Open AccessPeriods of high dengue transmission defined by rainfall do not impact efficacy of dengue vaccine in regions of endemic disease
Author(s) -
Chloé Pasin,
M. Elizabeth Halloran,
Peter B. Gilbert,
Edith Langevin,
R. Leon Ochiai,
Punnee Pitisuttithum,
María Rosario Capeding,
Gabriel Carrasquilla,
Carina Frago,
Margarita Cortés,
Laurent Chambonneau,
Zoe Moodie
Publication year - 2018
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0207878
Subject(s) - dengue fever , wet season , dengue vaccine , medicine , incidence (geometry) , transmission (telecommunications) , vaccine efficacy , dengue virus , virology , environmental health , vaccination , biology , ecology , physics , electrical engineering , optics , engineering
Objective To evaluate the association of rainy season with overall dengue disease incidence and with the efficacy of the Sanofi Pasteur recombinant, live, attenuated, tetravalent vaccine (CYD-TDV) in two randomized, controlled multicenter phase III clinical trials in Asia and Latin America. Methods Rainy seasons were defined for each study site using climatological information from the World Meteorological Organization. The dengue attack rate in the placebo group for each study month was calculated as the number of symptomatic, virologically-confirmed dengue events in a given month divided by the number of participants at risk in the same month. Time-dependent Cox proportional hazard models were used to test whether rainy season was associated with dengue disease and whether it modified vaccine efficacy in each of the two trials and in both of the trials combined. Findings Rainy season, country, and age were all significantly associated with dengue disease in both studies. Vaccine efficacy did not change during the rainy season in any of the analyses. Conclusions Although dengue transmission and exposure are expected to increase during the rainy season, our results indicate that CYD-TDV vaccine efficacy remains constant throughout the year in endemic regions.