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> How much of a risk does the use of antibiotics in meat present to a vegetarian?

Whatever the exact value, it's most likely much lower. At least you're not ingesting whatever is left in the meat which, by reading some of the responses here, seem to come with significant risk.

long-term yes, you're right - everyone is at risk due to over-use of antibiotics

I think quitting big meat is more about voting with your wallet, than directly reducing your risk from their antibiotics abuse.