Measles outbreaks make 2018 a near-record year for U.S.
In 2018, 349 individual cases of measles were confirmed in 26 states and the District of Columbia.
People who are fully vaccinated against measles have very little risk of becoming infected.
The vaccine provides upwards of 95 percent protection.
But measles is one of the most infectious viruses known and will infect 90 percent of people who breathe it in.
Although some people argue that measles is a relatively harmless childhood illness, it can kill.
Measles causes encephalitis and pneumonia and before mass vaccination began in the 1980s, measles killed nearly 2.6 million people a year, according to the World Health Organization.
It still kills more than 100,000 people a year, mostly children under five. One in 1,000 people who catch measles die of it.
Takeaway: Vaccinate people.