Brazil Halts Butantan-DV Dengue Shots After 2 Deaths and 42 Warning-Sign Cases

2 articles · Updated · outbreaknewstoday.substack.com · Jun 9

500,000 administered doses yielded 42 post-vaccination cases with warning signs, including three severe cases and two deaths, prompting Brazil's Health Ministry to temporarily stop the current Butantan-DV campaign.
The ministry, Anvisa and Butantan said the pause is precautionary while they investigate whether the events were caused by the vaccine; the reported cases equal 0.008% of doses given and no causal link has been confirmed.
The strategy had targeted primary-care workers and people aged 15-49 in Botucatu, Maranguape, Nova Lima and the Araguaina region after starting in January.
Vaccinated people are still considered protected, but officials told them to monitor for 21 days for fever, severe abdominal pain, vomiting, bleeding, dizziness or dehydration as surveillance and case reporting are intensified.

Sources

outbreaknewstoday.substack.com6d ago

Brazil Ministry of Health Discontinues Butantan-DV Dengue Vaccine After Deaths, Warning Signs

Valor International8d ago

Brazil Suspends Butantan Dengue Vaccine, Recalls Batches After Death Investigation

With dengue cases plummeting 94%, why did Brazil halt its new vaccine after two deaths out of 500,000 doses?

Did a fatal flaw in Brazil's dengue vaccine slip past years of clinical trials, or is this the inevitable cost of medical progress?

Butantan-DV Dengue Vaccine Suspended in Brazil After 2 Deaths: Public Health Response and Scientific Lessons

Overview

Brazil launched its dengue vaccination campaign in January 2026, using the Butantan Institute vaccine. After over 500,000 doses were given, two deaths were reported and identified through routine safety monitoring. This led to an immediate suspension of the campaign on June 8, 2026, as a precaution due to rising safety concerns. The suspension not only affected Brazil but also raised questions about similar vaccines planned for release elsewhere. Authorities are now investigating the cases to determine if the vaccine was responsible, while emphasizing that such events are rare and that ongoing monitoring is essential for public safety.

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