RichardMEL
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This is all getting a bit OT but I'll disagree with you just a little bit.It's not a little less, it's much less.
Less likely to catch it in the first place, less likely to pass it on, and if there's a good percentage of others vaccinated, less likely for someone else to catch it if you are passing it on.
That's a triple reduction - we're at around 20% now but I'd say we'd have to be up around 50% at least before they start thinking of this.
When you say you're less likely to "catch it" in the first place. Well depends what one means by "catch it" - your exposure risk is exactly the same - vaccinated or not - but it's how your body reacts to the virus. In theory, fully vaccinated people will have antibodies fighting the virus once exposed. Therefore one may or may not show symptoms still (which is the only realistic way one may determine if they have "caught it" outside of a test of course) and yes, with antibodies fighting the virus it should be killed off far far quicker than if the body was first exposed to the virus (ie: unvaccinated). And thus with the shorter lifespan of the virus within the body once exposed, it will be shed much less - meaning that a vaccinated person who has produced antibodies will yes, be far less of a risk to spread because the virus will be alive within them for far less time.
and yes, I do absolutely agree you're describing herd immunity in terms of the percentage of the population who are vaccinated are in a group together if the virus is introduced somehow while it may still spread around that group - the chain should end there as it will get quickly killed off within that group and can't spread further.
As you say, right now the % of the general population who are fully vaccinated (ie the recommended two jabs) is far too low (I think the fully vax number is under 10% at this point, far more have the first shot of course - we're only now starting on the second AZ jabs for those that started to be vaccinated late in March) and with limited supplies of Pfizer and Moderna coming much later in the year it's still going to be some time off before a mrjority of the populaion CAN be vaccinated to a point where we can be discussing herd immunity - ignoring the vax hesitancy issues which are a real factor of course - I think these things are all part of the fed gov's pushing back international border openings till mid next year.
Anyway my point was more that a vaccinated person can still "catch it" (ie: be exposed) as much as unvax. It's about the body's response in fighting it off that affects the virus shedding(ie: spreading it) and how unwell someone may be from it. The only way to lower the exposure risk, as you say, is to get that herd immunity going.
my 14 cents worth