@Sonex there are some studies showing lasting immunity even after mild infection. I linked and quoted from one upthread.
@Scottishskifun
I would say that if the ongoing studies show that immunity lasts then the time for presumptive immunity will be increased again. We don’t currently ask people who have been infected to prove their immune status, we just assume they’re immune for a certain period of time (6/9 months currently) based on the findings from the studies.
Vaccinated people aren’t asked to ‘prove’ their immune status even though protection against infection wanes faster so I’m not sure why you think the bar should be set higher for natural immunity.
Re small studies, from hiqa:
“ The updated evidence summary identified 19 large cohort studies involving over 640,000 previously infected individuals, including six studies with over ten months’ follow-up. Across studies, the risk of SARS-CoV-2 reinfection was consistently found to be low. No study reported an increase in reinfection risk over time. More limited data were identified in relation to the immune response to SARS-CoV-2 infection. The identified studies suggest that immune memory develops in most or all people that have been infected with SARS-CoV-2 and lasts for at least nine months.”
@Reallybadidea
I’m not really sure what you want me to say. If the studies found that immunity after the vaccine and after infection were the same then that’s what I’d be saying. That’s not the case though. Again, I don’t think this evidence undermines the vaccine. Even if vaccinated people are infected then they are likely to have a mild illness. It does undermine the idea of vaccine passports though.