From the Buffalo News:
State health officials have issued an advisory that some people may have been exposed to measles May 11-12 at four locations, including Niagara Falls.
A tourist from India with measles visited the locations, according to the Health Department.
People lacking immunity or who are not sure if they have been vaccinated should contact their physician if they develop measles symptoms, which include fever and rash 10 to 12 days after exposure. Measles is spread by direct contact with nasal or throat secretions.
See also:
Fox 5 NY – Tourist with measles rode Maid of the Mist at Niagara Falls; measles exposure warning