Part of a national rise in cases, Louisiana has reported two infant deaths from pertussis this year.
The country reports steady expansion, including beyond expected areas, in a short amount of time.
In the first 3 months of 2025, 131 human cases were confirmed, with 53 deaths.
Officials have confirmed 131 cases this year in four countries, 53 of them fatal.
Cases, on the rise since late 2024, have spread to new parts of Brazil and Colombia.
California now has 40 avian flu outbreaks in dairy herds, and the US total has reached 238.
Pakistan also reported several WPV detections in environmental samples from five locations.
One of the countries is Cameroon, which has reported cases in Douala, its biggest city.
The vaccine campaign targets 610,000 people in South Sudan's Western Equatoria state.
The latest suspected cases stem from exposures at a daycare provider.
