September 11, 2026 · Lancet (London, England) · DOI: 10.1016/S0140-6736(26)01390-5

Immunogenicity of fractional one-fifth and one-half doses of 17DD yellow fever vaccine compared with full dose in children aged 9-23 months in Uganda: a phase 4, single-blind, randomised clinical trial

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This study aimed to evaluate the immunogenicity of fractional doses (one-fifth and one-half) of the 17DD yellow fever vaccine compared to the full dose in children aged 9-23 months in Uganda. The findings demonstrated that both fractional doses were non-inferior to the full dose in terms of seroconversion, suggesting their potential use for vaccination during supply shortages in young children.

Reena H Doshi, Irene Lubega, Pierre Muhoza, Grace Carlock, Arthur Brian Sekiziyivu, Alexandra Tuttle, Marjorie Najjengo, John Kayiwa, Rebecca Casey, Eric C Mossel, Winfred Nakato, Conrad Tumwine, Ellon Twinomuhwezi, Julius Lutwama, Annet Nankya, Leonara Rebecca Nabatanzi, Semakula Charles, Allison M Brown, Jennifer Harris, Leora Feldstein, Susan Chu, Hongjiang Gao, Andrew Kambugu, J Erin Staples, Terri B Hyde

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