The numbers are declining this year , with 14,270 cases reported through August , compared with 32,680 cases through August 2012 . Ten pertussis cases have been reported in California . `` We 're clearly having an epidemic , '' a pediatrics professor says . Nearly 2,000 cases are estimated to occur for every one that 's reported . Nationwide , the number of cases is down 2 months of age , the the Center for Vaccine Awareness in Research says .
Ten pertussis cases have been reported in California . `` We 're clearly having an epidemic , '' a pediatrics professor says . Nearly 2,000 cases are estimated to occur for every one that 's reported . Nationwide , the number of cases is down 2 months of age , the the Center for Vaccine Awareness in Research says .