Ali Judd, Professor of Epidemiology

Ali is a Professor of Epidemiology at UCL, and Head of Epidemiology and RWD Science at Penta. Her main interests are in paediatric infections, including HIV, hepatitis and COVID-19. She co-leads a network of cohort studies across Eastern and Western Europe and Thailand, addressing questions about the health of children living with HIV and related infections. This network is the European Pregnancy and Paediatric Infections Cohort Collaboration (EPPICC), which is jointly coordinated across UCL and Penta. She also co-leads the large EC-funded “VERDI” collaboration which investigates the impact of COVID-19 variants of concern on pregnant women and children across Europe and globally. She is a co-investigator in the International AIDS Society Collaborative Initiative for Paediatric HIV Education and Research (CIPHER) Cohort Collaboration, within which questions of global public health importance for children and young people living with HIV are addressed.

For hepatitis C, she is developing studies investigating treatment options for pregnant women with chronic HCV. Her observational studies run parallel to the paediatric and adolescent infection trials run at UCL, providing a complementary approach to addressing questions of trial feasibility as well as longer-term effectiveness and safety.

Ali is a member of the Scientific Committee of the International Workshop on HIV Pediatrics, and she is a trustee of the Children’s HIV Association.

Selected publications

Castro H, Sabin C, Collins IJ, Okhai H, Sandgaard KS, Prime K, Foster C, Le Prevost M, Crichton S, Klein N, Judd A. Evolution of CD4 T-Cell count with age in a cohort of young people growing up with perinatally acquired HIV. Clin Infect Dis 2023: 2023 Oct 11:ciad626. doi: 10.1093/cid/ciad626. PMID: 37820036

The European Pregnancy and Paediatric Infections Cohort Collaboration (EPPICC) study group. Incidence and severity of SARS-CoV-2 infection in children and young people with HIV in Europe.  AIDS 2023, 37: 1633-1639. PMID: 37450630. doi: 10.1097/QAD.0000000000003610

Cohen-Stavi CJ, Magen O, Barda N, Yaron S, Peretz A, Netzer D, Giaquinto C, Judd A, Leibovici L, Hernán MA, Lipsitch M, Reis BY, Balicer RD, Dagan N. BNT162b2 Vaccine Effectiveness against Omicron in Children 5 to 11 Years of Age. N Engl J Med. 2022 Jul 21;387(3):227-236. doi: 10.1056/NEJMoa2205011. Epub 2022 Jun 29. PMID: 35767475; PMCID: PMC9258754.

Ades AE, Gordon F, Scott K, Collins IJ, Thorne C, Pembrey L, Chappell E, Mariné-Barjoan E, Butler K, Indolfi G, Gibb DM, Judd A. Overall vertical transmission of HCV, transmission net of clearance, and timing of transmission. Clin Infect Dis. 2022: ciac270. doi: 10.1093/cid/ciac270. Epub ahead of print. PMID: 35403676.

Chappell E, Thorne C, Collins IJ, Baisley K, Yapa HM, Gareta D, Bärnighausen T, Herbst K, Judd A. It ain’t what you do, it’s the way that you do it: the pitfalls of using routine data to measure early infant HIV diagnosis in HIV-exposed infants.  PLOS One, 2021 Sep 30;16(9):e0257496. doi: 10.1371/journal.pone.0257496

Research Interests

  • Infections in children and pregnant women
  • Observational studies
  • Real-world data
  • Epidemiology
  • Cohort collaborations

Research Areas

  • HIV
  • Other conditions

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