIV testing) has been suggested as potentially superior to targeted NVP therapy (provision of the drug to seropositive patients identified through voluntary HIV counseling and testing [VCT]) for perinatal HIV prevention in low-resource, high-prevalence settings. The authors postulated that uptake (the proportion of women who accept the strategy when offered) may be higher for universal therapy, since it does not require a woman to learn her serostatus; they further postulated that adherence (the proportion of women who actually ingest the NVP tablet at labor onset) may be higher for targeted therapy, since knowledge of serostatus could motivate better adherence. Two clinics in Lusaka, Zambia were assigned to provide either the targeted or universal strategy. Halfway through the study period, the approach offered at each clinic was crossed over. Adherence was assessed by liquid chromatographic assay for NVP of cord blood. Regarding uptake, 1524 pregnant women were offered participation, and 1025 (67%) accepted. Of 694 women offered enrollment in the universal strategy, 496 (71%) accepted; of 830 women offered enrollment in the targeted strategy, 529 (64%) accepted (p <.01). Uptake was similar at both clinics for the universal strategy: 250 of 339 (74%) at clinic A and 246 of 355 (69%) at clinic B (p =.2), but differed significantly between clinics for the targeted strategy: 229 of 316 (72%) at clinic A and 300 of 514 (58%) at clinic B (RR, 1.51; 95% CI, 1.23, 1.86). Increased uptake correlated with having been offered the universal rather than the targeted strategy (AOR, 1.5; 95% CI, 1.1, 2.1), attendance at clinic A (AOR, 1.4; 95% CI, 1.01, 2.0), and maternal report of a prior fetal or infant death (AOR, 1.6; 95% CI, 1.1, 2.5). Regarding adherence, in the universal strategy, 40 of 103 women (39%) were nonadherent compared with 25 of 98 women (26%) in the targeted strategy (RR, 1.5; 95% CI, 1.004, 2.3). Failure to adhere correlated with participation in the universal strategy (AOR, 2.0; 95% CI, 1.04, 4.2) and illiteracy (AOR, 2.6; 95% CI, 1.2, 5.3). In high-prevalence settings with adequate VCT services, uptake of NVP using the universal or targeted approach appears comparable. However, the universal strategy may result in better uptake in clinics with less well-functioning VCT services (as with clinic B). Adherence to the single-dose NVP intervention was lower among women who did not learn their HIV status. Programs that seek to save the greatest possible number of infants from perinatal HIV acquisition should consider a combination approach, in which women who desire HIV testing can access NVP through a targeted strategy, and women who do not desire testing can access NVP through a universal strategy.

Adult↗

CC chemokine receptor 5 genotype and susceptibility to transmission of human immunodeficiency virus type 1 in women.

The human gene for CC chemokine receptor 5, a coreceptor for human immunodeficiency virus type 1 (HIV-1), affects susceptibility to infection. Most studies of predominantly male cohorts found that individuals carrying a homozygous deleted form of the gene, Delta 32, were protected against transmission, but protection did not extend to Delta 32 heterozygotes. The role played by this mutation in HIV-1 transmission to women was studied in 2605 participants in the Women's Interagency HIV Study. The Delta 32 gene frequency was 0.026 for HIV-1-seropositive women and 0.040 for HIV-1-seronegative women, and statistical analyses showed that Delta 32 heterozygotes were significantly less likely to be infected (odds ratio, 0.63 [95% confidence interval, 0.44-0.90]). The CCR5 Delta 32 heterozygous genotype may confer partial protection against HIV-1 infection in women. Because Delta 32 is rare in Africans and Asians, it seems plausible that differential genetic susceptibility, in addition to social and behavioral factors, may contribute to the rapid heterosexual spread of HIV-1 in Africa and Asia.

Cohort Studies↗

Utility of cervicography in HIV-infected and uninfected adolescents.

PURPOSE: To compare cytology with cervicography in HIV-infected and uninfected adolescent females. METHODS: At the time of analysis, 334 girls aged 13-19 years from 13 U.S. cities were participating in a prospective study of HIV infection. All subjects had cytology and a Cervigram (cervicography) performed at two consecutive visits 6 months apart, referred to as visit (V) 1 and 2. Cervigrams were sent to the parent company for diagnosis and were categorized as: "negative" or "positive" (compatible with low-grade or high-grade squamous intraepithelial lesions [SIL]). Cytology was considered abnormal if the subject had SIL at either V1 or V2. Sensitivity, specificity, and positive predictive value (PPV) of the Cervigram were calculated compared with repeat Papanicolaou (Pap) smears. RESULTS: Two consecutive adequate Pap smears were available for analysis in 200 adolescents; 51% (95% CI, 43-59) of the 142 HIV-positive youth and 19% (95% CI, 9-29) of the 58 HIV-negative youth had SIL on at least one Pap smear (p < .001). A positive Cervigram was observed in 44% (95% CI, 36-53) of the HIV-infected group and 29% (95% CI, 17-41) of the HIV-uninfected group (p =.06). For the HIV-infected group, the sensitivity, specificity, and PPV of the Cervigram to detect SIL were 58% (95% CI, 45-71), 69% (95%CI, 57-80), and 64% (95%CI, 52-77), respectively. For the HIV-uninfected group, the sensitivity, specificity, and PPV were 64% (95% CI, 31-89), 80% (95% CI, 65-90), and 44% (95% CI, 19-68), respectively. The combined sensitivity, using both the Pap smear and Cervigram result from V1 to detect SIL, was 82% (95% CI, 71-91 for HIV+ and 48-98 for HIV-) in both groups. However, the PPV based the performance of the Cervigram in Pap smear-negative women as 33% (95% CI, 17-53) and 15% (95% CI, 2-45) for the HIV-infected and uninfected group, respectively (p = not significant [ns]). CONCLUSIONS: Although the sensitivity of a single Pap smear increased significantly when the Cervigram was used as an adjunct, the low PPV in both HIV-infected and uninfected groups, suggests that cervicography has a limited utility for precancer and cervical cancer screening in high-risk adolescent populations.

Adolescent↗