普通の風邪は「普通感冒」の事を指し、症状としては、はじめはのどの痛み、くしゃみ、鼻みず、頭痛、だるさなどで、やがて鼻みずが粘り気をもってきて鼻が詰まったりしてきます。せきなども現れ、発熱（微熱から比較的高い熱）、吐き気、下痢を伴う場合もあります。
「普通感冒」の原因となるウイルスはさまざまですが、ライノウイルスやコロナウイルス、RSウイルスによるものが多く、複数のウイルスに、同時に感染していることもあります。
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