A string of measles deaths in the United States this week – two in states that haven’t reported deaths of this kind in more than three decades – is underscoring the divergent responses to the highly contagious virus in the U.S. and Canada and the resulting outcomes.

Both countries have faced widespread and deadly measles cases that have sickened thousands, fuelled by growing pockets of unvaccinated individuals, particularly in Mennonite communities. But Canada has managed to do what the U.S. hasn’t: Put an end to the outbreak.

Down south the situation is growing worse, with three deaths announced this week. On Thursday, health officials in Wisconsin reported an infant death, the first measles-related fatality in the state since 1990. It followed the deaths of a seven-month-old in New York – another first in 30 years – and a Pennsylvania resident.