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A comment on Nearly 40% of Icelanders are using a Covid app, but it hasn’t helped much. Parent comment

Re:Nearly 40% of Icelanders are using a Covid app, but it ha... by tomp on Saturday May 16, 2020 @05:25PM (#23207341)
Risk vs reward. If there is immunity, then developing herd immunity sooner rather than later is important (even more so if there's immunity but it's only short-term). If there's no immunity, we're, excuse the expression, fucked anyhow.

Can vaccines even be developed if there's no natural immunity?

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Re:Nearly 40% of Icelanders are using a Covid app, but it ha... by orwin on Saturday May 16, 2020 @06:30PM (#23207728)
If there is short term immunity yes (diphteria, tetanos is an example, polio too).

Being exposed to the same antigen while you have an immunity should reactivate this immunity, that's a reason why a "herd immunity" tactic could work, at least for a time

However if the natural immunity w/o reactivation only last a year or less, you will end up with a new outbreak at the end of the period. And if the immunity period is shorter than the recuperation one, you will have a virus that will be a lot more lethal.

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