SAN JOSE, Calif. (AP) - Whooping cough cases in California are up again and state health officials say they expect them to keep rising.
The California Department of Public Health said there were 2,649 pertussis cases from Jan. 1 to May 27 - that's more cases being reported in the first five months of the year than all of 2013.
More than 800 cases were reported in April alone, the highest monthly count since four years ago, when a total of 9,159 cases were reported. Officials say the disease peaks every three to five years.
The San Jose Mercury News reports there are several reasons behind the trend. Health officials point to the public not sufficiently seeking out immunizations, waning immunity and more aggressive detection of the persistent and sometimes deadly cough.