Originally Posted by 
JDNSW
				
			 
			I think there were two aspects to this - yes, we were shielded from the reality; my father lost a brother to diphtheria, my mother lost three sisters to TB. Both the primary and secondary schools I went to had children who used leg braces as a result of polio. But I only learned about my parents siblings long after I was an adult - I knew they had died, but not that it was infectious diseases. My parents were terrified of polio and TB in particular, and I found out years later that my sister was not allowed to visit the house of one of her closest school friends because a sibling had TB. We all had all available vaccinations, but most of the current ones did not exist when I was young. (I am also a 1941 model)
The other factor is that the child mortality figures have dropped markedly in the last fifty years, from 24.9 in 1960 to 3.7 in 2018 (deaths per 1000/annum for under fives). This means that a barely noticeable figure, for example from measles, in 1969 can represent a major incrrease in mortality today.
This reduction in child mortality has come in a large part because of the widespread introduction of vaccination for previously widespread diseases, but also because of improvements in treatments, some of which are cheap and easy - the prime example is that of treatment for gastroenteritis by oral rehydration. Until about the 1980s, this could only be treated by intravenous rehydration -  and was the largest single cause of child deaths. 
Even though vaccine preventable diseases such as measles caused a small fraction of child deaths in the sixties, that same number represents a much larger fraction of the current rate if low vaccination rates allow an epidemic to develop.
Most people should be aware of the fact that until the 1920s, even in countries such as Australia, about half of all children died before starting school. The spread of safe drinking water and other public health measures, helped by improvements in infectious disease control started the decline of this figure (starting about 1900 in major Australian cities), and better understanding of diet and nutrition continued this decline, and particularly since WW2 more vaccines and there more general availability plus antibiotics and other improvements in medicine have meant that in the last few decades child death from infectious disease has become rare. If the vaccination rate drops, we lose this - measles is the canary in the coal mine - while only 0.2% of those infected will die, it is just about the most infectious serious disease known.