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Aside from filtering, warming, and humidifying the air you breathe, the nose is your first line of defense against allergens and pathogens. The mucus and cilia inside are designed to block these outside invaders from going farther down the respiratory tract and making you sick. And NO, which is what the sinuses release when you breathe through your nose, is a vasodilator, meaning it relaxes the blood vessels and lowers blood pressure.

"Prosociality is endemic. In a common experiment called the social dilemma, anonymous subjects choose between a "defection" strategy that maximizes their own personal payoffs, and a "cooperation" strategy that gains them slightly less, but gives other members of the group substantially more. Up to 97% of subjects choose cooperation in some social dilemmas. Not surprisingly, researchers have found that the incidence of such prosocial behaviors declines as the personal cost of acting prosocially rises. We are more likely to be nice when it only takes a little, not a lot, of skin off our noses. But the scientific evidence demonstrates the vast majority of people will make at least small sacrifices to follow their conscience and help others."

Bart Haagmans (Erasmus MC) concludes: "The observations made in this study provide definite proof that SARS-CoV-2 can multiply in cells of the gastrointestinal tract. However, we don't yet know whether SARS-CoV-2, present in the intestines of COVID-19 patients, plays a significant role in transmission. Our findings indicate that we should look into this possibility more closely." The current study is in line with other recent studies that identified gastrointestinal symptoms in a large fraction of COVID-19 patients and virus in the stool of patients free of respiratory symptoms. Special attention may be needed for those patients with gastrointestinal symptoms. More extensive testing using not only nose and throat swabs, but also rectal swabs or stool samples may thus be needed.