The Hawaiʻi Department of Health (DOH) has been notified of a second detection of measles virus in wastewater from West Maui County.

The latest positive sample was collected Nov. 30, 2025 and was tested through the National Wastewater Surveillance System (NWSS).

This follows an earlier detection of measles virus in Maui wastewater from samples collected on Nov. 18 in Central and West Maui as previously reported by DOH, as well as two rounds of negative wastewater samples collected in West Maui on Nov. 24 and 25 from the same treatment plant.

Measles has not been detected again at the Central wastewater treatment site, after three rounds of testing in late November.

While no cases of measles have been confirmed on Maui or elsewhere in the state at this time, DOH has advised medical providers to remain on high alert.

Measles symptoms usually start with a high fever, cough, runny nose and red eyes, followed by a rash of tiny red spots that begins at the head and spreads downward. The disease can lead to serious complications, including pneumonia, neurological illness and death.

People with measles are contagious from four days before the rash appears through four days after.

Anyone who thinks they may have symptoms or may have been exposed, should isolate immediately and contact their health care provider for guidance to prevent further spread.