In 2019, NIH combined the Multicenter AIDS Cohort Study and the Women’s Interagency HIV Study into the MACS/WIHS Combined Cohort Study (MWCCS). Participants completing a visit October 2018-September 2019 (targeted for MWCCS enrollment) are described by HIV serostatus and compared to people living with HIV (PLWH) in the U.S. Participants include 2115 women, 1901 men, median age 56 years (IQR 48-63), 62% PLWH. Study sites encompass the South (18%), Mid-Atlantic/Northeast (45%), West Coast (22%), and Midwest (15%). Participant race/ethnicity approximates that of U.S. PLWH. Longitudinal data and specimens collected for 35 years (men) and 25 years (women) were combined. Differences in data collection and coding were reviewed and key risk factor and comorbidity data harmonized. For example, recent use of alcohol (62%) and tobacco (28%) are common, as are dyslipidemia (64%), hypertension (56%), obesity (42%), impaired daily activities (31%), depressive symptoms (28%), and diabetes (22%). The repository includes serum, plasma, cells, cell pellets, urine, cervical vaginal lavage, oral, B-cell lines, stool, and semen specimens. Demographic differences between the MACS and WIHS can confound analyses by sex. The merged MWCCS is both an ongoing observational cohort and a valuable resource of harmonized longitudinal data and specimens for HIV-related research.

Background: Reactive case detection (RCD) seeks to enhance malaria surveillance and control by identifying and treating parasitaemic individuals residing near index cases. In Zambia, this strategy starts with passive detection of symptomatic incident malaria cases at local health facilities or by community health workers, with subsequent home visits to screen-and-treat residents in the index case and neighbouring (secondary) households within a 140-m radius using rapid diagnostic tests (RDTs). However, a small circular radius may not be the most efficient strategy to identify parasitaemic individuals in low-endemic areas with hotspots of malaria transmission. To evaluate if RCD efficiency could be improved by increasing the probability of identifying parasitaemic residents, environmental risk factors and a larger screening radius (250 m) were assessed in a region of low malaria endemicity. Methods: Between January 12, 2015 and July 26, 2017, 4170 individuals residing in 158 index and 531 secondary households were enrolled and completed a baseline questionnaire in the catchment area of Macha Hospital in Choma District, Southern Province, Zambia. Plasmodium falciparum prevalence was measured using PfHRP2 RDTs and quantitative PCR (qPCR). A Quickbird ™ high-resolution satellite image of the catchment area was used to create environmental risk factors in ArcGIS, and generalized estimating equations were used to evaluate associations between risk factors and secondary households with parasitaemic individuals. Results: The parasite prevalence in secondary (non-index case) households was 0.7% by RDT and 1.8% by qPCR. Overall, 8.5% (n = 45) of secondary households had at least one resident with parasitaemia by qPCR or RDT. The risk of a secondary household having a parasitaemic resident was significantly increased in proximity to higher order streams and marginally with increasing distance from index households. The adjusted OR for proximity to third-and fifth-order streams were 2.97 (95% CI 1.04-8.42) and 2.30 (95% CI 1.04-5.09), respectively, and that for distance to index households for each 50 m was 1.24 (95% CI 0.98-1.58).

Background The COVID-19 pandemic has disrupted health care access in many countries. The aim of this study was to explore factors that influenced access and utilisation of sexual and reproductive health services among Ugandan youths during the COVID-19 pandemic lockdown. Methods This was across-sectional study carried out from April 2020 to May 2020 in Uganda. A questionnaire was administered online to participants aged 18 to 30 years. Subjects were recruited using a snowballing approach. STATA version 14.2 was used for statistical analysis.Results Of 724 participants, 203 (28%) reported that they did not have access to information and/or education concerning sexual and reproductive health (SRH). More than a quarter of the participants (26.9%, n=195) reported that testing and treatment services of sexually transmitted infections were not available during the lockdown. 27.2% could not obtain contraceptive supplies. Access to HIV services and menstrual supplies were also impaired. Lack of transportation was the commonest factor cited as limiting access to SRH services during the lockdown (68.7%), followed by the long distance from home to SRH facilities (55.2%), high cost of services (42.2%) and the curfew (39.1%). Sexually transmitted infections were the commonest SRH problems related to SRH during the lockdown (40.4%) followed by unwanted pregnancy (32.4%) and sexual abuse (32.4%). Marital, educational, and employment status were significantly correlated with the reported experiences of the participants. Conclusion Access to SRH information and services for Ugandan youths was restricted during the COVID-19 lockdown and may have increased the incidence of poor SRH outcomes. Lack of transportation, distance to health facilities, and high cost of services were important limiting factors. The Government and other stakeholders should incorporate SRH among the priority services to be preserved during future outbreaks.

Background The total QT interval comprises both ventricular depolarization and repolarization currents. Understanding how HIV serostatus and other risk factors influence specific QT interval subcomponents could improve our mechanistic understanding of arrhythmias. Methods Twelve‐lead electrocardiograms (ECGs) were acquired in 774 HIV‐infected (HIV+) and 652 HIV‐uninfected (HIV−) men from the Multicenter AIDS Cohort Study. Individual QT subcomponent intervals were analyzed: R‐onset to R‐peak, R‐peak to R‐end, JT segment, T‐onset to T‐peak, and T‐peak to T‐end. Using multivariable linear regressions, we investigated associations between HIV serostatus and covariates, including serum concentrations of inflammatory biomarkers such as interleukin‐6 (IL‐6), and each QT subcomponent. Results After adjustment for demographics and risk factors, HIV+ versus HIV− men differed only in repolarization phase durations with longer T‐onset to T‐peak by 2.3 ms (95% CI 0–4.5, p < .05) and T‐peak to T‐end by 1.6 ms (95% CI 0.3–2.9, p < .05). Adjusting for inflammation attenuated the strength and significance of the relationship between HIV serostatus and repolarization. The highest tertile of IL‐6 was associated with a 7.3 ms (95% CI 3.2–11.5, p < .01) longer T‐onset to T‐peak. Age, race, body mass index, alcohol use, and left ventricular hypertrophy were each associated with up to 2.2–12.5 ms longer T‐wave subcomponents. Conclusions HIV seropositivity, in combination with additional risk factors including increased systemic inflammation, is associated with longer T‐wave subcomponents. These findings could suggest mechanisms by which the ventricular repolarization phase is lengthened and thereby contribute to increased arrhythmic risk in men living with HIV.

BackgroundThe COVID-19 pandemic has caused a wide range of disruptions in health care access in many low and middle income countries. The aim of this study was to explore factors that influenced access and utilisation of sexual and reproductive health services among Ugandan youths during the COVID-19 pandemic lockdown. MethodsThis was an online cross-sectional study carried out from April 2020 to May 2020 in Uganda. An online questionnaire was used and participants aged 18years to 30 years were recruited using the snowballing approach. The statistical analysis was done using STATA version 14.2.Results Out of 724 participants, 203 (28%) reported not having information and/or education concerning sexual and reproductive health (SRH). About a quarter of the participants (26.9%, n=195) reported not having access to testing and treatment services of sexually transmitted infections during the lockdown. Lack of transport means was the commonest (68.7%) limiting factor to accessing SRH services during the lockdown followed by the long distance from home to SRH facilities (55.2%), high cost of services (42.2%) and curfew conditions (39.1%). Sexually transmitted infections were the commonest (40.4%) problems related to SRH during the lockdown followed by unwanted pregnancy (32.4%) and sexual abuse (32.4%). Limiting factors were more prevalent among the co-habiting youths [CPR: 1.3 (1.13-1.49) and APR:1.2 (1.06-1.41)] followed by unemployed [CPR: 1.3 (1.09 - 1.53) and APR:1.2 (1 - 1.42)] and non-salaried [APR:1.2 (1- 1.42)] than other participants. The bivariate and multivariate regression analyses indicate that problems were more prevalent among the co-habiting youths [CPR: 2.7 (1.88 - 3.74) and APR: 2.3 (1.6 - 3.29)] followed by the unemployed [CPR: 2 (1.27 - 3.2) and APR: 1.6 (1.03 - 2.64)] than in other categories. ConclusionThe findings of this study show that Ugandan youths had limited access to SRH information and services during the COVID-19 lockdown. Cohabiting and unemployed youths were the most affected by problems related to SRH. Lack of transport means and high cost of services were the major limiting factors to access SRH services among the youths. The findings call for concerted efforts from the Government and other stakeholders to incorporate SRH among the priority services when designing responses to any outbreak crisis.

IntroductionSexual and Reproductive Health access to Information services is still a pressing need for youth in Uganda even during the COVID-19 pandemic, which has disrupted health care access in many countries. The aim of this study was to explore the challenges in access and utilization of sexual and reproductive health services as faced by youth during the COVID-19 pandemic lockdown in Uganda.MethodsThis was a cross-sectional study carried out from 28th April 2020 to 11th May 2020 in Uganda. An online questionnaire was disseminated to youth aged between 18 and 30 years over a period of 14 days. The snowball sampling method was used to recruit participants. STATA version 14.2 was used for statistical analysis.ResultsOf 724 participants, 203 (28%) reported that they did not have access to information and/or education concerning sexual and reproductive health (SRH). More than a quarter of the participants (26.9%, n = 195) reported that testing and treatment services of sexually transmitted infections were not available during the lockdown, and 27.2% could not obtain contraceptive supplies. Access to HIV/AIDS care services and menstrual supplies was also impaired. Lack of transportation was the commonest factor cited as limiting access to SRH services during the lockdown (68.7%), followed by the long distance from home to SRH facilities (55.2%), high cost of services (42.2%) and the curfew (39.1%). Sexually transmitted infections were the commonest SRH problems related to SRH during the lockdown (40.4%) followed by unwanted pregnancy (32.4%) and sexual abuse (32.4%). Marital, educational, and employment status were significantly correlated with the reported experiences of the participants.ConclusionAccess to SRH information and services for Ugandan youth was restricted during the COVID-19 lockdown and leaving them vulnerable to various SRH risks and adverse outcomes. Lack of transportation, long distances to health facilities, and high cost of services were important limiting factors. The Government and other stakeholders should incorporate SRH among the priority services to be preserved during future outbreaks.

Background Clinically useful predictors for fatal toxoplasmosis are lacking. We investigated the value of serological assays for antibodies to whole Toxoplasma antigens and to peptide antigens of the Toxoplasma cyst protein MAG1, for predicting incident toxoplasmic encephalitis (TE) in people living with HIV (PLWH). Methods We performed a nested case control study, conducted within the Multicenter AIDS Cohort Study (MACS), using serum samples obtained 2 years prior to diagnosis of TE from 28 cases, and 37 HIV disease-matched Toxoplasma seropositive controls at matched time-points. Sera were tested for Toxoplasma antibodies using a commercial assay and for antibodies to MAG1_4.2 and MAG1_5.2 peptides in ELISA. Results Two years prior to clinical diagnosis, 68% of TE cases were MAG1_4.2 seropositive compared with 16% of controls (OR 25.0, 95% CI 3.14-199.18). Corresponding results for MAG1_5.2 seropositivity were 36% and 14% (OR 3.6, 95% CI 0.95-13.42). Higher levels of antibody to MAG1_4.2 (OR 18.5 per doubling of the OD value, 95% CI 1.41-242) and to Toxoplasma (OR 2.91 for each OD unit increase, 95% CI 1.48-5.72) were also associated with the risk of TE. When seropositivity was defined as the presence of MAG1 antibody or relatively high levels of Toxoplasma antibody, the sensitivity was 89% and specificity was 68% for subsequent TE. Conclusions Antibodies to MAG1 showed predictive value on the occurrence of TE in PLWH, and the predictive performance was further improved by adding the levels of Toxoplasma antibody. These measures could be clinically useful for predicting subsequent diseases in multiple at-risk populations.

Measurement error, although ubiquitous, is uncommonly acknowledged and rarely assessed or corrected in epidemiologic studies. This review offers a straightforward guide to common problems caused by measurement error in research studies and a review of several accessible bias-correction methods for epidemiologists and data analysts. Although most correction methods require criterion validation including a gold standard, there are also ways to evaluate the impact of measurement error and potentially correct for it without such data. Technical difficulty ranges from simple algebra to more complex algorithms that require expertise, fine tuning, and computational power. However, at all skill levels, software packages and methods are available and can be used to understand the threat to inferences that arises from imperfect measurements.