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Taylor A. Holroyd, PhD

  • Assistant Scientist

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PhD, Johns Hopkins School of Public Health, 2020
MSPH, Johns Hopkins School of Public Health, 2017
BS, McGill University, 2015


Taylor A. Holroyd, PhD MSPH currently serves as a full-time faculty member at the International Vaccine Access Center, located in the Department of International Health. She is an infectious disease epidemiologist who focuses on vaccine-preventable disease and vaccine access, coverage, and uptake. Her work focuses on vaccine confidence, developing and implementing strategies for vaccine acceptance, and scaling up vaccine access. She works primarily on evaluating and improving vaccine acceptance and uptake in low- and middle-income countries to support targeted immunization strategies. Her current research focuses on improving and sustaining access to vaccination in India, supporting the implementation of HPV vaccines in Tanzania, and targeted assessment of Gavi-funded studies pertaining to pneumococcal and rotavirus vaccines in low-resource settings. In addition to vaccine policy and programming, Dr. Holroyd is also interested in maternal immunization and reproductive health.

Dr. Holroyd is also the Program Manager of the BMGF, DIH, and JHVI-sponsored student internship program, the Program in Applied Vaccine Experiences (PAVE).

Honors and Awards

Gordis Teaching Fellowship (2019–20)

The Carol Eliasberg Martin Scholarship (2018–20)

Maryland Higher Education Commission Delegate Scholarship (2018–20)

Maryland Higher Education Commission Senatorial Scholarship (2018–20)

Croucher Foundation Scholarship for Vaccinology in Public Health & Clinical Practice (2018)

The Clements-Mann Fellowship in Vaccine Sciences (2017-18)

Program in Applied Vaccine Experiences Fellowship (2016)

Wendy Klag Memorial Fellowship (2016)

  • vaccines
  • vaccine policy
  • international health
  • vaccine-preventable disease
  • epidemiology
  • infectious disease
  • human papillomavirus
  • maternal immunization

Selected recent publications

  • Holroyd TA, Howa AC, Proveaux T, Delamater PL, Klein NP, Buttenheim AM, Limaye RJ, Omer SB, Salmon DA. School-level perceptions and enforcement of the elimination of nonmedical exemptions to vaccination in California. Hum Vaccin Immunother. 2021 Jan 25;1-8.
  • Holroyd TA, Howa AC, Delamater PL, Klein NP, Buttenheim AM, Limaye RJ, Proveaux TM, Omer SB, Salmon DA. Parental vaccine attitudes, beliefs, and practices: initial evidence in California after a vaccine policy change. Human Vaccines & Immunotherapeutics. 2020;17(6):1-6.
  • Holroyd TA, Wahl B, Gupta M, Sauer M, Blunt M, Gerste AK, Erchick DJ, Santosham M, Limaye RJ. Characterizing mothers and children at risk of being under-immunized in India: a latent class analysis approach. Int J Infect Dis. 2020;S1201-9712(20)30685-8.
  • Holroyd TA, Sauer MA, Limaye RJ. Vaccine decision-making among parents of children on Medicaid with and without autism spectrum disorder. Vaccine. 2020;S0264-410X(20)31082-3. doi:10.1016/j.vaccine.2020.08.041
  • Holroyd TA, Oloko OK, Salmon DA, Omer SB, Limaye RJ. Communicating recommendations in public health emergencies: The role of public health authorities. Health Security, 2020 Jan/Feb;18(1):21-28.