Multiple counties in upstate New York have reported measles cases in the past week.
A total of four unvaccinated residents in Tioga, Steuben and Otsego counties have been infected by the virus. Cases have also cropped up in Seneca, Madison and Allegheny Counties.
Measles is one of the most contagious viral illnesses, but also one of the most preventable, according to Eli Finkelstein, an infectious disease specialist at Cayuga Health…