BlueAnorak
Well-Known Member
- Joined
- 31 Oct 2010
- Messages
- 28,106
Looks like the modellers forgot about it in their recent models then. :-DThis effect is called "population heterogeneity" and is included in the more sophisticated models of covid. It reduces the level at which herd immunity effects can be seen.
It's been used quite a bit by "sceptics" to entirely wrongly argue that herd immunity had already been achieved at various points in the pandemic, but the fundamental concept is sound. I'm not aware of any dynamics which imply repeated cycles as you suggest.
See for instance
Science | AAAS
science.sciencemag.org
The downside being that when the weather gets cooler larger areas become susceptible to the spread of the virus and it can make a come back.