The article totally ignores partial immunity, and I understand that it's complicated, but vaccination can drive an infection towards the asymptomatic state, and thus make silent carriers, which has its own problems.
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Two major problems it that a shift towards the asymptomatic range can actually increase the rate at which an infection spreads and efficacy of a vaccine is often estimated using cases, not infections.
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Is it "correct" to say that: the disease x infects 1.5 persons? Or 2.2? Doesn't this sound like one person and half body from another, or two persons and hands/legs from a third?
@alc_anthro any idea? -
It's an average. So on average, if an infection causes more than one new infection, the infection will tend to spread, while if on average it produces less than one new infection then it will tend to die out.
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