Therefore, the human-to-human transmission of this virus through coughing, sneezing, and the spread of respiratory droplets or aerosols was accepted. Although it had been proposed that the COVID-19 patients in China might have utilized infected animals as a foodstuff, or might have visited the seafood market, further investigation revealed that some patients had not visited the seafood market. It is thought that the Hunan seafood market in Wuhan city in China was the origin of the outbreak. The causative virus was initially called “novel coronavirus 2019” (2019-nCoV) by the World Health Organization (WHO), but it was then renamed as “severe acute respiratory syndrome coronavirus 2” (SARS-CoV-2) by the international committee of the Coronavirus Study Group (CSG), and the disease called “coronavirus disease 2019” (COVID-19) by WHO. Finally, after several cases of pneumonia with an unfamiliar etiology were observed at the end of 2019, the National Health Commission of China released more details about the epidemic in early 2020. Although the emergence of new coronavirus diseases, probably originating from bats in China, had been predicted by early March 2019, no international preventive action was taken.
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