Pogue Mahone
The caf's Camus.
That’s because measles is so insanely infective. I think the R0 is something like 12. The lower the R0 the lower the % you need infected to get herd immunity. Nobody knows the true R0 for sars-cov2 yet but even if it’s as low as 1 (unlikely) you’d need to reach 50%+ infected.[
Surprising numbers - what it shows is how disastrous allowing covid to spread more across european communities would be given the number of deaths and only single digit seroprevalence to show for it
New York City residents with their dense population had something like 20% and they were the highest I can recall or rather have seen quoted, probably the reason death rates aren't higher there is due to demographics I'd think
I've heard it mentioned that you need a smaller number of immune patients to reach effective herd immunity threshold than you would for something like Measles and seen wide variations in percentages quoted but you'd need WAY more than the numbers listed above.
What it means I think is that this thing will be with us for a while with restrictions eased. Contact tracing, isolation of those infected, continued shielding unfortunately for the extremely vulnerable, mass testing and managing this thing at local levels in hot spots should now be prioritised rather than one-size-fits-all national-level guidelines which will be ignored en-masse anyway.
Having said that, even without herd immunity, the higher the previous exposure the smaller each subsequent outbreak.