Update: Health officials on Thursday, April 11 said the Washtenaw County case was in fact a false-positive. More here.

Health officials on Monday, April 8 believed they had confirmed Washtenaw County’s first case of measles amid a wider Michigan outbreak.

Washtenaw County Health Department spokesperson Susan Ringler Cerniglia said that while this case was a false positive, it is still important for people to be vaccinated to protect against measles.

Of 40 previously verified Michigan cases, 39 involved Oakland County residents and one was confirmed in a Wayne County resident. The ages of the infected range from 8 months to 63 years old, the Michigan Department of Health and Human Services said.

A list of exposure sites in Oakland County is available here.

“If exposed, approximately 90 percent of people who have not been vaccinated or previously had measles will develop the disease,” the Washtenaw County Health Department says.

The Washtenaw County Health Department is hosting two upcoming walk-in vaccination events at 555 Towner St. in Ypsilanti.

Tuesday, April 9, 9 a..m. to 7 p.m.

Wednesday, April 10, 5 p.m. to 7 p.m.

The vaccinations are free to those with Medicaid or Blue Cross Blue Shield insurance, as well as anyone who is uninsured or under-insured, the county says.

Anyone with private health insurance should contact their health provider for vaccination information.

“It is important for all Washtenaw County residents to be protected against measles, which is highly contagious, but vaccine-preventable,” the county said. “Two doses of the(measles, mumps and rubella) vaccine is about 97 percent effective at preventing measles. One dose is 93 percent effective.”

There have been no confirmed cases involving students, staff or teachers in Ann Arbor Public Schools, the district said.

Measles is an airborne disease that is spread from person-to-person contact. Symptoms usually appear with in one and three weeks of being contracted.

According to the Washtenaw County Health Department, symptoms include:

High fever

Cough

Runny nose

Red, watery eyes

Tiny white spots on the inner cheeks, gums and roof of the mouth 2-3 days after symptoms begin

A rash that is red, raised, blotchy; usually starts on face, spreads to trunk, arms, and legs 3-5 days after symptoms begin

For further information, call the Washtenaw County Health Department, 734-544-6700.