|Published:||Jan 16, 2014 8:35 AM EST|
|Updated:||Jan 16, 2014 8:35 AM EST|
When a new whooping cough vaccine was introduced in the late 1990s, there were hopes for a lower infection rate.
But there's been a puzzling spike in new cases.
Here to discuss this and more is Dr. Annette St. Pierre-Mackoul.