Measles cases in Canada, mostly in Alberta, surpass 4,500, linked to unvaccinated communities.

Measles cases in Canada have surpassed 4,500, with Alberta reporting more cases than the entire U.S. this year. The outbreak is linked to unvaccinated communities, particularly Mennonites, and has led to hospitalizations and one infant death. In the U.S., exposures have been reported in Pennsylvania and Wisconsin, with health officials warning of potential exposures at various public locations. Measles is highly contagious and spreads through the air, with symptoms including fever, cough, runny nose, and a rash.