Whooping cough: How bad is it this year?

Produced by Evie Liu & Chris Keller | Updated July 28, 2014

Since June this year, cases of pertussis—or whooping cough—in California have reached epidemic proportions in California, according to the state Department of Public Health.

An epidemic is the occurrence of more cases of disease than expected in a given area or among a specific group of people over a particular period of time, according to The Centers for Disease Control and Prevention.

"In recent non-peak years, an average of 80 to 110 cases of pertussis occur each month in California so this is considered the baseline level of disease activity, " Corey Egel from the state Department of Public Health said in an email. "In both April and May 2014, more than 900 cases have occurred in each month which is nearly 1000% or ten times over baseline."

Use the map below to see how many whooping cough cases have been reported in your county so far in 2014, and to compare with the number of cases reported from 2010 to 2013.