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The CIDRZ Research Repository serves as an open-access archive for peer-reviewed publications, conference papers, and other scholarly outputs from CIDRZ researchers. Our goal is to promote the dissemination of knowledge and support evidence-based public health initiatives.

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We have recently added new publications on HIV prevention, maternal health, and epidemiology. Browse the latest research in our repository.

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Cervical cancer prevention and care in HIV clinics across sub-Saharan Africa: results of a facility-based survey.
(2024-Jul) Asangbeh-Kerman, Serra L. ; Davidović, Maša ; Taghavi, Katayoun; Dhokotera, Tafadzwa; Manasyan, Albert; Sharma, Anjali; Jaquet, Antoine; Musick, Beverly ; Twizere, Christella; Chimbetete, Cleophas; Murenzi, Gad; Tweya, Hannock ; Muhairwe, Josephine; Wools-Kaloustian, Kara; Technau, Karl-Gunter ; Anastos, Kathryn; Yotebieng, Marcel; Jousse, Marielle; Ezechi, Oliver; Orang'o, Omenge ; Bosomprah, Samuel ; Pierre, Simon B.; Basu, Partha; Bohlius, Julia
INTRODUCTION: To eliminate cervical cancer (CC), access to and quality of prevention and care services must be monitored, particularly for women living with HIV (WLHIV). We assessed implementation practices in HIV clinics across sub-Saharan Africa (SSA) to identify gaps in the care cascade and used aggregated patient data to populate cascades for WLHIV attending HIV clinics. METHODS: Our facility-based survey was administered between November 2020 and July 2021 in 30 HIV clinics across SSA that participate in the International epidemiology Databases to Evaluate AIDS (IeDEA) consortium. We performed a qualitative site-level assessment of CC prevention and care services and analysed data from routine care of WLHIV in SSA. RESULTS: Human papillomavirus (HPV) vaccination was offered in 33% of sites. Referral for CC diagnosis (42%) and treatment (70%) was common, but not free at about 50% of sites. Most sites had electronic health information systems (90%), but data to inform indicators to monitor global targets for CC elimination in WLHIV were not routinely collected in these sites. Data were collected routinely in only 36% of sites that offered HPV vaccination, 33% of sites that offered cervical screening and 20% of sites that offered pre-cancer and CC treatment. CONCLUSIONS: Though CC prevention and care services have long been available in some HIV clinics across SSA, patient and programme monitoring need to be improved. Countries should consider leveraging their existing health information systems and use monitoring tools provided by the World Health Organization to improve CC prevention programmes and access, and to track their progress towards the goal of eliminating CC.
COVID-19 vaccine uptake and associated risk factors among first antenatal care attendees in Zambia, 2021-2022: A repeated cross-sectional study.
(2024) Tembo, Tannia; Somwe, Paul; Bosomprah, Samuel; Heilmann, Elizabeth; Kalenga, Kalubi; Moyo, Nyembezi; Kabamba, Bupe; Seffren, Victoria; Fwoloshi, Sombo; Rutagwera, Marie-Reine ; Musunse, Maximillian; Mwiinga, Linos; Gutman, Julie R.; Hines, Jonas Z.; Sikazwe, Izukanji
Pregnant women are considered a high-risk group for COVID-19, and a priority for vaccination. Routine antenatal care (ANC) provides an opportunity to track trends and factors associated with vaccine uptake. We sought to evaluate COVID-19 vaccine uptake among pregnant women attending ANC and assess the factors associated with vaccine in Zambia. We conducted a repeated cross-sectional study in 39 public health facilities in four districts in Zambia from September 2021 to September 2022. Pregnant women who were aged 15-49 years were enrolled during their first ANC visit. Every month, ~20 women per facility were interviewed during individual HIV counseling and testing. We estimated vaccine uptake as the proportion of eligible participants who self-reported having received the COVID-19 vaccine. A total of 9,203 pregnant women were screened, of which 9,111 (99%) were eligible and had vaccination status. Of the 9,111 included in the analysis, 1,818 (20%) had received the COVID-19 vaccine during the study period, with a trend of increasing coverage with time (0.5% in September 2020, 27% in September 2022). Conversely, 3,789 (42%) reported not being offered a COVID-19 vaccine. We found that women aged 40-49 years, had no education or attained some primary school education, were not employed, and had prior COVID-19 infection were significantly associated with vaccine uptake. COVID-19 vaccine uptake among pregnant women was lower than estimates from the general population (27% across the four districts in September 2022), pointing to missed opportunities to protect this high-risk group. ANC visits were a viable point for conducting COVID-19 surveillance. Incorporating the vaccine as part of the routine ANC package might increase coverage in this group.
Preferences for pre-exposure prophylaxis delivery among HIV-negative pregnant and breastfeeding women in Zambia: evidence from a discrete choice experiment.
(2024) Hamoonga, Twaambo E.; Mutale, Wilbroad; Igumbor, Jude; Bosomprah, Samuel; Arije, Olujide; Chi, Benjamin H.
INTRODUCTION: Pregnant and breastfeeding women at substantial risk for HIV infection in sub-Saharan Africa can benefit from biomedical interventions such as pre-exposure prophylaxis (PrEP). We estimated the benefit that pregnant and breastfeeding women may derive from PrEP service delivery in order to guide PrEP roll-out in the target population in Zambia. METHODS: Between September and December 2021, we conducted a discrete choice experiment (DCE) among a convenient sample of 389 pregnant and breastfeeding women not living with HIV in Lusaka, Zambia. Women aged 18 years or older, with a documented negative HIV result in their antenatal card responded to a structured questionnaire containing 12 choice sets on service delivery attributes of PrEP: waiting time at the facility, travel time to the facility dispensing PrEP, location for PrEP pick-up, health care provider attitude and PrEP supply at each refill. Mixed logit regression analysis was used to determine the participant's willingness to trade off one attribute of PrEP for the other at a 5% significance level. Willingness to wait (WTW) was used to determine the relative utility derived from each attribute against waiting time. RESULTS: Waiting time at the facility, travel time to the facility, health care provider attitude and amount of PrEP supply at each refill were important attributes of PrEP service delivery (all CONCLUSION: Patient-centered approaches can help to inform the design and implementation of PrEP services among pregnant and breastfeeding women. In this study, we found that a reduction in clinic visits-including through multi-month dispensing of PrEP-could improve uptake of services in antenatal and postnatal settings.
Health Promotion Through Existing Community Structures: A Case of Churches' Roles in Promoting Rotavirus Vaccination in Rural Zambia.
(2016-Apr) Wesevich, Austin; Chipungu, Jenala; Mwale, Mercy; Bosomprah, Samuel; Chilengi, Roma
INTRODUCTION: Rural populations, particularly in Africa, suffer worse health outcomes from poor health services access. Community health workers (CHWs) effectively improve health outcomes, but the best means for CHWs reaching rural populations is unknown. Since Zambia is predominantly Christian, this study explored the use of CHWs through churches as an existing community structure for promoting preventive health behaviors, specifically rotavirus vaccine uptake. METHODS: A noncontrolled cross-sectional study of 32 churches receiving a packaged intervention of diarrhea prevention and treatment messaging was conducted with repeated time points of data collection over 13 months (2013-2014) in the Kafue District of Zambia. Two churches were selected for each of the 17 catchment areas, and CHWs were identified and trained in the intervention of promoting 4 key messages related to diarrhea prevention and treatment: hand washing with soap, exclusive breast-feeding, rotavirus vaccination, and treating diarrhea with oral rehydration solution and zinc. The intervention was conducted within existing church's women's groups, and data was collected on attendance and the distribution of Rota Cards for tracking rotavirus immunizations. RESULTS: Nineteen (59%) churches completed the study, and CHWs delivered health messages at a total of 890 women's group meetings. The overall reach of the intervention was to 37.0% of church-attending women, and the efficacy was 67.7% (317 of 468 Rota Cards collected at health centers). DISCUSSION: Implementing community health programs is often expensive and unsustainable, but the reach and efficacy levels achieved through existing structures like churches are encouraging in resource-constrained countries. Churches can be effective channels for delivering health prevention strategies to often difficult-to-reach rural populations. Further research is needed to investigate the impact of the intervention on health outcomes.
Association of Maternal Immunity with Rotavirus Vaccine Immunogenicity in Zambian Infants.
(2016) Chilengi, Roma; Simuyandi, Michelo; Beach, Lauren; Mwila, Katayi; Becker-Dreps, Sylvia ; Emperador, Devy M.; Velasquez, Daniel E.; Bosomprah, Samuel; Jiang, Baoming
INTRODUCTION: Live attenuated oral vaccines against rotavirus (RV) have been shown to be less efficacious in children from developing countries. Reasons for this disparity are not fully understood. We assessed the role of maternal factors including breast milk RV-specific IgA, transplacentally acquired infant serum RV-specific IgG and maternal HIV status in seroconversion among Zambian infants routinely immunized with Rotarix™ (RV1). METHODS: 420 mother-child pairs were recruited at infant age 6-12 weeks in Lusaka. Clinical information and samples were collected at baseline and at one month following the second dose of RV1. Determination of breast milk RV-specific IgA and serum RV-specific IgA and IgG was done using standardized ELISA. Seroconversion was defined as a ≥ 4 fold rise in serum IgA titre from baseline to one-month post RV1 dose 2, while seropositivity of IgA was defined as serum titre ≥ 40 and antibody variables were modelled on log-base 2. Logistic regression was used to identify predictors of the odds of seroconversion. RESULTS: Baseline infant seropositivity was 25.5% (91/357). The seroconversion frequency was 60.2% (130/216). Infants who were IgA seropositive at baseline were less likely to seroconvert compared to their seronegative counterparts (P = 0.04). There was no evidence of an association between maternal HIV status and seroconversion (P = 0.25). Higher titres of breast milk rotavirus-specific IgA were associated with a lower frequency of seroconverson (Nonparametric test for trend Z = -2.84; P<0.01): a two-fold increase in breast milk RV-specific IgA titres was associated with a 22% lower odds of seroconversion (OR = 0.80; 95% CI = 0.68-0.94; P = 0.01). There was seasonal variation in baseline breast milk rotavirus-specific IgA titres, with significantly higher GMTs during the cold dry months (P = 0.01). CONCLUSION: Low immunogenicity of RV1 vaccine could be explained in part by exposure to high antibody titres in breast milk and early exposure to wild-type rotavirus infections. Potential interference of anti-RV specific IgA in breast milk and pre-vaccination serum RV specific-IgA and IgG titres with RV1 seroconversion and effectiveness requires further research.
HIV Self-Testing in Lusaka Province, Zambia: Acceptability, Comprehension of Testing Instructions, and Individual Preferences for Self-Test Kit Distribution in a Population-Based Sample of Adolescents and Adults.
(2018-Mar) Zanolini, Arianna; Chipungu, Jenala; Vinikoor, Michael J.; Bosomprah, Samuel; Mafwenko, Mazuba; Holmes, Charles B.; Thirumurthy, Harsha
We assessed attitudes and preferences toward HIV self-testing (HIVST) among Zambian adolescents and adults. We conducted a population-based survey of individuals aged 16-49 years old in Lusaka Province, Zambia. HIVST was shown to participants through a short video on oral fluid-based self-testing. In addition to demographics, HIV risk perceptions, and HIV testing history, we assessed participants' acceptability and concerns regarding HIVST. Using a discrete choice experiment, we investigated preferences for the location of self-test pickup, availability of counseling, and cost. After reviewing an instructional sheet or an additional video, we assessed participants' understanding of self-test performance. Among 1617 participants, 647 (40.0%) were male, 269 (16.6%) were adolescents and 754 (46.6%) were nontesters (i.e., no HIV test in the past 12 months). After viewing the video, 1392 (86.0%) reported that HIVST would make them more likely to test and while 35.0% reported some concerns with HIVST, only 2% had serious concerns. Participants strongly preferred HIVST over finger prick testing as well as having counseling and reported willingness to pay out-of-pocket (US$3.5 for testers and US$5.5 for nontesters). Viewing an HIVST demonstration video did not improve participant understanding of self-test usage procedures compared to an instructional sheet alone, but it increased confidence in the ability to self-test. In conclusion, HIVST was highly acceptable and desirable, especially among those not accessing existing HIV testing services. Participants expressed a strong preference for counseling and a willingness to pay for test kits. These data can guide piloting and scaling-up of HIVST in Zambia and elsewhere in Africa.
How can Africa sustain its HIV response amid US aid cuts?
(2025-Jul) Mutale, Wilbroad; Semeere, Aggrey; Bukusi, Elizabeth A.; Ojji, Dike; Venter, Francois; Odeny, Thomas; Chilengi, Roma; Mosepele, Mosepele; Geng, Elvin; Sikazwe, Izukanji; Bosomprah, Samuel; Mulenga, Llyod; Simitala, Fred
Understanding linkage to care with HIV self-test approach in Lusaka, Zambia - A mixed method approach.
(2017) Chipungu, Jenala; Bosomprah, Samuel; Zanolini, Arianna; Thimurthy, Harsha; Chilengi, Roma; Sharma, Anjali; Holmes, Charles B.
INTRODUCTION: HIV self-testing (HIVST) is a novel approach designed to assist in achieving the goal of at least 90% of the population that learn their HIV status. A self-test user with a positive test is required to visit a clinic to link into HIV care, yet little is known about patient preferences for linkage strategies. We examined the intention to link to care amongst potential HIVST users and the suitability of three linkage to care strategies in Lusaka Province, Zambia. METHODS: We conducted a representative cross sectional survey of 1,617 individuals aged 16-49 years old in Lusaka Province. Participants were shown a video of the HIVST. Data on intention to link to care and preferred linkage to care strategies-text message, phone call and home visits were collected. Eight focus group discussions were held concurrently with survey respondents to understand their preferences between the three linkage to care strategies. RESULTS: Of 1617 enrolled, 60% were women, 40% were men, with an average age of 27years (IQR = 22, 35). More men than women had at least secondary education (84% vs 77%) and were either employed or self-employed (67% vs. 41%). 85% (95%CI = 83 to 86) of participants said they would link to care within the first week of a positive self-test. Income >2,000 Kwacha (USD 200) per month versus income < 2,000 Kwacha (Adjusted odds ratio (AOR) = 0.59; 95%CI: 0.40 to 0.88; p = 0.009) and never versus prior HIV testers (AOR = 0.54; 95%CI: 0.32 to 0.91; p = 0.020) were associated with reduced odds of intention to link to care. 53% (95%CI = 50 to 55) preferred being prompted to link to care by home visits compared to phone call (30%) or SMS (17%). CONCLUSION: We found almost nine out of ten potential HIVST users in the general population intend to link to care shortly after a positive test, and preferred home visits or phone calls to facilitate linkage, rather than SMS. Also, higher income earners and those who never tested for HIV were associated with reduced odds of intention to link to care. Policy guidelines and implementation strategies for HIVST should be responsive to patient preferences for linkage to care strategies to achieve the continuum of HIV care.
Effect of innate antiviral glycoproteins in breast milk on seroconversion to rotavirus vaccine (Rotarix) in children in Lusaka, Zambia.
(2017) Mwila-Kazimbaya, Katayi; Garcia, Miguel P.; Bosomprah, Samuel; Laban, Natasha M.; Chisenga, Caroline C.; Permar, Sallie R.; Simuyandi, Michelo; Munsaka, Sody; Chilengi, Roma
INTRODUCTION: Rotavirus vaccines have been introduced into national immunization programmes to mitigate morbidity and mortality associated rotavirus diarrhoea. Lower vaccine effectiveness has however been noted in low-middle income countries, but little is known about the role of maternal components found in breast milk. This study assessed the effect of lactoferrin, lactadherin, and tenascin-c on rotavirus vaccine seroconversion. METHODS: This was a retrospective cohort study of 128 infants who had been fully immunized with Rotarix™. Serum samples were collected from the infant at baseline and one month after second rotavirus vaccine dose. Breast milk samples were collected from mothers at baseline. Standard ELISA was used to determine titres of rotavirus-specific immunologlobulin G and A in breast milk and serum as well as concentrations of lactoferrin, lactadherin, and tenascin-c. Poisson regression model with robust standard error was used to estimate the effect of breast milk components on seroconversion. The components were modelled on log base 2 so that the effect would be interpreted as a doubling of the concentration. RESULTS: In a multivariable analysis adjusting for maternal age, maternal HIV status, seropositivity at baseline, sex, age of child at vaccination as well as breast milk IgA and IgG, we found evidence of independent effect of LA (Adjusted IRR = 0.95; 95% CI = 0.91-0.99; P = 0.019) on seroconversion while there was no evidence for TNC (Adjusted IRR = 1.00; 95% CI = 0.85-1.17; P = 0.967) and LF (Adjusted RR = 1.01; 95% CI = 0.96-1.05); P = 0.802). We explored the joint effects of the three components but we found no evidence (Adjusted RR = 0.95; 95% CI = 0.81; P = 0.535). CONCLUSION: High breast milk concentrations of lactadherin might play a role in infant's failure to seroconvert to rotavirus vaccines. Further research to understand this observed association is an important consideration.
Assessing capacity and readiness to manage NCDs in primary care setting: Gaps and opportunities based on adapted WHO PEN tool in Zambia.
(2018) Mutale, Wilbroad; Bosomprah, Samuel; Shankalala, Perfect; Mweemba, Oliver; Chilengi, Roma; Kapambwe, Sharon; Chishimba, Charles; Mukanu, Mulenga; Chibutu, Daniel; Heimburger, Douglas
INTRODUCTION: Sub-Saharan Africa is experiencing an epidemiological transition as the burden of NCDs overtake communicable diseases. However, it is unknown what capacity and gaps exist at primary care level to address the growing burden of NCDs. This study aimed to assess the Zambian health system's capacity to address in NCDs, using an adapted WHO Essential Non Communicable Disease Interventions (WHO PEN) tool. METHODOLOGY: This was a cross-sectional facility survey in the three districts conducted from September 2017 to October 2017. We defined facility readiness along five domains: basic equipment, essential services, diagnostic capacity, counseling services, and essential medicines. For each domain, we calculated an index as the mean score of items expressed as percentage. These indices were compared to an agreed cutoff at 70%, meaning that a facility index or district index below 70% off was considered as 'not ready' to manage NCDs at that level. All analysis were performed using Stata 15 MP. RESULTS: There appeared to be wide heterogeneity between facilities in respect of readiness to manage NCDs. Only 6 (including the three 1st level hospitals) out of the 46 facilities were deemed ready to manage NCDs. Only the first level hospitals scored a mean index higher than the 70% cut off; With regard to medications needed to manage NCDs, urban and rural health facilities were comparably equipped. However, there was evidence that calcium channel blockers (p = 0.013) and insulin (p = 0.022) were more likely to be available in urban and semi-urban health facilities compared to rural facilities. CONCLUSION: Our study revealed gaps in primary health care capacity to manage NCDs in Zambia, with almost all health facilities failing to reach the minimum threshold. These results could be generalized to other similar districts in Zambia and the sub-region, where health systems remain focused on infectious rather than non-communicable Disease. These results should attract policy attention and potentially form the basis to review current approach to NCD care at the primary care level in Zambia and Sub-Saharan Africa.

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