A Snohomish Health District official says an infant from east Snohomish County has died from whooping cough.

The Snohomish Health District said Thursday a newborn died this week of pertussis, also known as whooping cough.

District health officer Dr. Gary Goldbaum said newborns are too young to be vaccinated. He urged families whose children have been coughing for more than two weeks to call their doctors to see if they should be tested.

The number of confirmed cases of whooping cough is now 52 so far this year in Snohomish County — more than double last year’s total of 25.

State Health Department spokesman Donn Moyer said this is the second whooping-cough death this year in Washington. The first occurred in April and involved a baby in Yakima County.

Authorities recommend pertussis vaccinations at 2, 4 and 6 months of age, at 12-18 months and again after four years.