Dr Liza Hadley

I am a postdoctoral researcher jointly affiliated to CU Boulder and the University of Cambridge. My research explores the role of infectious disease modelling in international outbreak response. I am interested in how mathematical modelling is used by governments, health organisations, and other policy actors during a health crisis, and whether these processes can be improved. Our recent study interviewed modellers, science advisors, policy makers, and decision makers across 13 different countries to produce an evidence base for the use and translation of modelling in Covid-19 response. I am now developing this area of research further.

Additionally, I provide mathematical modelling support for key vaccine-preventable disease outbreaks in the UK and globally. Recent examples include informing MenACWY vaccination strategy by investigating the expected impact of Covid-19 disruption to meningococcal meningitis in the UK, and supporting the World Health Organization's Meningitis Roadmap by examining optimal outbreak control strategies for pneumococcal meningitis in the African Meningitis Belt.

Current PI: Prof. Stephen Kissler (CU Boulder) and Prof James Wood (Cambridge).

Biography

I initially studied an Undergraduate and Masters in Mathematics at the University of Oxford (2014-2018), and then worked as a Research Assistant at the London School of Hygiene and Tropical Medicine (2019). At LSHTM, I worked in vaccine epidemiology with Mark Jit, Kaja Abbas, and Kiesha Prem, evaluating the impact and cost of one-dose vs two-dose HPV vaccination campaigns. I then moved to Cambridge to pursue a PhD in outbreak modelling and policy (2019-2024), primarily supervised by Dr Olivier Restif and Prof Caroline Trotter. I am now a postdoctoral researcher at CU Boulder/ University of Cambridge (2024-2026).

Publications

Key publications:

•   Published: Hadley, L., Challenor, P., Dent, C., Isham, V., Mollison, D., Robertson, D. A., Swallow, B., Webb, C. R. (2021). Challenges on the interaction of models and policy for pandemic control. Epidemics (37).
•   Published: Hadley, L., Karachaliou Prasinou, A., Christensen, H., Ramsay, M., Trotter, C. (2023). Modelling the impact of Covid-19 and routine MenACWY vaccination on Meningococcal carriage and disease in the UK. Epidemiology & Infection (151).
•   Published: Hadley, L., Soeters, H., Cooper, L., Fernandez, K., Trotter, C. (2024). Modelling control strategies for pneumococcal meningitis outbreaks in the African meningitis belt. Vaccine (42).
•   Published: Marion, G., Hadley, L., Isham, V., Mollison, V., Panovska-Griffiths, J., Pellis, L., Scalia Tomba, G., Scarabel, F., Swallow, B., Trapman, P., Villela, D. (2022). Modelling: understanding pandemics and how to control them. Epidemics (39).
•   Published: Prem, K., Choi, Y. H., Bénard, É., Burger, E. A., Hadley, L., Laprise, J., Regan, M. C., Drolet, M., Sy, S., Abbas, K., Portnoy, A., Kim, J. J., Brisson, M., Jit, M. (2023). Global impact and cost-effectiveness of one-dose versus two-dose human papillomavirus vaccination schedules: a comparative modelling analysis. BMC Medicine (21).
•   Published: Adams, L., Karachaliou Prasinou, A., Hadley, L., Ramsay, M., Campbell, H., Trotter, C. (2024). Estimating the potential number of cases prevented by infant/ toddler immunisation with a MenACWY vaccine. Vaccine (42).
•   Under review: Hadley, L., Rich, C., Tasker, A., Restif, O., Funk, S. (2024). How does policy modelling work in practice? A global analysis on the use of epidemiological modelling in health crises. medRxiv.
•   Under review: Hadley, L., Rich, C., Tasker, A., Restif, O., Funk, S. (2024). Visual preferences for communicating modelling: a study of Covid-19 policy and decision makers. medRxiv.
•   Under review: Oliwa, J. N., Guleid, F., Owek, C. J., Maluni, J., Jepkosgei, J., Sim, S. Y., Were, V., Nzinga, J., Walekhwa, A. W., Clapham, H. E., Dabak, S. V., Kc, S., Unduragga, E. A., Hadley, L., Hutubessy, R., Hagedorn, B. L. (2024). A framework to guide the use of mathematical modelling in evidence-based policy decision-making.

Teaching and Supervisions

Teaching:

I currently have one research assistant and supervise two undergraduate Mathematics courses. I also co-run the St John's Women in Mathematics Summer School and interview for St John's undergraduate admissions. I have previously assisted with teaching for the MPhil in Population Health Sciences.