Why do couples have to abstain from sex when BOTH are being treated for chlamydia?

If both people in a relationship test positive for chlamydia and both are on the same antibiotic treatment AT THE SAME TIME, why do they still have to abstain from having sex WITH EACH OTHER during those 7 days the azithromycin clears the infection? You would think that since both are being treated simultaneously... show more If both people in a relationship test positive for chlamydia and both are on the same antibiotic treatment AT THE SAME TIME, why do they still have to abstain from having sex WITH EACH OTHER during those 7 days the azithromycin clears the infection? You would think that since both are being treated simultaneously that both of their bodies are hostile environments to the bacteria and any "passing back and forth" would be taken care of by the same regimen. Am I missing something?
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