New Mexico - Health officials warn whooping cough is on the rise in New Mexico.
More than 670 cases have been confirmed by the state's health department.
Two of the cases, both in infants, were fatal.
New Mexico ranks 10th in the nation with about 27 cases for every 100,000 people. That's three times the national average.
Health officials say the answer is immunization.
Whooping cough is a highly contagious bacterial illness that attacks the respiratory system.