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This means there is a small risk of "accidental unblinding" at this point in the study: if someone's sample tests positive for cholera on the sixth day after they've started the antibiotics, then the researchers know they got the real vaccine instead of the placebo! This is considered a necessary, acceptable trade-off, because of the public-safety aspect of making sure people are clean before they go home.
It's happened a small number of times out of all the study participants.
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