What do you mean?
According to WHO, measles caused 2.6 million deaths a year before 1980, but only 134 200 in 2015. Polio dropped from 350 000 cases in 1988 to 74 in 2015.
According to WHO, measles caused 2.6 million deaths a year before 1980, but only 134 200 in 2015. Polio dropped from 350 000 cases in 1988 to 74 in 2015.