so you have no specific reference that relates to covid?
Just a general ‘it happens with some/most/many viruses, so ‘common sense’ means it must be true of covid.
I prefer to wait for actual evidence, since covid behaves in ways that vary significantly from some/most/many viruses.
edited to add: thank you. Your second post gives an actual study on covid. I will read it now.
edited again, to add: What a pity. The study you linked to is for a minute number of people (compared with, say, the population of Israel, or the UK) over 5 months, they only compared natural immunity with the Oxford AstraZeneca vaccine, not the other vaccines, and they used old outdated figures claiming the AZ is only effective at 62.1%. They should update that.
@bulkbiker I still don’t think your blanket claim is validated by that study. Got any more?