Ann Sarah Walker

Ann Sarah Walker's indexed work centers on the epidemiology and genomic surveillance of bacterial infections, particularly Clostridium difficile transmission in hospital wards, traced through whole-genome sequencing and extensive epidemiological data. Her senior-authored study identifying diverse sources of C. difficile infection remains her most-cited, while first-author analyses linked bacterial strain type and host biomarkers to mortality in C. difficile infection. A parallel line examines long COVID symptom trajectories after vaccination, alongside earlier HIV research on co-trimoxazole prophylaxis in immunosuppressed adults starting antiretroviral therapy in Africa. Beyond these, she contributed as a middle author to consortium work on the global burden of bacterial antimicrobial resistance, and to trials comparing oral versus intravenous antibiotics for bone and joint infection and tracking antibody status and SARS-CoV-2 incidence in health care workers