Objectives This study aimed to identify factors associated with access to HIV care and antiretroviral (ARV) drugs for prevention of mother-to-child transmission (PMTCT) of HIV among HIV-positive pregnant women in a community cohort in rural Tanzania (Kisesa). Methods Kisesa-resident women who tested HIVpositive during HIV serosurveillance and were pregnant (while HIV-positive) between 2005 and 2012 were eligible. Community cohort records were linked to PMTCT and HIV clinic data from four facilities (PMTCT programme implemented in 2009; referrals to city-based hospitals since 2005) to ascertain service use. Factors associated with access to HIV care and ARVs during pregnancy were analysed using logistic regression. Results Overall, 24% of women accessed HIV care and 12% accessed ARVs during pregnancy (n=756 pregnancies to 420 women); these proportions increased over time. In multivariate analyses for 2005-2012, being married, prior voluntary counselling and testing, increasing age, increasing year of pregnancy and increasing duration of infection were independently associated with access to care and ARVs. Residence in roadside areas was an independent predictor of access to care but not ARVs. There was no evidence of an interaction with time period. Conclusions Access to PMTCT services was low in this rural setting but improved markedly over time. There were fairly few sociodemographic differentials although support for young women and those without partners may be needed. Further decentralisation of HIV services to more remote areas, promotion of voluntary counselling and testing and implementation of Option B+ are likely to improve uptake and may bring women into care and treatment sooner after infection.
Kisesa is a rural community in north-western Tanzania, 20 km east of Mwanza city in Magu district. Approximately 30 000 individuals inhabit the DSS area of roughly 150 km2 that includes a trading centre and five other villages (roadside, or rural, where housing is fairly dispersed). There are three village dispensaries and a health centre in the trading centre (government-run). Implementation of PMTCT services started in 2009, including provider-initiated HIV testing and counselling and provision of ARV prophylaxis at ANCs, with referrals to the HIV care and treatment clinic (CTC) in the health centre for long-term care and ARV therapy (ART) (see figure 1 and see online supplement 1 for PMTCT protocols). From 2005 to 2009, pregnant women diagnosed with HIV at voluntary counselling and testing (VCT) services in the health centre were referred to hospitals in Mwanza city for PMTCT services. At the health centre, ANC, CTC and VCT services are carried out in separate buildings. Antenatal HIV prevalence in Magu district has declined from 10.7% in 2000 to 8.9% in 2008.8 9 Cascade of prevention of mother-to-child transmission (PMTCT) services available in the dispensaries and/or health centre in Kisesa in 2009–2012, as well as referral services to city-based hospitals from 2005. ANC, antenatal clinic; PITC, provider-initiated testing and counselling; ARV, antiretroviral; CTC, care and treatment clinic; VCT, voluntary counselling and testing. From 2005 to 2009, pregnant women diagnosed with HIV at VCT services in the health centre were referred to hospitals in Mwanza city for PMTCT services. *In 2005–2011, HIV-positive pregnant women with CD4 counts <200 cells/mm3 were eligible for antiretroviral treatment (ART) for their own health (lamivudine (3TC) or emtricitabine, plus azidothymidine (AZT) or tenofovir, with efavirenz or nevirapine), otherwise ARV prophylaxis was provided: in 2005–2006 single-dose nevirapine at onset of labour; in 2007–2011 AZT from 28 weeks gestation (single-dose nevirapine, AZT and 3TC during labour) until 7 days postpartum (AZT plus 3TC). The treatment threshold was raised to 350 cells/mm3 in 2012 (ARV prophylaxis from 14 weeks (drug regimens remained unchanged), ‘Option A’).30 **In 2005–2006 infants received nevirapine within 72 h of birth; 2007–2011, infants received nevirapine for 1 week after birth and AZT for up to 4 weeks. Under ‘Option A’ in 2012 they received nevirapine prophylaxis until 1 week after cessation of breastfeeding (4–6 weeks if replacement feeding). Infant dried blood spot samples were sent for HIV testing to the national referral hospital in Mwanza city. The Kisesa cohort study started in 1994,10 with DSS enumeration of the entire population every 6 months. Enumerators visit households to record all births, pregnancies, migrations and deaths. HIV serological surveys are conducted approximately every 3 years (seven to date, most recently in 2013) within each village among resident adults aged ≥15 years. Participants consent to give blood for HIV research testing without results disclosure, are offered VCT, and are interviewed about economic activities, childbearing, use of health services, and knowledge of HIV. Routine clinic data were collected retrospectively from all four Kisesa facilities (approximately 10% of women in the seventh serosurvey attended ANC outside Kisesa). All records from 2005 to 2012 were abstracted from ANC pregnancy registers (some records (<10%) from different clinics and time periods were missing), PMTCT programme registers and the CTC (including patients who enrolled at city-based CTCs and transferred back to Kisesa). Data were double-entered, apart from CTC data. Community cohort data were linked to clinic data sets by matching on personal attributes (eg, age, sex, village of residence and pregnancy dates), using an algorithm developed from a gold standard of ANC numbers captured from women's ANC cards during DSS round 27 (2012). The algorithm had a sensitivity of 70% and positive predictive value of 98% for matching ANC clinic records, with a similar algorithm used to match CTC data (algorithms were based on a similar approach to Kabudula et al).11 12 PMTCT register records were linked to ANC and CTC records using ANC or CTC registration numbers, respectively. Sources of pregnancy data were child birth dates in the DSS (linked to mothers), mothers’ self reports of pregnancies or births in the DSS or serosurveys, and clinic pregnancy records. Women residing in Kisesa in 2005–2012, testing HIV-positive during any serosurvey, and pregnant during this interval were eligible. HIV seroconversion dates were estimated using the midpoint between first positive and last negative test dates. Prevalent cases were assumed to have seroconverted 3 years prior to their first positive test date (based on average duration of infection for seroincident cases). The denominator comprised HIV-positive pregnancies, excluding pregnancy records that lacked serosurvey interview data within 5 years. Two outcomes were assessed: (1) enrolled in a PMTCT programme and/or CTC (‘HIV care’) during or before pregnancy, and (2) accessed ARV drugs during pregnancy. Enrolment in HIV care was defined as linkage of a DSS record to a PMTCT or CTC clinic record. Dates of clinic registration were aligned with pregnancy dates to verify service access during each pregnancy. Maternal ARV access was defined as receipt of ARV drugs documented on any ANC visit in PMTCT registers, or a CTC record indicating initiation or continuation of ART during pregnancy (before the recorded or estimated delivery date). Data on infant ARVs or HIV diagnoses could not be linked to mothers’ records. Explanatory variables were constructed using DSS data or serosurvey questions, taking information from the round closest to the pregnancy. Knowledge of HIV transmission was assessed by asking respondents to mention any modes of HIV transmission. ART knowledge was assessed using the number of correct answers to five true or false statements about ART (detailed in table 1). Responses to knowledge questions after the pregnancy date were distinguished, as knowledge was hypothesised to change as a result of attending the clinic. Death of a child was defined as any self-reported miscarriage, stillbirth or child death after birth. VCT use prior to pregnancy was based on attendance at VCT in an earlier serosurvey, or self-reported VCT use before the pregnancy date. HIV status of partners was determined using DSS line numbers of the spouse and spousal serosurvey HIV test data. Age was modelled as a continuous variable; all other quantitative variables were categorised. Characteristics of pregnancies (n=756) to HIV-positive women in Kisesa and proportions accessing HIV care/ARVs by factor Missing values: education (1); religion (13); ethnicity (1); income (3); children died (17); relatives died (17); know someone on ART (38). *No prior report: knowledge data point after pregnancy, or from an earlier serosurvey questionnaire lacking the same question. †Statements: “Drugs can only slow down HIV illness not stop it”; “ART drugs are very dangerous and can kill people”; “ART drugs have to be used for life”; “ART drugs are available free of charge in Tanzania”; “Everyone who is infected with HIV needs drugs”. ‡Unknown to the study investigators. ART, antiretroviral treatment; ARV, antiretroviral; MTCT, mother-to-child transmission; P1–4, primary level 1–4 years; P5, primary level 5 years; VCT, voluntary counselling and testing. Descriptive analyses, followed by bivariate and multivariate logistic regression analyses (deemed appropriate given the short and homogeneous follow-up time per pregnancy) were performed using Stata V.12 (StataCorp LP, Texas, USA) to identify independent predictors of access to HIV care or ARVs. All factors associated with the outcome (p≤0.1) in bivariate analyses were assessed in multivariate models, using a forwards stepwise approach. Variables were retained if they significantly improved the model fit (p≤0.1, based on likelihood ratio tests). Clustering due to multiple pregnancies per woman was accounted for using random effects, checking for quadrature stability. Interactions with calendar year of pregnancy or age were assessed. For continuous variables, departure from linearity was assessed using likelihood ratio tests. Informed consent was obtained from all serosurvey participants. Data typists and managers received ethics training. Names of patients with HIV were not visible to data typists. Data sets were stored on password-restricted computer networks.