When vaccines were popularised in the 1800s poverty and overcrowding in cities was common and so infectious diseases were not only prevalent, but also quite deadly to the weakened body of the poor and starved.
Switch to today when brutal poverty is rare (here in Australia) and so overcrowding and malnutrition and relatively low. As a result infectious diseases present little problem in the community, except among the starved.
So if vaccines were introduced to cater for a sick, poor, malnourished population are they needed today where that isn't the case?
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