The cases of confirmed measles in the Hudson Valley continues to rise dramatically.

On Wednesday, health officials from Rockland County confirmed there are now 40 cases of measles with at least 11 others who likely have the virus.

On Monday, Hudson Valley Post reported 33 confirmed cases, last week it was 11 confirmed cases.

Two weeks ago it was reported an international traveler with measles visited multiple locations in Rockland and Westchester counties. Among the locations infected with measles was the Costco in Nanuet and Westchester Medical Center.

Health officials announced all schools in the Village of New Square, Spring Valley and Monsey keep all unvaccinated or under-vaccinated students home from school until 21 days have passed from the last confirmed measles case, ABC reports. 

10 schools have been impacted with cases of measles, according to health officials. A total of 15 schools in Rockland County are impacted by the new restrictions.

Measles is a highly contagious respiratory disease caused by a virus that is spread by direct contact with nasal or throat secretions of infected people. People first develop a fever, then often a cough, runny nose and watery eyes, followed by an appearance of a rash. People are considered infectious four days before to four days after the appearance of the rash.

Symptoms include a fever, rash, cough, conjunctivitis or a runny nose. Symptoms usually appear 10-12 days after exposure but may appear as early as 7 days and as late as 21 days after exposure.