According to the vaccine's maker, Valneva, the FDA based its decision to suspend the shot on four new serious adverse events that happened outside the U.S., three of which were in people ages 70 to 82 years and the other in a 55-year-old individual.

By Stephanie Brown HealthDay ReporterMONDAY, Aug. 25, 2025 (HealthDay News) -- The U.S. Food and Drug Administration is suspending the biologics license for the live-attenuated chikungunya vaccine, Ixchiq, in the United States. The move comes after reports of serious side effects in older adults similar to the symptoms of chikungunya virus.

The US Food and Drug Administration (FDA) announced late last week that it has suspended the license for French drugmaker Valneva's chikungunya vaccine, saying that continued administration of the vaccine to the public would pose a danger to health.