Quote:
Originally Posted by jfman
It's never been successfully achieved with uncontrolled spread of a live virus through a population.
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Herd immunity via viral infection has obviously happened though a population before, it's what happened before vaccines. It's why we don't all drop dead from all the viruses out there in the world, it's why the normal flu doesn't kill us all, it's why such viruses did kill people in the Americas when colonialists arrived.
It's why people used to have Pox Parties to give children the illnesses now that were deadlier in adults.
Remember the way our immune system works is even if there are different strains of a virus if they're similar enough to the previous one then it can adapt quicker. Most of us have immune systems that can detect a new strain of flu vaccine being similar to another as thus cope with it better. That's why we don't
all need a flu vaccine.