The full course is pretty much overkill. The problem happens when people feel better after a few days and stop taking them. Then they gets sick again from the surviving bacteria that may be more resistant to the antibiotics or they go out drinking and spread it.
If they spread it, then you have an antibiotic resistant strain of bacteria on the loose. People don’t want to take seven days of antibiotics when they feel fine in three or four, you can’t drink on antibiotics and they wanna go out partying on the weekend. Taking antibiotics after you feel better (finishing the course) is just making damn sure you finish the buggers off.
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