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Coronavirus diseases are a type of virus that causes the common cold and usually do not cause serious symptoms.
However, it can sometimes mutate and cause serious infections, and the illness that results is called new-type coronavirus infection, novel coronavirus infection disease (新型コロナウイルス感染症, shingata koronauirusu kansenshō), as its known in Japan.
Three types of new coronavirus infections have been treated so far: SARS (severe acute respiratory syndrome), MERS (Middle East respiratory syndrome), and COVID-19.
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Coronavirus diseases - Wikipedia
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SARS-CoV-2とは (サーズシーオーブイツーとは) [単語記事] - ニコニコ大百科 (NicoNico Encyclopedia)