Do you cover your mouth??

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We all open our mouth when yawn. We also sometimes sneeze or cough which also includes opening of mouth and throwing out out germs into the atmosphere or someones face. Anyways question is do you cover your mouth with your hand at these instances?? If I am at home I yawn with my mouth wide open and I don't care but if im outside I take care of covering my mouth. If I am coughing or sneezing I always make sure I cover my mouth. Yeah almost forgot we also burp. I try to cover . When outside definitly. What about you people?? Happy myloting and thanks for your time!!