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Airflow is often not clearly understood in relation to transmission of various diseases. In 1970 a German Election contracted the disease Smallpox after doing work in Pakistan. He ended up in a Smallpox hospital in Germany. Two things made his case interesting. Prior to contracting Smallpox, he had a cold which gave him a cough. The other was he was a smoker. Cough is not a symptom of Smallpox. The patient would go to the window and smoke, of course he would cough as well. Other people in the hospital contracted the disease. The cause was his cough. This led to studying how air moves in, and around a hospital. History would repeat it self with MERS (Middle Eastern Respiratory Syndrome) in a Korean Hospital. So when someone asks you mask think about the way a disease can be transported.