California is experiencing an increase in the number of reported illnesses due to Pertussis. Contra Costa has not reported any deaths from whooping cough in 2010. Children younger than 6 months of age are the most vulnerable to serious illness if they develop Pertussis. The most effective prevention against Pertussis is vaccination. We encourage vaccinations for parents, caregivers, siblings and healthcare workers. This helps decrease the chances of a young infant being exposed to Pertussis. Symptoms of Pertussis begin with a cough and runny nose for 1–2 weeks followed by weeks of coughing fits. Fever is not usually seen. People with symptoms should see their health care provider for testing and diagnosis.