If it is true that...

In the early 1900s, there were about 10,000 Americans a year who died from measles and mumps

and

By 1964, there were about 300-400 Americans who died from measles and mumps, and almost all were severely malnourished kids

and

Before the poverty program, there were a lot of starving children in America

Then it must be true that...

The deaths from measles and mumps can largely be attributed to malnutrition

If it is true that...

The deaths from measles and mumps can largely be attributed to malnutrition

Then it must be true that...

It is very hard to kill a healthy child with any infectious disease