Huron Perth Public Health (HPPH) are reporting the first case of measles in the counties.
HPPH said someone tested positive after laboratory confirmation and they have completed case and contact tracing but will not provide any additional public details.
Dr. Lauren Hayward, Physician Consultant at HPPH, said there is an ongoing measles outbreak in southwestern Ontario, and they have been closely monitoring the situation.
Dr. Hayward said now is a good time to review information about measles and measles vaccination.
Measles is a highly contagious virus. It is airborne and can remain in the air and on surfaces for up to two hours. The virus can spread to other people when someone with measles coughs, sneezes, talks, or breathes.
Someone who has measles can be contagious for four days before the rash starts until four days after the rash starts.
Most people fully recover within two to three weeks, but measles can also cause complications, including pneumonia.
If you think you or a family member has been exposed to measles or has the virus, HPPH advises staying home and avoiding contact with others. You should also avoid having visitors in your home.