The province's chief medical officer of health is urging Ontarians to make sure they are immunized against the measles amid the most severe outbreak in the province in more than a decade.

Over 96 per cent of cases in Ontario are among individuals who are unimmunized, or have unknown immunization status,' reports Dr. Kieran Moore, and a 'majority of Ontario's cases are concentrated in s

Over 96 per cent of cases in Ontario are among individuals who are unimmunized, or have unknown immunization status, and were exposed in their community or while travelling.”