Colorado is experiencing its worst season for whooping cough in more than six decades. Statewide 1,407 cases have been reported as of Dec. 8 - a number not seen since 1948.
State health officials are concerned about a growing pertussis epidemic in Colorado. To date, 1,026 cases of pertussis (commonly referred to as whooping cough) have been confirmed statewide.
Originally published on Thu September 13, 2012 9:24 am
To protect children against whooping cough, doctors recommend five shots of vaccine before they turn 7.
But what happens after that? How long does the protection last?