India, Feb. 1 -- Measles is still one of the most contagious, potentially fatal diseases, but measles is preventable with vaccination programs. What you need to know. Measles has been in decline around the world since the 1980s. The World Health Organization (WHO) says that is largely due to vaccination programs, which - in the past 20 years alone - saved more than 50 million lives. In the 1980s, there were as many as 4 million cases of measles per year. By the early 2020s, infection rates were down to a few hundred thousand.

But measles is not gone yet. And the WHO says that that is largely due to people - especially children - not getting vaccinated: "Where children are unvaccinated, outbreaks occur." Measles is highly-contagious and p...