Health Experts in Pueblo are urging people with coughs lasting longer than two weeks to see their physicians.
That's because someone's contracted Whooping Cough in the area.
Whooping Cough is a highly contagious bacterial infection that causes gagging with little or no fever.
Symptoms usually appear between six and 21 days after exposure.
It usually starts out like a cold, followed by episodes of severe coughing that can last for several months. It's most dangerous in infants less than one-year old.