Sen. Bill Cassidy (R-LA) is calling on Health and Human Services Secretary Robert F. Kennedy Jr. to support efforts to vaccinate infants against whooping cough amid a nationwide outbreak of the disease fueled by low vaccination rates.

Cassidy wrote to Kennedy in a letter on Friday that he also posted to X that he believes the secretary’s endorsement of the vaccine for whooping cough, also known as pertussis, would bolster vaccination rates among the most vulnerable communities. 

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