Whooping cough is making an alarming return across the United States, with more than 25,000 cases recorded so far in 2025—well above pre-pandemic levels. Federal data show this is the second straight year of high activity, placing the country on track for some of its worst numbers in a decade. In comparison, 2019 saw about 18,600 cases.
The spike follows a pattern seen last year, when infections also climbed sharply. At this point in 2024, roughly 33,000 cases had already been reported. Aside from that surge, the last time the nation saw comparable levels was in 2014, with nearly 33,000 infections.
Health officials warn that whooping cough—a highly contagious respiratory illness caused by Bordetella pertussis—poses the greatest threat to babies and young children. Several deaths have occurred this year, including in Louisiana and Washington state, underscoring how swiftly the illness can turn severe.
Unfortunately, whooping cough is making a startling comeback. This isn't just an echo of the past—it's causing outbreaks and even deaths in countries around the world, including the US and across Europe. But before you hit the panic button, take a deep breath: this guide will help you understand the resurgence and what you can do to stay protected.