Was there a large measles outbreak in the past?

Yes, there have been several large measles outbreaks in the past, notably in the late 1980s and early 1990s in the United States, which resulted in thousands of cases and numerous deaths. More recently, outbreaks have occurred in various countries due to declining vaccination rates, with significant incidents reported in 2019 in the U.S. and Europe. These outbreaks highlight the importance of maintaining high vaccination coverage to prevent the spread of measles.