Brazil suspends Butantan dengue vaccine after 42 adverse cases, 2 deaths

Two deaths and three hospitalizations reported among vaccinated individuals, with cases involving neurological complications and dengue-like severe illness.

In the long human effort to outpace infectious disease, even the most promising tools sometimes demand pause. Brazil's Health Ministry suspended distribution of the Butantan dengue vaccine on June 8, 2026, after 42 severe adverse reactions — including two deaths — emerged among more than 500,000 people vaccinated since January. The cases are unexpected precisely because such symptoms were absent during clinical trials, leaving investigators to untangle whether the vaccine is responsible or whether coincidence has cast a shadow over a domestic scientific achievement. The answer, still unwritten

Brazil suspends Butantan dengue vaccine after 42 adverse cases, 2 deaths

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