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Unimmunized adults, teens a key factor in spread of whooping cough, officials say

Sep 23, 2010 3:00:00 AM - latimes.com
Pertussis has killed nine infants in California this year. Officials stress the need for older children and adults, especially those who have contact with babies, to get inoculated.

Who is to blame for the spread in California of whooping cough, which has killed nine infants this year?