Willi Mcfarland, MD, PhD, MPH

Professor

Publications
  1. Estimating the Population Size of Female Sex Workers in Namibia Using a Respondent-Driven Sampling Adjustment to the Reverse Tracking Method: A Novel Approach.
  2. High and Stable Human Immunodeficiency Virus Prevalence Among Transwomen With Low Income Recruited With Respondent-driven Sampling, San Francisco, 2010-2016.
  3. Prevalence of syphilis and related risk behaviors among women in five distinct indigenous populations in Paraguay.
  4. Increases in Pre-exposure Prophylaxis Use and Decreases in Condom Use: Behavioral Patterns Among HIV-Negative San Francisco Men Who have Sex with Men, 2004-2017.
  5. Undiagnosed and Untreated HIV Infection Among Persons Who Inject Drugs: Results of Three National HIV Behavioral Surveillance Surveys, San Francisco, 2009-2015.
  6. Prevalence and correlates of hazardous alcohol consumption and binge drinking among men who have sex with men (MSM) in San Francisco.
  7. Age at Sexual Initiation and Sexual and Health Risk Behaviors Among Jamaican Adolescents and Young Adults.
  8. Whose Responsibility Is It? Beliefs About Preventing HIV Transmission Among Men Who Have Sex With Men.
  9. Syringe Sharing in Drug Injecting Dyads: A Cross-Classified Multilevel Analysis of Social Networks.
  10. Hepatitis B Vaccination and Infection Prevalence Among Men Who Have Sex With Men Who Travel Internationally.
  11. How Many Transgender Men Are There in San Francisco?
  12. HIV Prevalence, Sexual Partners, Sexual Behavior and HIV Acquisition Risk Among Trans Men, San Francisco, 2014.
  13. Distribution of Behavioral Patterns Before Infection Among San Francisco Men Who Have Sex With Men Newly Infected With HIV in 2014.
  14. What Factors Are Associated With Receiving a Recommendation to Get Tested for HIV by Health Care Providers Among Men Who Have Sex With Men?
  15. HIV Treatment and Re-infection Beliefs Predict Sexual Risk Behavior of Men Who Have Sex With Men.
  16. High Mobility and HIV Prevalence Among Female Market Traders in East Africa in 2014.
  17. Estimated Number of People Who Inject Drugs in San Francisco, 2005, 2009, and 2012.
  18. Pre-exposure Prophylaxis (PrEP) Use, Seroadaptation, and Sexual Behavior Among Men Who Have Sex with Men, San Francisco, 2004-2014.
  19. San Franciscan MSM have similar types and numbers of partnerships with men inside San Francisco and outside San Francisco, 2011.
  20. The Impact of Discrimination on the Mental Health of Trans*Female Youth and the Protective Effect of Parental Support.
  21. Testosterone and sexual risk among transmen: a mixed methods exploratory study.
  22. HIV Serodisclosure and Sexual Behavior During International Travel.
  23. Prevalence and characteristics of users of pre-exposure prophylaxis (PrEP) among men who have sex with men, San Francisco, 2014 in a cross-sectional survey: implications for disparities.
  24. Using expert opinion to quantify unmeasured confounding bias parameters.
  25. HIV Community Viral Load and Factors Associated With Elevated Viremia Among a Community-Based Sample of Men Who Have Sex With Men in Vancouver, Canada.
  26. The importance of assessing self-reported HIV status in bio-behavioural surveys.
  27. HIV Testing and Awareness of Partner's HIV Status Among Chinese Men Who Have Sex with Men in Main Partnerships.
  28. Examining progress toward the UNAIDS 90-90-90 framework among men who have sex with men, San Francisco, 2014.
  29. Estimating Incidence of HIV Infection Among Men Who Have Sex with Men, San Francisco, 2004–2014.
  30. If You Are Not Counted, You Don't Count: Estimating the Number of African-American Men Who Have Sex with Men in San Francisco Using a Novel Bayesian Approach.
  31. Trends in sources and sharing of needles among people who inject drugs, San Francisco, 2005-2012.
  32. Brief Report: Recent Infection, Sexually Transmitted Infections, and Transmission Clusters Frequently Observed Among Persons Newly Diagnosed With HIV in San Francisco.
  33. Measuring self-reported HIV status in bio-behavioural surveys.
  34. Differential HIV risk for racial/ethnic minority trans*female youths and socioeconomic disparities in housing, residential stability, and education.
  35. Critique and lessons learned from using multiple methods to estimate population size of men who have sex with men in Ghana.
  36. Prevalence and correlates of substance use among trans female youth ages 16-24 years in the San Francisco Bay Area.
  37. Gay and bisexual men engage in fewer risky sexual behaviors while traveling internationally: a cross-sectional study in San Francisco.
  38. Who are the sexual partners of transgender individuals? Differences in demographic characteristics and risk behaviours of San Francisco HIV testing clients with transgender sexual partners compared with overall testers.
  39. Long-chain peer referral to recruit black MSM and black transgender women for an HIV vaccine efficacy trial.
  40. Prevalence, correlates and trends in seroadaptive behaviours among men who have sex with men from serial cross-sectional surveillance in San Francisco, 2004-2011.
  41. HIV prevention services and testing utilization behaviors among men who have sex with men at elevated risk for HIV in Chongqing, China.
  42. HCV, HBV, and HIV seroprevalence, coinfections, and related behaviors among male injection drug users in Arak, Iran.
  43. HIV and related risk behaviors among female sex workers in Iran: bias-adjusted estimates from the 2010 National Bio-Behavoral Survey.
  44. How can we improve online HIV and STD prevention for men who have sex with men? Perspectives of hook-up website owners, website users, and HIV/STD directors.
  45. Insight into Jordanian thinking about HIV: knowledge of Jordanian men and women about HIV prevention.
  46. Risk behaviors for HIV in sexual partnerships of San Francisco injection drug users.
  47. Comparison of HIV behavioral indicators among men who have sex with men across two survey methodologies, San Francisco, 2004 and 2008.
  48. Balancing theory and practice in respondent-driven sampling: a case study of innovations developed to overcome recruitment challenges.
  49. High burden of hepatitis B infection in Northern Uganda: results of a population-based survey.
  50. Hepatitis E virus infection in patients infected with human immunodeficiency virus in an endemic area in Iran.
  51. Measuring the unknown: calculating community viral load among HIV-infected MSM unaware of their HIV status in San Francisco from National HIV Behavioral Surveillance, 2004-2011.
  52. Convergence of HIV prevalence and inter-racial sexual mixing among men who have sex with men, San Francisco, 2004-2011.
  53. Prevalence and predictors of conscious risk behavior among San Franciscan men who have sex with men.
  54. Estimating population size, HIV prevalence and HIV incidence among men who have sex with men: a case example of synthesising multiple empirical data sources and methods in San Francisco.
  55. A new trend in the HIV epidemic among men who have sex with men, San Francisco, 2004-2011.
  56. Incorporating the service multiplier method in respondent-driven sampling surveys to estimate the size of hidden and hard-to-reach populations: case studies from around the world.
  57. Predictors of HIV testing among men who have sex with men in a large Chinese city.
  58. If the permanent deferral were lifted would men who have sex with men want to donate blood, and if so, who would be eligible?
  59. HIV voluntary counseling and testing at an abortion clinic: missed opportunities for diagnosis.
  60. Hepatitis C infection among men who have sex with men, San Francisco, 2011.
  61. Predictors of serosorting and intention to serosort among men who have sex with men, San Francisco.
  62. Participation of HIV prevention programs among men who have sex with men in two cities of China--a mixed method study.
  63. Behavior, intention or chance? A longitudinal study of HIV seroadaptive behaviors, abstinence and condom use.
  64. Evaluation of a peer network-based sexual risk reduction intervention for men in beer halls in Zimbabwe: results from a randomized controlled trial.
  65. Sentinel surveillance of HIV-1 transmitted drug resistance, acute infection and recent infection.
  66. Beyond sugar daddies: intergenerational sex and AIDS in urban Zimbabwe.
  67. Prevalence and correlates of herpes simplex virus type-2 infection among men who have sex with men, san francisco, 2008.
  68. Do rates of unprotected anal intercourse among HIV-positive MSM present a risk for hepatitis C transmission?
  69. Adolescent experiences of discrimination, harassment, connectedness to community and comfort with sexual orientation reported by adult men who have sex with men as a predictor of adult HIV status.
  70. Transmen in San Francisco: what do we know from HIV test site data?
  71. What is the potential impact of adult circumcision on the HIV epidemic among men who have sex with men in San Francisco?
  72. Accessing a diverse sample of injection drug users in San Francisco through respondent-driven sampling.
  73. HIV seroadaptation among individuals, within sexual dyads, and by sexual episodes, men who have sex with men, San Francisco, 2008.
  74. Hepatitis C prevalence among HIV-positive MSM in San Francisco: 2004 and 2008.
  75. Socioeconomic position and HIV risk-relevant behavior among lower-income heterosexuals in San Francisco.
  76. Behavioral surveillance of heterosexual exchange-sex partnerships in San Francisco: context, predictors and implications.
  77. Racial/Ethnic differences in seroadaptive and serodisclosure behaviors among men who have sex with men.
  78. Seroadaptive behaviours among men who have sex with men in San Francisco: the situation in 2008.
  79. Comparing respondent-driven sampling and targeted sampling methods of recruiting injection drug users in San Francisco.
  80. Prevalence and correlates of co-infection with human immunodeficiency virus and hepatitis C virus in male injection drug users in Iran.
  81. Decreases in community viral load are accompanied by reductions in new HIV infections in San Francisco.
  82. High prevalence of chronic hepatitis B infection among injection drug users in Iran: the need to increase vaccination of adults at risk.
  83. Prevalence and correlates of hepatitis C infection among male injection drug users in detention, Tehran, Iran.
  84. Recent HIV-1 infection detection: comparison of incidence estimates derived by laboratory assays and repeat testing data.
  85. Racial mixing and HIV risk among men who have sex with men.
  86. HIV risk behaviors in heterosexual partnerships: female knowledge and male behavior.
  87. An examination of the rates of receptive anal intercourse among Asian/Pacific Islander men who have sex with men in San Francisco.
  88. Hepatitis B sero-prevalence and risk behaviors among immigrant men in a population-based household survey in low-income neighborhoods of northern California.
  89. Estimation of HIV incidence in San Francisco.
  90. Comparing internet-based and venue-based methods to sample MSM in the San Francisco Bay Area.
  91. Frequent international travel by men who have sex with men recently diagnosed with HIV-1: potential for transmission of primary HIV-1 drug resistance.
  92. Locating unrecognized HIV infections among men who have sex with men: San Francisco and Los Angeles.
  93. Use of sentinel surveillance and geographic information systems to monitor trends in HIV prevalence, incidence, and related risk behavior among women undergoing syphilis screening in a jail setting.
  94. Sexual compulsiveness and change in unprotected anal intercourse: unexpected results from a randomized controlled HIV counseling intervention study.
  95. An empirical comparison of respondent-driven sampling, time location sampling, and snowball sampling for behavioral surveillance in men who have sex with men, Fortaleza, Brazil.
  96. Increasing HIV prevalence among drug users in western Guangdong province, China, 1995-2005.
  97. The Internet, HIV serosorting and transmission risk among men who have sex with men, San Francisco.
  98. HIV prevalence and correlates of unprotected anal intercourse among men who have sex with men, Jinan, China.
  99. Same race and older partner selection may explain higher HIV prevalence among black men who have sex with men.
  100. Trends in prevalence of HIV, syphilis, hepatitis C, hepatitis B, and sexual risk behavior among men who have sex with men. Results of 3 consecutive respondent-driven sampling surveys in Beijing, 2004 through 2006.
  101. Trends in sexually transmitted diseases, sexual risk behavior, and HIV infection among Asian/Pacific Islander men who have sex with men, San Francisco, 1999-2005.
  102. Prevalence of HIV infection and predictors of high-transmission sexual risk behaviors among men who have sex with men.
  103. Brief cognitive counseling with HIV testing to reduce sexual risk among men who have sex with men: results from a randomized controlled trial using paraprofessional counselors.
  104. Indicators of use of methamphetamine and other substances among men who have sex with men, San Francisco, 2003-2006.
  105. Estimating HIV incidence in voluntary counseling and testing clients in Uganda (1992-2003).
  106. Routine surveillance for the detection of acute and recent HIV infections and transmission of antiretroviral resistance.
  107. Assessing the feasibility of harm reduction services for MSM: the late night breakfast buffet study.
  108. A population-based study on alcohol and high-risk sexual behaviors in Botswana.
  109. Contraceptive intentions among adolescents after abortion.
  110. Elevated risk of death for African Americans with AIDS, San Francisco, 1996-2002.
  111. How well do trends in HIV prevalence in young people reflect HIV incidence? Results from 10 years of HIV serosurveillance in San Francisco.
  112. Associations between substance use and sexual risk among very young men who have sex with men.
  113. Prevalence and correlates of substance use among young Asian Pacific Islander men who have sex with men.
  114. HIV testing patterns and unrecognized HIV infection among young Asian and Pacific Islander men who have sex with men in San Francisco.
  115. Amphetamine use is associated with increased HIV incidence among men who have sex with men in San Francisco.
  116. HIV sentinel surveillance among women seeking elective pregnancy termination, San Francisco.
  117. Comparison of three methods to measure HIV incidence among persons seeking voluntary, anonymous counseling and testing.
  118. Acceptability of adult male circumcision for sexually transmitted disease and HIV prevention in Zimbabwe.
  119. High level of hepatitis B infection and ongoing risk among Asian/Pacific Islander men who have sex with men, San Francisco, 2000-2001.
  120. HIV seroconversion among the homeless and marginally housed in San Francisco: a ten-year study.
  121. Persistent HIV incidence among injection drug users in San Francisco during the 1990s: results of five studies.
  122. Trends in HIV prevalence among public sexually transmitted disease clinic attendees in the Western region of the United States (1989-1999).
  123. An opportunity for prevention: prevalence, incidence, and sexual risk for HIV among young Asian and Pacific Islander men who have sex with men, San Francisco.
  124. The bisexual bridge revisited: sexual risk behavior among men who have sex with men and women, San Francisco, 1998-2003.
  125. HIV prevention fatigue among high-risk populations in San Francisco.
  126. Gay Asian men in San Francisco follow the international trend: increases in rates of unprotected anal intercourse and sexually transmitted diseases, 1999-2002.
  127. Low incidence and prevalence of hepatitis C virus infection among sexually active non-intravenous drug-using adults, San Francisco, 1997-2000.
  128. Provision of syndromic treatment of sexually transmitted infections by community pharmacists: a potentially underutilized HIV prevention strategy.
  129. Unprotected anal intercourse between potentially HIV-serodiscordant men who have sex with men, San Francisco.
  130. Viagra use in a community-recruited sample of men who have sex with men, San Francisco.
  131. Low socioeconomic status is associated with a higher rate of death in the era of highly active antiretroviral therapy, San Francisco.
  132. Incidence and prevalence of herpes simplex virus type 2 infection in persons seeking repeat HIV counseling and testing.
  133. Self-reported sexual identity, sexual behaviors and health risks.
  134. Risk of HIV infection attributable to oral sex among men who have sex with men and in the population of men who have sex with men.
  135. Characterization of sexually transmitted disease clinic patients with recent human immunodeficiency virus infection.
  136. Continuing increases in sexual risk behavior and sexually transmitted diseases among men who have sex with men: San Francisco, Calif, 1999-2001, USA.
  137. Changing sexual behavior among gay male repeat testers for HIV: a randomized, controlled trial of a single-session intervention.
  138. Hepatitis C virus infection in young, low-income women: the role of sexually transmitted infection as a potential cofactor for HCV infection.