Waimar Tun

Dados Biográficos

ID	6652371
NOME	Waimar Tun
PRENOMES	Waimar
SOBRENOME	Tun
ASSINATURA	TUN W
AFILIAÇÕES	Population Council
ORCID	0000-0002-4543-7025
VERIFICADO	Sim
TOTAL DE OBRAS	25
TOTAL DE CITAÇÕES	9
TOTAL COMO AUTOR	25
TOTAL COMO EDITOR	0
PRIMEIRO ANO DE PUBLICAÇÃO	2000
ANO MAIS RECENTE DE PUBLICAÇÃO	2025
ÍNDICE H	1

“Let’s chat!” Piloting a digital chatbot for HIV prevention among cisgender women and transgender men in Nigeria
Open AccessS Mathur, Anita Fernandez Eromhonsele et al.ARTICLEAIDS Care2025
Awareness and uptake of HIV pre-exposure prophylaxis (PrEP), a highly efficacious medication for HIV prevention, remains low in many sub-Saharan African countries. This study explored the acceptability and feasibility of an HIV prevention chatbot tailored for cisgender women and transgender men in Lagos, Nigeria. The chatbot was developed and implemented in the Nigerian healthcare context using participatory approaches engaging HIV healthcare pro…
From Tanzania to Washington, DC
Open AccessWaimar Tun, Jennifer Gomez-Berrospi et al.ARTICLEAIDS and Behavior2025
Biobehavioral survey using time location sampling among female sex workers living in Ghana in 2020
Open AccessSamuel Dery, Chris Guure et al.ARTICLEFrontiers in Public Health2024
Background: The HIV epidemic in Ghana is characterized as a mix of a low-level generalized epidemic with significant contributions from transmission among female sex workers (FSW) and their clients. This study seeks to identify and describe key characteristics and sexual behaviors of FSW and estimate the prevalence of HIV, syphilis, gonorrhea, chlamydia, and hepatitis B virus (HBV) among FSW in Ghana. Method: A total of 7,000 FSW were recruited f…
Policymakers’ and healthcare providers’ perspectives on the introduction of oral pre-exposure prophylaxis for key populations in Ghana
Open AccessHenry Nagai, Edward Adiibokah et al.ARTICLEBMC Public Health2023
Policymakers and providers recognize the value of PrEP in cubing new HIV infections but have concerns about disinhibition, non-adherence, and cost. Therefore, the Ghana health service should roll-out a range of strategies to address their concerns including: sensitization with providers to mitigate underlying stigma towards KPs, particularly MSM, integration of PrEP into existing services, and innovative strategies to improve continued use of PrE…
Quality of Care is Perceived to be High with Community-based Antiretroviral Therapy (ART) Services for Female Sex Workers in Tanzania
Open AccessWaimar Tun, Donaldson F Conserve et al.ARTICLEAIDS and Behavior2023
This qualitative study reports on female sex workers' (FSWs) perceptions of the quality of antiretroviral therapy (ART) services they received as part of a community-based ART distribution intervention compared to services received by FSWs in the standard of care (SOC) arm. In-depth interviews were conducted with 24 participants to explore their perceptions of the quality of ART services. Data was analyzed using a quality-of-care framework that i…
Operationalizing the distribution of oral HIV self-testing kits to men who have sex with men (MSM) in a highly homophobic environment
Open AccessAdekemi Sekoni, Waimar Tun et al.ARTICLEBMC Public Health2022
This study showed the practical steps involved in operationalizing KOL support system distribution of HIVST that positively influenced the testing experience for the participants irrespective of the HIV status and engagement in care. KOLs are a reliable resource to leverage for ensuring that HIV self-test kit is utilized and HIV positive individuals are linked to treatment and care in homophobic environments
Perspectives of Policymakers on the Introduction and Scale-Up of HIV Self-Testing and Implication for National HIV Programming in Ghana
Open AccessHenry Nagai, Henry Tagoe et al.ARTICLEFrontiers in Public Health2021
Background: HIV self-testing (HIVST) has the potential to greatly increase HIV testing uptake, particularly among key populations (KPs) at higher risk for HIV. Studies have shown high acceptability and feasibility of HIVST among various target populations globally. However, less is known about the perspectives of policymakers, who are critical to the success of HIVST implementation. Their views on barriers to the introduction and scale-up of self…
Community-based antiretroviral therapy (ART) delivery for female sex workers in Tanzania
Open AccessLung Vu, Waimar Tun et al.ARTICLEAIDS Care2020
To increase linkage to and retention in antiretroviral therapy (ART) care, we piloted a community-based, ART service delivery intervention for female sex workers (FSWs). At baseline, we recruited and collected data from 617 FSWs (intervention: 309; comparison: 308) who were HIV positive and not on ART. This paper presents (1) the description of the intervention model, and (2) key descriptive and bivariate-level findings of the baseline FSW cohort…
Quality of care and HIV service utilization among key populations in Zambia
Nanlesta Pilgrim, Maurice Musheke et al.ARTICLEAIDS Care2019
HIV epidemic control requires improving access and uptake of HIV services by key populations (KPs). In Zambia, the behaviors of female sex workers (FSWs), men who have sex with men (MSM), and people of who use drugs (PWUD) are criminalized, and little information exists about their HIV/STI service use. Using a quality of care (QOC) framework, we compared barriers to and opportunities for HIV/STI service access and uptake among the three KPs. We c…
Community-Based Antiretroviral Therapy (ART) Delivery for Female Sex Workers in Tanzania
Open AccessWaimar Tun, Lou Apicella et al.ARTICLEAIDS and Behavior2019
We conducted an implementation science study of a community-based ART distribution program for HIV-positive female sex workers (FSW) whereby clients received ART services through community-based mobile and home-based platforms. We compared 6-month treatment-related outcomes in the community-based ART arm (N = 256) to the standard facility-based ART delivery arm (N = 253). Those in the intervention arm were more likely to have initiated ART (100.0…
HIV, Hepatitis B and C among people who inject drugs
Open AccessLopamudra Ray Saraswati, Avina Sarna et al.ARTICLEBMC Public Health2015
We report a high prevalence of HIV, HCV and HIV-HCV co-infection among male PWIDs in Delhi. A tenth of the participants were HBsAg positive. Targeted Intervention programs should make HBV/HCV testing, prevention and care more accessible for PWIDs
Women at risk’
Vartika Sharma, Avina Sarna et al.ARTICLECulture Health & Sexuality2015
Needle and syringe sharing is common among people who inject drugs and so is unprotected sex, which consequently puts their sex partners at risk of sexually transmitted infections (STIs) including HIV and other blood-borne infections, like hepatitis. We undertook a nested study with the regular female partners of men who inject drugs participating in a longitudinal HIV incidence study in Delhi, India. In-depth interviews were conducted with femal…
High levels of bisexual behavior and factors associated with bisexual behavior among men having sex with men (MSM) in Nigeria
Meredith Sheehy, Waimar Tun et al.ARTICLEAIDS Care2014
Nigerian men who have sex with men (MSM) have a high burden of HIV infection and are known to engage in bisexual behavior. This study presents the first data on characteristics and correlates of Nigerian men having sex with men and women (MSMW) in three Nigerian cities. Five hundred and fifty-seven MSM who engaged in anal sex with men completed a behavioral survey; 48.1% of these MSM also engaged in sex with women in the previous 2 months. MSMW d…
Factors Associated with Acceptability of HIV Self-Testing Among Health Care Workers in Kenya
Open AccessSamuel Kalibala, Waimar Tun et al.ARTICLEAIDS and Behavior2014
Prevalence of HIV, Sexually Transmitted Infections, and Risk Behaviours Among Female Sex Workers in Nairobi, Kenya
Open AccessHelgar Musyoki, Timothy A Kellogg et al.ARTICLEAIDS and Behavior2014
HIV and STI Prevalence and Injection Behaviors Among People Who Inject Drugs in Nairobi
Open AccessWaimar Tun, Meredith Sheehy et al.ARTICLEAIDS and Behavior2014
There is a dearth of evidence on injection drug use and associated HIV infections in Kenya. To generate population-based estimates of characteristics and HIV/STI prevalence among people who inject drugs (PWID) in Nairobi, a cross-sectional study was conducted with 269 PWID using respondent-driven sampling. PWID were predominantly male (92.5 %). An estimated 67.3 % engaged in at least one risky injection practice in a typical month. HIV prevalence…
Using a 2-Stage Strategy with Respondent-Driven Sampling to Recruit a Hard-to-Reach Population for a Placebo Microbicide Gel Clinical Trial in Nellore, Andhra Pradesh (India)
Open AccessWaimar Tun, Lauren L Katzen et al.ARTICLEAIDS and Behavior2014
High Uptake of HIV Testing in a Cohort of Male Injection Drug Users in Delhi, India
Open AccessAvina Sarna, Waimar Tun et al.ARTICLEAIDS and Behavior2013
An Evaluation of Methods to Improve the Reporting of Adherence in a Placebo Gel Trial in Andhra Pradesh, India
Open AccessSharon A Abbott, Barbara Friedland et al.ARTICLEAIDS and Behavior2013
HIV-related conspiracy beliefs and its relationships with HIV testing and unprotected sex among men who have sex with men in Tshwane (Pretoria), South Africa
Waimar Tun, Scott Kellerman et al.ARTICLEAIDS Care2012
The objective of this study was to determine extent of HIV conspiracy belief endorsement among men who have sex with men (MSM) in Pretoria, and assess whether endorsement of HIV conspiracy beliefs are associated with inconsistent condom use and never testing for HIV. A cross-sectional survey using respondent-driven sampling was conducted between February and August 2009. A high proportion of respondents endorsed HIV conspiracy beliefs. MSM common…
Characteristics of Female Sex Workers in Southern India Willing and Unwilling to Participate in a Placebo Gel Trial
Open AccessBarbara S Mensch, Barbara Friedland et al.ARTICLEAIDS and Behavior2012
Attitudinal and Behavioral Factors Associated with Extramarital Sex Among Nigerian Men
Lung Vu, Waimar Tun et al.ARTICLEInternational Journal of Sexual…2011
Using couple data from a national survey, this article examines couple's characteristics associated with extramarital sex among Nigerian men. We found 15.4% of married men had extramarital sex in the past 12 months. Extramarital sex was significantly associated with men's attitude toward extramarital sex (OR = 1.7 [1.4–3.0]), early sexual debut (OR = 1.9 [1.6–2.3]), alcohol use (OR = 1.7 [1.4–2.1]), and intimate partner violence against wife (IPV…
Levels and Correlates of Internalized Homophobia Among Men Who Have Sex with Men in Pretoria, South Africa
Open AccessLung Vu, Waimar Tun et al.ARTICLEAIDS and Behavior2011
An Analysis of Respondent Driven Sampling with Injection Drug Users (IDU) in Albania and the Russian Federation
Open AccessAme Stormer, Waimar Tun et al.ARTICLEJournal of Urban Health2006Citada por: 9Referências: 1
Injection drug users in Tirana, Albania and St. Petersburg, Russia were recruited into a study assessing HIV-related behaviors and HIV serostatus using Respondent Driven Sampling (RDS), a peer-driven recruitment sampling strategy that results in a probability sample. (Salganik M, Heckathorn DD. Sampling and estimation in hidden populations using respondent-driven sampling. Sociol Method. 2004;34:193-239). This paper presents a comparison of RDS i…
Decline in Self-Reported High-Risk Injection-Related Behaviors Among HIV-Seropositive Participants in the Baltimore Needle Exchange Program
Open AccessJohn Vertefeuille, Melissa Ann Marx et al.ARTICLEAIDS and Behavior2000

Decline in Self-Reported High-Risk Injection-Related Behaviors Among HIV-Seropositive Participants in the Baltimore Needle Exchange Program
Open AccessJohn Vertefeuille, Melissa Ann Marx et al.ARTICLEAIDS and Behavior2000
An Analysis of Respondent Driven Sampling with Injection Drug Users (IDU) in Albania and the Russian Federation
Open AccessAme Stormer, Waimar Tun et al.ARTICLEJournal of Urban Health2006Citada por: 9Referências: 1
Injection drug users in Tirana, Albania and St. Petersburg, Russia were recruited into a study assessing HIV-related behaviors and HIV serostatus using Respondent Driven Sampling (RDS), a peer-driven recruitment sampling strategy that results in a probability sample. (Salganik M, Heckathorn DD. Sampling and estimation in hidden populations using respondent-driven sampling. Sociol Method. 2004;34:193-239). This paper presents a comparison of RDS i…
Attitudinal and Behavioral Factors Associated with Extramarital Sex Among Nigerian Men
Lung Vu, Waimar Tun et al.ARTICLEInternational Journal of Sexual…2011
Using couple data from a national survey, this article examines couple's characteristics associated with extramarital sex among Nigerian men. We found 15.4% of married men had extramarital sex in the past 12 months. Extramarital sex was significantly associated with men's attitude toward extramarital sex (OR = 1.7 [1.4–3.0]), early sexual debut (OR = 1.9 [1.6–2.3]), alcohol use (OR = 1.7 [1.4–2.1]), and intimate partner violence against wife (IPV…
Levels and Correlates of Internalized Homophobia Among Men Who Have Sex with Men in Pretoria, South Africa
Open AccessLung Vu, Waimar Tun et al.ARTICLEAIDS and Behavior2011
HIV-related conspiracy beliefs and its relationships with HIV testing and unprotected sex among men who have sex with men in Tshwane (Pretoria), South Africa
Waimar Tun, Scott Kellerman et al.ARTICLEAIDS Care2012
The objective of this study was to determine extent of HIV conspiracy belief endorsement among men who have sex with men (MSM) in Pretoria, and assess whether endorsement of HIV conspiracy beliefs are associated with inconsistent condom use and never testing for HIV. A cross-sectional survey using respondent-driven sampling was conducted between February and August 2009. A high proportion of respondents endorsed HIV conspiracy beliefs. MSM common…
Characteristics of Female Sex Workers in Southern India Willing and Unwilling to Participate in a Placebo Gel Trial
Open AccessBarbara S Mensch, Barbara Friedland et al.ARTICLEAIDS and Behavior2012
High Uptake of HIV Testing in a Cohort of Male Injection Drug Users in Delhi, India
Open AccessAvina Sarna, Waimar Tun et al.ARTICLEAIDS and Behavior2013
An Evaluation of Methods to Improve the Reporting of Adherence in a Placebo Gel Trial in Andhra Pradesh, India
Open AccessSharon A Abbott, Barbara Friedland et al.ARTICLEAIDS and Behavior2013
High levels of bisexual behavior and factors associated with bisexual behavior among men having sex with men (MSM) in Nigeria
Meredith Sheehy, Waimar Tun et al.ARTICLEAIDS Care2014
Nigerian men who have sex with men (MSM) have a high burden of HIV infection and are known to engage in bisexual behavior. This study presents the first data on characteristics and correlates of Nigerian men having sex with men and women (MSMW) in three Nigerian cities. Five hundred and fifty-seven MSM who engaged in anal sex with men completed a behavioral survey; 48.1% of these MSM also engaged in sex with women in the previous 2 months. MSMW d…
Factors Associated with Acceptability of HIV Self-Testing Among Health Care Workers in Kenya
Open AccessSamuel Kalibala, Waimar Tun et al.ARTICLEAIDS and Behavior2014
Prevalence of HIV, Sexually Transmitted Infections, and Risk Behaviours Among Female Sex Workers in Nairobi, Kenya
Open AccessHelgar Musyoki, Timothy A Kellogg et al.ARTICLEAIDS and Behavior2014
HIV and STI Prevalence and Injection Behaviors Among People Who Inject Drugs in Nairobi
Open AccessWaimar Tun, Meredith Sheehy et al.ARTICLEAIDS and Behavior2014
There is a dearth of evidence on injection drug use and associated HIV infections in Kenya. To generate population-based estimates of characteristics and HIV/STI prevalence among people who inject drugs (PWID) in Nairobi, a cross-sectional study was conducted with 269 PWID using respondent-driven sampling. PWID were predominantly male (92.5 %). An estimated 67.3 % engaged in at least one risky injection practice in a typical month. HIV prevalence…
Using a 2-Stage Strategy with Respondent-Driven Sampling to Recruit a Hard-to-Reach Population for a Placebo Microbicide Gel Clinical Trial in Nellore, Andhra Pradesh (India)
Open AccessWaimar Tun, Lauren L Katzen et al.ARTICLEAIDS and Behavior2014
HIV, Hepatitis B and C among people who inject drugs
Open AccessLopamudra Ray Saraswati, Avina Sarna et al.ARTICLEBMC Public Health2015
We report a high prevalence of HIV, HCV and HIV-HCV co-infection among male PWIDs in Delhi. A tenth of the participants were HBsAg positive. Targeted Intervention programs should make HBV/HCV testing, prevention and care more accessible for PWIDs
Women at risk’
Vartika Sharma, Avina Sarna et al.ARTICLECulture Health & Sexuality2015
Needle and syringe sharing is common among people who inject drugs and so is unprotected sex, which consequently puts their sex partners at risk of sexually transmitted infections (STIs) including HIV and other blood-borne infections, like hepatitis. We undertook a nested study with the regular female partners of men who inject drugs participating in a longitudinal HIV incidence study in Delhi, India. In-depth interviews were conducted with femal…
Quality of care and HIV service utilization among key populations in Zambia
Nanlesta Pilgrim, Maurice Musheke et al.ARTICLEAIDS Care2019
HIV epidemic control requires improving access and uptake of HIV services by key populations (KPs). In Zambia, the behaviors of female sex workers (FSWs), men who have sex with men (MSM), and people of who use drugs (PWUD) are criminalized, and little information exists about their HIV/STI service use. Using a quality of care (QOC) framework, we compared barriers to and opportunities for HIV/STI service access and uptake among the three KPs. We c…
Community-Based Antiretroviral Therapy (ART) Delivery for Female Sex Workers in Tanzania
Open AccessWaimar Tun, Lou Apicella et al.ARTICLEAIDS and Behavior2019
We conducted an implementation science study of a community-based ART distribution program for HIV-positive female sex workers (FSW) whereby clients received ART services through community-based mobile and home-based platforms. We compared 6-month treatment-related outcomes in the community-based ART arm (N = 256) to the standard facility-based ART delivery arm (N = 253). Those in the intervention arm were more likely to have initiated ART (100.0…
Community-based antiretroviral therapy (ART) delivery for female sex workers in Tanzania
Open AccessLung Vu, Waimar Tun et al.ARTICLEAIDS Care2020
To increase linkage to and retention in antiretroviral therapy (ART) care, we piloted a community-based, ART service delivery intervention for female sex workers (FSWs). At baseline, we recruited and collected data from 617 FSWs (intervention: 309; comparison: 308) who were HIV positive and not on ART. This paper presents (1) the description of the intervention model, and (2) key descriptive and bivariate-level findings of the baseline FSW cohort…
Perspectives of Policymakers on the Introduction and Scale-Up of HIV Self-Testing and Implication for National HIV Programming in Ghana
Open AccessHenry Nagai, Henry Tagoe et al.ARTICLEFrontiers in Public Health2021
Background: HIV self-testing (HIVST) has the potential to greatly increase HIV testing uptake, particularly among key populations (KPs) at higher risk for HIV. Studies have shown high acceptability and feasibility of HIVST among various target populations globally. However, less is known about the perspectives of policymakers, who are critical to the success of HIVST implementation. Their views on barriers to the introduction and scale-up of self…
Operationalizing the distribution of oral HIV self-testing kits to men who have sex with men (MSM) in a highly homophobic environment
Open AccessAdekemi Sekoni, Waimar Tun et al.ARTICLEBMC Public Health2022
This study showed the practical steps involved in operationalizing KOL support system distribution of HIVST that positively influenced the testing experience for the participants irrespective of the HIV status and engagement in care. KOLs are a reliable resource to leverage for ensuring that HIV self-test kit is utilized and HIV positive individuals are linked to treatment and care in homophobic environments
Policymakers’ and healthcare providers’ perspectives on the introduction of oral pre-exposure prophylaxis for key populations in Ghana
Open AccessHenry Nagai, Edward Adiibokah et al.ARTICLEBMC Public Health2023
Policymakers and providers recognize the value of PrEP in cubing new HIV infections but have concerns about disinhibition, non-adherence, and cost. Therefore, the Ghana health service should roll-out a range of strategies to address their concerns including: sensitization with providers to mitigate underlying stigma towards KPs, particularly MSM, integration of PrEP into existing services, and innovative strategies to improve continued use of PrE…
Quality of Care is Perceived to be High with Community-based Antiretroviral Therapy (ART) Services for Female Sex Workers in Tanzania
Open AccessWaimar Tun, Donaldson F Conserve et al.ARTICLEAIDS and Behavior2023
This qualitative study reports on female sex workers' (FSWs) perceptions of the quality of antiretroviral therapy (ART) services they received as part of a community-based ART distribution intervention compared to services received by FSWs in the standard of care (SOC) arm. In-depth interviews were conducted with 24 participants to explore their perceptions of the quality of ART services. Data was analyzed using a quality-of-care framework that i…
Biobehavioral survey using time location sampling among female sex workers living in Ghana in 2020
Open AccessSamuel Dery, Chris Guure et al.ARTICLEFrontiers in Public Health2024
Background: The HIV epidemic in Ghana is characterized as a mix of a low-level generalized epidemic with significant contributions from transmission among female sex workers (FSW) and their clients. This study seeks to identify and describe key characteristics and sexual behaviors of FSW and estimate the prevalence of HIV, syphilis, gonorrhea, chlamydia, and hepatitis B virus (HBV) among FSW in Ghana. Method: A total of 7,000 FSW were recruited f…
“Let’s chat!” Piloting a digital chatbot for HIV prevention among cisgender women and transgender men in Nigeria
Open AccessS Mathur, Anita Fernandez Eromhonsele et al.ARTICLEAIDS Care2025
Awareness and uptake of HIV pre-exposure prophylaxis (PrEP), a highly efficacious medication for HIV prevention, remains low in many sub-Saharan African countries. This study explored the acceptability and feasibility of an HIV prevention chatbot tailored for cisgender women and transgender men in Lagos, Nigeria. The chatbot was developed and implemented in the Nigerian healthcare context using participatory approaches engaging HIV healthcare pro…
From Tanzania to Washington, DC
Open AccessWaimar Tun, Jennifer Gomez-Berrospi et al.ARTICLEAIDS and Behavior2025