M. S. Cunha, J. M. Guerra, M. Siconelli, B. A. Fonseca, Jessica Caroline de Almeida Dias, Gisele Dias de Freitas, E. Sabino, E. Manuli, Geovana Maria Pereira, I. N. Valença, Patrícia Sayuri Silvestre Matsumoto, N. Faria, N. Fernandes
2026.2.16REVISTA DO INSTITUTO DE MEDICINA TROPICAL DE SAO PAULO
tlooto Summary
The detection of yellow fever virus in Campinas and Ribeirao Preto city areas from September 2024 to February 2025 shows a re-introduction in 2022 from Midwest Brazil followed by persistence in Sao Paulo State.
Abstract
We report the detection of yellow fever virus in Campinas and Ribeirao Preto city areas (two geographic areas within Sao Paulo State, Brazil) from September 2024 to February 2025. Phylogenetic analysis of six new genomes showed a re-introduction in 2022 from Midwest Brazil followed by persistence in Sao Paulo State. Continued surveillance in neotropical primates is required to prevent cases in humans.
Citation format
CUNHA, M. S., et al. Yellow fever virus resurgence in sao paulo state, Brazil, 2024–2025. REVISTA DO INSTITUTO DE MEDICINA TROPICAL DE SAO PAULO, 2026, 68: e13.