B.C.
Whooping cough is nothing to mess around with. People who get it, no matter what their age, have a hard time surviving it. It's making a comeback. My son got the shot on the regular schedule when he was an infant, and he just got his DTap booster which his school is requiring to enter middle school. Seven infants have died from pertussis so far in 2010 — all younger than 3 months old. That doesn't sound like a lot, but numbers don't matter if the child that dies is yours.
http://shotbyshot.org
http://whyichoose.org