The number of whooping cough cases in California has officially reached epidemic proportions, the California Department of Public Health reported.
Whooping cough, known to doctors as pertussis, has experienced a resurgence this year with more than 3,400 new cases reported between January 1 and June 10, according a statement released by the department.
The department said whooping cough is cyclical, peaking every three to five years. The last big spike in cases was in 2010.
Los Angeles County has experienced around 350 new cases so far this year with Long Beach being hit especially hard. The city has seen more than 90 new infections, making up nearly 20 cases per 100,000 people.
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