So far, seven kinds of “coronaviruses” that infect humans have been found, and one of them is the so-called “new coronavirus (SARS-CoV2)” that has been a problem since last December. Of these, four types of viruses account for 10 to 15% (35% during the epidemic) of common cold causes, and many are mild. The remaining two viruses are “Severe Acute Respiratory Syndrome (SARS)” that occurred in 2002 and “Middle East Respiratory Syndrome (MERS)” that has occurred since 2012. Coronaviruses can infect all animals, but rarely infect other animals of different species. It is also known to lose its infectivity by alcohol disinfection (70%).