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Marvin E. Belzer, MD

Professor of Clinical Pediatrics and Medicine

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Phone +1 323 361 4758
Email mbelzer@chla.usc.edu
CTSI Profile

Overview

Involved in many aspect of adolescent HIV including clinical trials, adherence, secondary prevention. Have conducted research on adherence to contraception and utilization of emergency contraception. Lastly, I am conducting research on HIV prevention and healthcare for youth with gender identity disorder.

Expert in adolescent medicine, especially HIV/AIDS, sexuality, gender identity, and chronic fatigue syndrome

Publications

  • An Adaptive Antiretroviral Therapy Adherence Intervention for Youth with HIV Through Text Message and Cell Phone Support with and without Incentives: A Sequential Multiple Assignment Randomized Trial (SMART) AIDS Behav. 2025 Mar; 29(3):769-780. . View in PubMed
  • Length of Hospital Stay in Adolescents Receiving High-Dose Oral Contraceptive Pills with and without Conjugated Equine Estrogen for the Treatment of Acute Abnormal Uterine Bleeding J Pediatr Adolesc Gynecol. 2025 Jan 21. . View in PubMed
  • Technology-Based Interventions, with a Stepped Care Approach, for Reducing Sexual Risk Behaviors and Increasing PrEP Initiation Among Transgender and Gender Expansive Youth and Young Adults AIDS Behav. 2024 Dec; 28(12):3956-3969. . View in PubMed
  • Youth perspectives on mobile health adherence interventions: A qualitative study guided by the supportive accountability model Patient Educ Couns. 2024 Feb; 119:108079. . View in PubMed
  • Randomized pilot trial of cell phone support to improve medication adherence among adolescents and young adults with chronic health conditions BMC Digit Health. 2024; 2(1). . View in PubMed
  • Acute HIV Diagnosis After Initiation of Pre-exposure Prophylaxis in a Young Adult Patient: A Case Report J Adolesc Health. 2024 01; 74(1):205-207. . View in PubMed
  • Pediatric subspecialty healthcare providers’ views of recruitment during a randomized controlled trial of a mobile health intervention Contemp Clin Trials Commun. 2023 Jun; 33:101121. . View in PubMed
  • Examining Recruitment Strategies in the Enrollment Cascade of Youth Living With HIV: Descriptive Findings From a Nationwide Web-Based Adherence Protocol JMIR Form Res. 2023 Apr 12; 7:e40077. . View in PubMed
  • Designing an mHealth Roadmap for the Journey to Self-Management: A Qualitative Study with Adolescents and Young Adults Living with Chronic Illness Chronic Illn. 2023 03; 19(1):65-80. . View in PubMed
  • High Prevalence of Anal High-Grade Squamous Intraepithelial Lesions, and Prevention Through Human Papillomavirus Vaccination, in Young Men Who Have Sex With Men Living With Human Immunodeficiency Virus Clin Infect Dis. 2021 10 20; 73(8):1388-1396. . View in PubMed
  • A Uniquely Targeted, Mobile App-Based HIV Prevention Intervention for Young Transgender Women: Adaptation and Usability Study J Med Internet Res. 2021 03 31; 23(3):e21839. . View in PubMed
  • The Healthy Young Men’s Cohort: Health, Stress, and Risk Profile of Black and Latino Young Men Who Have Sex with Men (YMSM) J Urban Health. 2020 10; 97(5):653-667. . View in PubMed
  • Comparing Different Measures of Retention in Care Among a Cohort of Adolescents and Young Adults Living with Behaviorally-Acquired HIV AIDS Behav. 2020 Jan; 24(1):304-310. . View in PubMed
  • Pre-vaccination prevalence of anogenital and oral human papillomavirus in young HIV-infected men who have sex with men Papillomavirus Res. 2019 06; 7:52-61. . View in PubMed
  • A Focus on the HIV Care Continuum Through the Healthy Young Men’s Cohort Study: Protocol for a Mixed-Methods Study JMIR Res Protoc. 2019 Jan 24; 8(1):e10738. . View in PubMed
  • Adaptive Antiretroviral Therapy Adherence Interventions for Youth Living With HIV Through Text Message and Cell Phone Support With and Without Incentives: Protocol for a Sequential Multiple Assignment Randomized Trial (SMART) JMIR Res Protoc. 2018 Dec 20; 7(12):e11183. . View in PubMed
  • Preferences for Injectable PrEP Among Young US. Cisgender Men and Transgender Women and Men Who Have Sex with Men. Arch Sex Behav. 2018 10; 47(7):2101-2107. . View in PubMed
  • The Impact of Cell Phone Support on Psychosocial Outcomes for Youth Living with HIV Nonadherent to Antiretroviral Therapy AIDS Behav. 2018 Oct; 22(10):3357-3362. . View in PubMed
  • Cell phone support to improve medication adherence among solid organ transplant recipients Pediatr Transplant. 2018 Jun 19; e13235. . View in PubMed
  • HIV-Infected Young Men Demonstrate Appropriate Risk Perceptions and Beliefs about Safer Sexual Behaviors after Human Papillomavirus Vaccination AIDS Behav. 2018 Jun; 22(6):1826-1834. . View in PubMed
  • Chest Reconstruction and Chest Dysphoria in Transmasculine Minors and Young Adults: Comparisons of Nonsurgical and Postsurgical Cohorts JAMA Pediatr. 2018 05 01; 172(5):431-436. . View in PubMed
  • Physiologic Response to Gender-Affirming Hormones Among Transgender Youth J Adolesc Health. 2018 04; 62(4):397-401. . View in PubMed
  • Behavioral and Health Outcomes for HIV+ Young Transgender Women (YTW) Linked To and Engaged in Medical Care LGBT Health. 2016 Apr; 3(2):162-7. . View in PubMed
  • Supranormal thymic output up to 2 decades after HIV-1 infection AIDS. 2016 Mar 13; 30(5):701-11. . View in PubMed
  • Baseline Physiologic and Psychosocial Characteristics of Transgender Youth Seeking Care for Gender Dysphoria J Adolesc Health. 2015 Oct; 57(4):374-80. . View in PubMed
  • Acceptability and Feasibility of a Cell Phone Support Intervention for Youth Living with HIV with Nonadherence to Antiretroviral Therapy AIDS Patient Care STDS. 2015 Jun; 29(6):338-45. . View in PubMed
  • Young men and the morning after: a missed opportunity for emergency contraception provision? J Fam Plann Reprod Health Care. 2015 Jan; 41(1):33-7.. View in PubMed
  • Subcutaneous Testosterone: An Effective Delivery Mechanism for Masculinizing Young Transgender Men LGBT Health. 2014 Sep; 1(3):165-7. . View in PubMed
  • The use of cell phone support for non-adherent HIV-infected youth and young adults: an initial randomized and controlled intervention trial AIDS Behav. 2014 Apr; 18(4):686-96. . View in PubMed
  • The initial feasibility of a computer-based motivational intervention for adherence for youth newly recommended to start antiretroviral treatment AIDS Care. 2014 Jan; 26(1):130-5. . View in PubMed
  • Parental support and mental health among transgender adolescents J Adolesc Health. 2013 Dec; 53(6):791-3. . View in PubMed
  • Motivational Enhancement System for Adherence (MESA): pilot randomized trial of a brief computer-delivered prevention intervention for youth initiating antiretroviral treatment J Pediatr Psychol. 2013 Jul; 38(6):638-48. . View in PubMed
  • Barriers to medication adherence in behaviorally and perinatally infected youth living with HIV AIDS Behav. 2013 Jan; 17(1):86-93. . View in PubMed
  • Syndemic theory and HIV-related risk among young transgender women: the role of multiple, co-occurring health problems and social marginalization Am J Public Health. 2012 Sep; 102(9):1751-7. . View in PubMed
  • Parental support and condom use among transgender female youth J Assoc Nurses AIDS Care. 2012 Jul-Aug; 23(4):306-17. . View in PubMed
  • Functional analysis of HIV type 1 Nef gene variants from adolescent and adult survivors of perinatal infection AIDS Res Hum Retroviruses. 2012 May; 28(5):486-92. . View in PubMed
  • Psychological factors, beliefs about medication, and adherence of youth with human immunodeficiency virus in a multisite directly observed therapy pilot study J Adolesc Health. 2011 Jun; 48(6):637-40. . View in PubMed
  • Management of the transgender adolescent Arch Pediatr Adolesc Med. 2011 Feb; 165(2):171-6. . View in PubMed
  • Directly observed therapy (DOT) for nonadherent HIV-infected youth: lessons learned, challenges ahead AIDS Res Hum Retroviruses. 2010 Sep; 26(9):947-53. . View in PubMed
  • Sexual risk taking among transgender male-to-female youths with different partner types Am J Public Health. 2010 Aug; 100(8):1500-5. . View in PubMed
  • Short communication: enhanced CD8+ T cell apoptosis in HIV-infected adolescents with virologic failure on protease inhibitor-based therapy AIDS Res Hum Retroviruses. 2010 Jun; 26(6):681-4. . View in PubMed
  • Identification of HIV-infected 12- to 24-year-old men and women in 15 US cities through venue-based testing Arch Pediatr Adolesc Med. 2010 Mar; 164(3):273-6. . View in PubMed
  • Youth living with HIV and problem substance use: elevated distress is associated with nonadherence and sexual risk J Int Assoc Physicians AIDS Care (Chic). 2010 Mar-Apr; 9(2):113-5. . View in PubMed
  • Improving health outcomes for youth living with the human immunodeficiency virus: a multisite randomized trial of a motivational intervention targeting multiple risk behaviors Arch Pediatr Adolesc Med. 2009 Dec; 163(12):1092-8. . View in PubMed
  • Identification of ongoing human immunodeficiency virus type 1 (HIV-1) replication in residual viremia during recombinant HIV-1 poxvirus immunizations in patients with clinically undetectable viral loads on durable suppressive highly active antiretroviral therapy J Virol. 2009 Oct; 83(19):9731-42. . View in PubMed
  • Transgender female youth and sex work: HIV risk and a comparison of life factors related to engagement in sex work AIDS Behav. 2009 Oct; 13(5):902-13. . View in PubMed
  • Development of a directly observed therapy adherence intervention for adolescents with human immunodeficiency virus-1: application of focus group methodology to inform design, feasibility, and acceptability J Adolesc Health. 2009 Feb; 44(2):124-132. . View in PubMed
  • Long-term observation of adolescents initiating HAART therapy: three-year follow-up AIDS Res Hum Retroviruses. 2007 Oct; 23(10):1208-14. . View in PubMed
  • Improving comprehension for HIV vaccine trial information among adolescents at risk of HIV AIDS Care. 2007 Jan; 19(1):42-51. . View in PubMed
  • An evaluation of service utilization among male to female transgender youth: qualitative study of a clinic-based sample J LGBT Health Res. 2007; 3(2):49-61. . View in PubMed
  • The use of cell phone reminder calls for assisting HIV-infected adolescents and young adults to adhere to highly active antiretroviral therapy: a pilot study AIDS Patient Care STDS. 2006 Jun; 20(6):438-44. . View in PubMed
  • Thymic volume, T-cell populations, and parameters of thymopoiesis in adolescent and adult survivors of HIV infection acquired in infancy AIDS. 2006 Mar 21; 20(5):667-74. . View in PubMed
  • Advance supply of emergency contraception: a randomized trial in adolescent mothers J Pediatr Adolesc Gynecol. 2005 Oct; 18(5):347-54. . View in PubMed
  • Longitudinal antiretroviral adherence among adolescents infected with human immunodeficiency virus Arch Pediatr Adolesc Med. 2005 Aug; 159(8):764-70. . View in PubMed
  • Radioiodine treatment for hyperthyroidism presenting primarily as psychiatric disease in three adolescent and young adult patients J Pediatr Endocrinol Metab. 2004 Aug; 17(8):1121-3. . View in PubMed
  • Virologic and immunologic outcomes after 24 weeks in HIV type 1-infected adolescents receiving highly active antiretroviral therapy J Infect Dis. 2004 Jul 15; 190(2):271-9. . View in PubMed
  • Assessment of thymic activity in human immunodeficiency virus-negative and -positive adolescents by real-time PCR quantitation of T-cell receptor rearrangement excision circles Clin Diagn Lab Immunol. 2003 Mar; 10(2):323-8. . View in PubMed
  • The relationship of unsafe sexual behavior and the characteristics of sexual partners of HIV infected and HIV uninfected adolescent females J Adolesc Health. 2001 Sep; 29(3 Suppl):64-71. . View in PubMed
  • Contraceptive choices in HIV infected and HIV at-risk adolescent females J Adolesc Health. 2001 Sep; 29(3 Suppl):93-100. . View in PubMed
  • Disclosure of serostatus by HIV infected youth: the experience of the REACH studyReaching for Excellence in Adolescent Care and Health. J Adolesc Health. 2001 Sep; 29(3 Suppl):72-9. . View in PubMed
  • Serologic response to hepatitis B vaccine in HIV infected and high-risk HIV uninfected adolescents in the REACH cohortReaching for Excellence in Adolescent Care and Health. J Adolesc Health. 2001 Sep; 29(3 Suppl):123-9. . View in PubMed
  • Antiretroviral medication adherence among the REACH HIV-infected adolescent cohort in the USA AIDS Care. 2001 Feb; 13(1):27-40. . View in PubMed
  • “Reducing the Odds” at what cost: will routine testing of pregnant adolescents decrease perinatal transmission of HIV? J Adolesc Health. 2000 Nov; 27(5):296-7.. View in PubMed
  • Antiretroviral adherence issues among HIV-positive adolescents and young adults J Adolesc Health. 1999 Nov; 25(5):316-9. . View in PubMed
  • HIV prevention for teenage girls: relationships are the medium and the message AIDS Read. 1999 Mar-Apr; 9(2):113-8121. . View in PubMed
  • Heterophil-negative mononucleosis-like illnesses with atypical lymphocytosis in patients undergoing seroconversions to the human immunodeficiency virus Am J Clin Pathol. 1988 Aug; 90(2):169-74. . View in PubMed

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