There are now 11 confirmed cases of measles in Rockland County - with at least another three cases still under investigation.

According to the Rockland County Health Department, the outbreak has affected both children and adults. Five of them were infected in Israel while the other six caught it in Rockland County.

MORE: Measles alert issues in Weschester and Rockland counties

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Symptoms include fever, rash, runny nose and watery eyes that can show up two weeks after exposure. Measles is highly contagious doctors say droplets can live for up to two hours after someone leaves a room and it can stay present either on objects or in the air. If you experience any of these symptoms, officials say call a doctor immediately.

Those who have already been administered what's called the MMR vaccine or have had measles are immune to the virus, as well as those born before 1957. Health officials are now urging the public to see if they're up to date on their vaccinations. "Nine out of ten people who are not protected with the vaccine and are exposed to someone with live measles, active measles - will become infected," says Dr. Nadine Cohen, of CareMount Medical.

Doctors say children typically receive their first MMR vaccine for the measles at 12-15 months of age. The second dose is given around 4 to 6 years old. With this recent outbreak, officials recommend young children get both vaccines.

"Two MMRs can be given within 28 days and that's considered lifelong protection," says Rockland County Commissioner of Health Patricia Schabel Ruppert.

The Rockland County Health Department is offering free vaccines today at the Community Outreach Center in Monsey from 4:30 p.m. to 6:30 p.m. On Friday, free vaccines will also be available in Nanuet from 9:30 a.m. to 11:30 a.m. at the Pascack Community Center.

Health officials say there's no need to panic, but they expect the number of confirmed cases to grow.