Measles is spreading in Ontario. Do you need a booster?

A major outbreak of measles has infected more than 800 people in Ontario. It’s the first outbreak of its size since the disease was declared eliminated in 1998. Now, lower vaccination rates are leading to a serious outbreak in the province, enough to garner a travel advisory to the province from New York State south of the border. Here’s what you need to know about measles — how it’s transmitted, how you can protect yourself, and whether you need to update your vaccinati