Ontario measles outbreak continues unabated, prompting New York state to issue travel advisory

The highly contagious measles virus continues to race through Ontario, with 155 new cases recorded over the past week, adding to an outbreak that has prompted New York state to issue a travel advisory urging residents to get vaccinated before crossing the northern border.In its weekly update released Thursday, Public Health Ontario said there have been 816 measles cases diagnosed in the province since last October. Roughly one-fifth of the caseload has been reported over the past week, with 138 infections confirmed and 17 considered probable. Cases have been mostly concentrated in Southern Ontario and appeared in two additional public health units this week.