Wyoming health officials are raising concerns about elevated whooping cough rates in 2026, with 26 confirmed cases already reported this year, approximately two-thirds of which are concentrated in Fremont County. This surge follows Wyoming's record year in 2025 with 148 total cases—the highest count in over 70 years—indicating a persistent public health challenge in the state. Health officials caution that actual case numbers are likely higher because many people may not recognize symptoms or report their illness, complicating efforts to track and contain transmission.