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Greenbank
duncs
But that becomes material if it means everyone infects half the number of people.
If R is 1.5 for example, and you start with 100 people with the virus, after 5 rounds you'd have 10*(1.5^5) = 75.9 infections.
With a 50% effective vaccine then that 1.5 I'd have thought becomes 0.75, so after 5 rounds the 10 people with the virus is 2
(I'm sure I've vastly simplified things, but a number that doesn't look too spectacular from the point of view of one person can actually be significant when applied to an exponential spread across a population)
Edit: the above assumes the entire population have received the vaccine, which is unrealistic. But principle is still there