Pertussis vaccine's effectiveness wanes after final dose, study finds
Los Angeles Times
If you live in California, chances are you remember the pertussis outbreak of 2010. That year, Los Angeles alone saw nearly 1000 cases of the illness, also known as whooping cough, and the state as a whole saw around 9000.
More whooping cough cases worry health unit CBC.ca
Whooping cough vaccines don't last as long as doctors had thought 89.3 KPCC
In Depth:Whooping Cough Vaccine Wanes Over Time
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