Mucus- Spit or Swallow?

Dear Ask The Doctor:  I have searched for hours, but can't find a satisfactory answer. If you have a sinus infection, is it better to spit out the mucus that is draining, or swallow it? I have seen people saying swallowing it can be harmful, but I have also seen people saying it is actually better to swallow vs spit. Which is it? Thanks! 

Dear Patient: 

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