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Contact information

Email
karen.tiley@paediatrics.ox.ac.uk

Research groups

Oxford Vaccine Group

Karen Tiley

MSc PhD

Senior Epidemiologist

Karen joined the Oxford Vaccine Group in September 2020 to work on a maternal-infant measles seroprevalence study.

She was previously based within the Immunisation Department at Public Health England where she completed a PhD by publication in diphtheria epidemiology in 2015.

Research interests include seroepidemiology, vaccine coverage for childhood and maternal vaccination programmes, and studies relating to pneumococcal carriage and disease.

Recent publications

Maternal iron status and total immunoglobulin-G influence transplacental antibody transfer across eight diverse geographical settings.

Tiley KS. et al, (2026), Vaccine, 73

The waning of maternal measles antibodies: A multi-country maternal-infant seroprevalence study.

Tiley KS. et al, (2025), J Infect, 91

What is the current evidence base for measles vaccination earlier than 9 months of age?: Report from an informal technical consultation of the World Health Organization.

Varma A. et al, (2025), Vaccine, 57

Pneumococcal Carriage and Disease in Adults in England, 2011-2019: The Importance of Adults as a Reservoir for Pneumococcus in Communities.

El Safadi D. et al, (2025), J Infect Dis, 231, e17 - e27

Serum HCoV-spike specific antibodies do not protect against subsequent SARS-CoV-2 infection in children and adolescents.

Ratcliffe H. et al, (2023), iScience, 26

Community seroprevalence of SARS-CoV-2 in children and adolescents in England, 2019-2021.

Ratcliffe H. et al, (2023), Arch Dis Child, 108, 123 - 130

Equity of the Meningitis B vaccination programme in England, 2016-2018.

Tiley KS. et al, (2022), Vaccine, 40, 6125 - 6132

Nasopharyngeal Carriage of Pneumococcus in Children in England up to 10 Years After 13-Valent Pneumococcal Conjugate Vaccine Introduction: Persistence of Serotypes 3 and 19A and Emergence of 7C.

Tiley KS. et al, (2022), The Journal of infectious diseases, 227, 610 - 621

School-based vaccination programmes: An evaluation of school immunisation delivery models in England in 2015/16.

Tiley K. et al, (2020), Vaccine, 38, 3149 - 3156

What school-level and area-level factors influenced HPV and MenACWY vaccine coverage in England in 2016/2017? An ecological study.

Tiley K. et al, (2019), BMJ Open, 9