"Neither vaccination nor natural infection with pertussis guarantees lifelong protective immunity against pertussis. Since immunity decreases after five to ten years from the last pertussis vaccine dose, older children, adolescents and adults are at risk of becoming infected with pertussis and need vaccination."
Thanks, guys. Looks like I need to drag my ass down for the shot. The bout of WC is one of the VERY few strong memories if my very early childhood (I suspect I was around 3-4 years old at the time). I need to re-up my tetanus anyway.