I've had questions about this. I know that the bacteria that causes meningitis is the same one that causes pneumonia. There is a vaccine for meningitis yet nearly 52,000 people die of pneumonia in 2009. I understand that there may be different strains that caused this to happen, but I didn't understand that there were as many as 90 different strains! The vaccines only cover about seven.
This is a very interesting article.
How bacteria behind serious childhood disease evolve to evade vaccines
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