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Have I used up all my vaccine antibodies?

Do we use up our vaccine antibodies each time we are exposed to covid?

I ask this because I have recently been exposed to covid on a daily basis whilst caring for an elderly relative. I managed to stay negative for a whole week before eventually testing positive. Then I went down hill rapidly. There is no doubt I was exposed for days, because I had my relative practically coughing in my face for days. It felt as though my vaccine antibodies (last booster 4 months ago) were keeping the virus at bay until all my antibodies were used up and then I just caught it big time. In fact I was really quite ill. Worse than my elderly relative. The WHO has this to say about vaccine lifespan…

“Immunity may reduce faster in people who are older or who have underlying medical conditions, or who have a high level of exposure to the virus”

It is this last part that I find interesting and is quite important for carers who may be exposed to covid over an extended period.
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20620809 tn?1504362969
I don't think it actually works that way.  Your antibodies are there and it is more a factor of TIME as to how long they last verses how much protection they've supplied you or how often you were around someone infected that the antibodies helped protect you against.  https://www.cdc.gov/coronavirus/2019-ncov/your-health/about-covid-19/antibodies.html  Obviously, the more you are exposed, the more chance of the virus eluding your antibodies but it doesn't 'use them up' faster.  
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Another forum also discussed that question. Here's one guy's answer.
"They don’t wear out. The cells stop producing antibodies and they start to wane, that is, the concentration in the serum goes down. This makes sense. The body can’t just keep on making antibodies against every microorganism it has encountered ad infinitum. That would be terribly wasteful. The memory cells from meeting the antigen would still be there. They can scale up production of antibodies quite quickly if needed. It has been shown that hospital front liners keep their antibody levels quite high, probably because of reinfection."
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