Gaurav Kwatra, PhD, MPH

Prevalence of group B Streptococcus colonization in pregnant women and serotype specific immunity among mother-newborns dyads in Ghana and Zimbabwe. Adjei, IA; Mupambireyi, Z; White, SA; Matsikire, E; Manu, A; Dhar, N; Iddrisu, L; Mathai, E; Newton, S; Cuevas, L; Mathai, M; Cowan, F; Asante, KP; Kwatra, G. Vaccine. 2026; 82:128626.

Waning of measles immunity by 5 years of age following an accelerated two-dose measles vaccine schedule at 6 and 12 months in South African children: an observational cohort study. Kapelus, DJ; Ranchod, H; Olwagen, CP; Koen, A; Mutsaerts, EAML; Jose, L; Kwatra, G; Madhi, SA. Vaccine. 2026; 81:128580.

Genomic Characterization of Klebsiella pneumoniae Causing Invasive Disease in South African Infants: Observational Studies Between 2018 and 2023. Olwagen, CP; Izu, A; Khan, S; Jones, S; Briner, C; Kwatra, G; Van Der Merwe, L; Dean, NJ; Baillie, VL; Mahtab, S; Donald, RGK; Simon, R; Dangor, Z; Madhi, SA. Open Forum Infectious Diseases. 2026; 13(1):ofag004.

Higher serum zinc micronutrient levels are associated with reduced susceptibility to Group B Streptococcus rectovaginal colonisation in pregnant women. Dhar, N; Gaddy, J; Aronoff, DM; Channa, K; Madhi, SA; Kwatra, G. PLoS ONE. 2026; 21(3):e0344689.

Prevalence and associated factors of methicillin-resistant and vancomycin-susceptible Staphylococcus aureus among clinical isolates at Hawassa university comprehensive specialized hospital, Ethiopia, 2019-2023. Tsige, I; Reda, DY; Kefeni, M; Merid, Y; Negash, AA; Kwatra, G; Balcha, ES; Ali, MM. BMC Infectious Diseases. 2025; 25(1):1388.

Prevalence of hepatitis B virus infection among pregnant women and cord blood hepatitis B surface antigen positive newborns in sub-Saharan Africa and South Asia. Bokop, C; Dhar, N; Izu, A; Thaver-Kleitman, J; Prabdial-Sing, N; Ali, MM; Akaba, G; Barsosio, HC; Berkley, JA; Beck, MM; Tapia, MD; Veeraraghavan, B; Kwatra, G; Madhi, SA. Journal of Clinical Virology. 2025; 179:105826.

Hybrid Immunity in a Mozambican Cohort After 1 or 2 Doses of the BBIBP-CorV Vaccine. Chissumba, RM; Kwatra, G; Ramgi, P; Enosse, M; Sigaúque, A; Khosa, C; Viegas, E; Bule, O; Langa, J; Dhar, N; Richardson, S; Moore, P; Madhi, S; Jani, IV. Clinical Infectious Diseases. 2025; 80(Supplement_1):S57-S65.

T-cell responses induced by SARS-CoV-2 index-virus nanoparticle protein vaccine to the ancestral and omicron variants 6 months following primary vaccination. Mcmahon, WC; Kwatra, G; Nunes, MC; Izu, A; Koen, AL; Greffrath, J; Shalekoff, S; Tiemessen, CT; Shinde, V; Bennett, C; Madhi, SA. Communications Medicine. 2025; 5(1):220.

Sero-epidemiology of measles immunoglobulin G antibodies among newborns from South-East Asia and sub-Saharan Africa: an observational, multicenter study. Bokop, C; Dhar, N; Izu, A; Ali, MM; Akaba, G; Barsosio, HC; Berkley, JA; Beck, MM; Chaka, TE; Cutland, CL; Tapia, MD; Veeraraghavan, B; Madhi, SA; Kwatra, G. International Journal of Infectious Diseases. 2025; 154:107882.

Association of serum anti-gbs2106 protein immunoglobulin G (IgG) in newborns and risk reduction of invasive group B streptococcus disease during early infancy. Gent, V; Dhar, N; Izu, A; Jones, S; Dangor, Z; Briner, C; Hosken, N; Kwatra, G; Madhi, SA. Vaccine. 2025; 54:127016.