a medical mask is not required, as no evidence is available on its usefulness to protect non-sick persons. However,masks might be wornin some countries according to local culturalhabits.

Wearing medical masks when not indicated may cause unnecessary cost, procurement burden (medical staff can't get it, I guess) and create a false sense of security that canlead to neglectingother essential measures such as hand hygiene practices.Furthermore, using a mask incorrectly may hamper its effectiveness to reduce the risk of transmission.