A woman in her 60s was exposed to the mosquito-borne illness in Middlesex County, and a woman in her 70s was probably exposed while out-of-state, officials said.

Two women who’ve contracted West Nile virus have brought the total number of cases in Massachusetts to 15 this year, officials announced Friday afternoon. One woman is in her 60s, the Massachusetts Department of Public Health said. She was most likely exposed in Middlesex County.

Health and environmental officials in Rhode Island and Massachusetts are reminding people to keep protecting themselves from mosquito bites, as the risk of transmitted diseases remains.