As this pandemic is upon us, you might some day, despite your best self- containment and other efforts, find yourself having been exposed, too close to someone who coughed or a positive test on a friend. In this covid-19 infection, there can be high levels of virus in the upper airway, in the nose and throat, without much symptoms but high contagiousness. So the risk is there.
One thing I have not seen much about is the hot steam inhalation to help weaken the virus and potentially eliminate it. It is a preventive measure in the sense of: don’t wait till there are symptoms.