T. Charles Witzel

ORCID: 0000-0003-4262-261X
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Research Areas
  • HIV/AIDS Research and Interventions
  • HIV, Drug Use, Sexual Risk
  • HIV Research and Treatment
  • LGBTQ Health, Identity, and Policy
  • Sexuality, Behavior, and Technology
  • Sex work and related issues
  • Adolescent Sexual and Reproductive Health
  • Digital Mental Health Interventions
  • Gender, Feminism, and Media
  • HIV/AIDS drug development and treatment
  • African Sexualities and LGBTQ+ Issues
  • HIV-related health complications and treatments
  • Hepatitis C virus research
  • Poxvirus research and outbreaks
  • COVID-19 and Mental Health
  • Bacillus and Francisella bacterial research
  • Herpesvirus Infections and Treatments
  • COVID-19 Impact on Reproduction
  • Ethics in Clinical Research
  • Syphilis Diagnosis and Treatment
  • Mobile Health and mHealth Applications
  • Health Policy Implementation Science
  • Feminism, Gender, and Sexuality Studies
  • Mental Health and Patient Involvement

London School of Hygiene & Tropical Medicine
2014-2024

Faculty of Public Health
2016-2024

University College London
2022-2024

Mahidol University
2023-2024

The Royal Free Hospital
2022-2024

Royal Society of Tropical Medicine and Hygiene
2020-2023

UK Health Security Agency
2022

MRC Clinical Trials Unit at UCL
2022

King's College Hospital
2022

Sigma Research (United States)
2017-2019

BackgroundThe 2022–2024 global mpox outbreak, occurring primarily in the sexual networks of gay, bisexual and other men who have sex with (GBMSM), has not been accompanied by a focus on patient perspectives illness. We explore experiences GBMSM diagnosed England to understand needs for social clinical support.MethodsIn-depth interviews (March/July 2023) were conducted 22 2022, randomly selected from national surveillance database, 4 stakeholders clinical/community-based organisations....

10.1016/j.eclinm.2024.102522 article EN cc-by EClinicalMedicine 2024-03-12

Introduction Innovative strategies, such as HIV self-testing (HIVST), could increase testing rates and diagnosis. Evidence to inform the design of an HIVST intervention in UK is scarce with very little European data on this topic. This study aims understand values preferences for interventions targeting MSM UK. We explore acceptability among context known barriers facilitators HIV; assess for, concerns about, HIVST. Methods Six focus group discussions (FGD) were conducted 47 London,...

10.1371/journal.pone.0162713 article EN cc-by PLoS ONE 2016-09-09

The British HIV Association's (BHIVA) testing guidelines recommend men who have sex with (MSM) test annually or more frequently if ongoing risk is present. We identify which groups of MSM in England are less likely to tested for and their preferences future tests by model, order inform health promotion programmes.Data come from the Gay Men's Sex Survey 2014, a cross-sectional survey MSM, aged 16 years older living UK. Only did not diagnosed were included this analysis. used logistic...

10.1136/bmjopen-2016-011372 article EN cc-by-nc BMJ Open 2016-09-01

Transgender, or trans, people experience a number of barriers to accessing gender-affirming healthcare and have range facilitators primary care specialist services, commonly citing discrimination cisgenderism playing central role in shaping accessibility. The pathway through services is particularly precarious time for trans people, misinformation poorly applied protocols can detrimental impact on wellbeing.

10.1186/s12913-021-06661-4 article EN cc-by BMC Health Services Research 2021-06-28

HIV self-testing (HIVST) could play an important role in improving access to testing and therefore reducing inequalities related late diagnosis of HIV, while also prevention interventions such as pre-exposure prophylaxis. This study sought understand the potential HIVST by exploring experiences Asian, Black Latin American men who have sex with (MSM) accessing gay scene circulation norms; services; acceptability preferences for intervention adaptations.Twenty-nine qualitative interviews were...

10.1186/s12889-022-13189-7 article EN cc-by BMC Public Health 2022-04-22

This article details the preliminary findings from Porn Laid Bare, a collaborative research project between University of Sussex and Terrence Higgins Trust, Brighton. We explore multidimensional relationship that respondents identified as having formed with pornographic material, together its role within gay male subculture. then consider how interview understood conceptualised bareback pornography. Our reveal consistent contradictions general discussions pornography specific...

10.1177/1363460713487370 article EN Sexualities 2013-08-30

BackgroundGlobally, trans people are disproportionately affected by HIV, but research on strategies to increase testing limited. SELPHI is a randomised-controlled-trial (RCT) of 10,135 cis men, and women reporting lifetime anal intercourse with male partners (cis or trans), evaluating whether the offer free HIV self-testing (HIVST) increases diagnosis. This subgroup analysis from RCT aims describe key HIVST outcomes acceptability for people.MethodsSELPHI recruited using social networking...

10.1016/j.eclinm.2020.100700 article EN cc-by-nc-nd EClinicalMedicine 2021-02-01

Ethnic and sexual minority groups are underserved by mental health services globally despite having potentially greater need. This study aimed to explore how the intersections between orientation ethnicity shape experiences service access for Asian, Black Latin American men who have sex with (MSM) in UK. research was drawn from a qualitative sub-study of larger HIV self-testing randomised controlled trial (SELPHI). Cis-gender Black, Asian MSM participated SELPHI were recruited purposively...

10.1371/journal.pmen.0000231 article EN cc-by PLOS mental health. 2025-03-27

Background Black men who have sex with (BMSM) higher HIV incidence and prevalence when compared other men, despite similar risk profiles. New prevention technologies, including pre-exposure prophylaxis (PrEP), may be effective in responding to these inequalities, provided they are appropriately targeted acceptable their intended beneficiaries. This study aims understand the motivations barriers of BMSM aged 18–45 PrEP uptake. Methods Twenty-five recruited through geolocation social...

10.1136/sextrans-2018-053773 article EN cc-by Sexually Transmitted Infections 2019-03-04

Objectives SELPHI (HIV Self‐Testing Public Health Intervention) is the largest randomized controlled trial (RCT) of HIV self‐testing (HIVST) in a high‐income setting to date, and has recruited 10 000 men who have sex with (cis‐ transgender) transgender women men. This qualitative substudy aimed explore how those utilizing self‐tests experience HIVST implications for further intervention development scale‐up. first study Europe investigating experiences among users, globally examining using...

10.1111/hiv.12818 article EN cc-by HIV Medicine 2019-12-10

The SELPHI study (An HIV Self-Testing Public Health Intervention) is an online randomised controlled trial (RCT) of self-testing (HIVST). aim this was to assess the feasibility recruiting UK men who have sex with (cis and trans) trans women pilot, acceptability HIVST intervention used among those receive a kit.

10.1186/s12879-019-4247-1 article EN cc-by BMC Infectious Diseases 2019-08-07

HIV testing has seen a rapid evolution over the last decade with multiple modalities now in use globally. In recent years self-testing (HIVST) been legalised UK paving way for further expansion of testing. Interventions are delivered particular social contexts which shape uptake. It is therefore important to understand how novel interventions likely be received by their intended users. This study aims HIVST compliments existing strategies considered or adopted men who have sex (MSM). We do...

10.1186/s12889-017-4370-0 article EN cc-by BMC Public Health 2017-05-22

Hepatitis C (HCV) diagnosis and care is a major challenge for people who use illicit drugs, characterised by low rates of testing treatment engagement globally. New approaches to fostering are needed. We explored the acceptability remote forms HCV including self-testing self-sampling among drugs in London, UK.A qualitative rapid assessment was undertaken with stakeholders UK. Focus groups were held men have sex engaged drug use, currently inject formerly injected (22 participants across 3...

10.1186/s12879-018-3185-7 article EN cc-by BMC Infectious Diseases 2018-06-19

Background As efforts continue to increase rates of HIV testing and condom use among at-risk communities in England, organisations have sought social media for health promotion interventions. part a wider evaluation It Starts With Me (ISWM), sexual intervention England targeting gay bisexual men African people through Facebook, this study explore how the online environment shapes end user engagement with A primary objective was privacy concerns can act as barrier audience ISWM. Methods:...

10.1071/sh15231 article EN Sexual Health 2016-01-01

Among men who have sex with (MSM) in the UK, an estimated 28% never tested for HIV and only 27% of those at higher risk test least every 6 months. self-testing (HIVST), where person takes their own blood/saliva sample processes it themselves, offers opportunity to remove many structural social barriers testing. Although several randomised controlled trials are assessing impact providing HIVST on rates testing, none addressing whether this results increased diagnoses that link clinical care....

10.1186/s12879-018-3433-x article EN cc-by BMC Infectious Diseases 2018-10-23

Since the late 1990s, use of condoms within gay male pornography has been on wane. Moving from a niche category into more mainstream forms commercial pornography, unprotected anal sex become dominant theme this sphere sexual representation. However, while definition what constitutes bareback may at first sight appear unproblematic, article argues that meanings and understandings intercourse (UAI) are not constant across all genres pornography. Using textual analysis focus group methods,...

10.1080/00918369.2014.928581 article EN Journal of Homosexuality 2014-07-28
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