The Hawaiʻi Department of Health (DOH) is responding to a rise in statewide pertussis (whooping cough) cases.

As of July 31, 2025, DOH has identified 203 cases of pertussis – more than double the 84 cases identified in all of 2024.

Cases have been reported in every county, with the highest rates on Kaua‘i, Maui, and Hawai‘i Island. Infants under 1 year old have been the most severely affected group. In addition, there are elevated case rates being seen among toddlers, children and adolescents.

Pertussis is a highly contagious respiratory disease spread through the air via coughs or sneezes of an infected person. Initially, the symptoms resemble a cold but can progress to intense coughing fits. In children, coughing fits can be followed by a deep breath that makes a “whooping” sound. Health complications can be serious and even life-threatening.

The most effective way to reduce the risk and severity of pertussis is through vaccination with either the DTaP (diphtheria, tetanus and pertussis) or Tdap (tetanus, diphtheria and pertussis) vaccines. DTaP has been in use for more than 30 years, and the first dose is recommended at 2 months of age.

To protect infants who cannot yet complete the full vaccine series, DOH encourages a  “cocooning strategy” which involves ensuring close contacts of a baby, including parents, siblings, grandparents, childcare staff, caregivers and healthcare providers, are up to date on their pertussis vaccines.

For more information about pertussis, visit the Department of Health website.