When should I vaccinate?

Pertussis vaccination is routinely given at 2, 4, and 6 months of age and then at 1 year and 4 years, so that children have 5 doses of vaccine by the time they enter kindergarten. A booster dose of Tdap is recommended for teenagers and adults, since immunity wanes over time. Tdap is also recommended for pregnant women, every pregnancy. In Michigan, parents are allowed to opt out of vaccinating their children.

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1. What is pertussis?
2. Why the increase in pertussis cases?
3. When should I vaccinate?