Add Yahoo as a preferred source to see more of our stories on Google. Whooping cough, or pertussis, is caused by the Bordetella pertussis bacteria. - Meredith Newlove/CDC/AP For the second year in a ...

For the second year in a row, the U.S. has surpassed 25,000 whooping cough cases — another sign of the risks of falling vaccination levels. Often called the "100-day cough," whooping cough or ...

(CNN) — For the second year in a row, the US has surpassed 25,000 whooping cough cases — another sign of the risks of falling vaccination levels. Often called the “100-day cough,” whooping cough or ...