The spreading or transmission of disease or infection from person to person; contagion.
風邪はくしゃみや手を介して伝染しやすい。
Colds are easily spread through sneezes and hands.
伝染を防ぐために、手洗いとマスクの着用が重要だ。
Handwashing and wearing masks are important to prevent contagion.
その病気は動物から人へ伝染することがある。
That disease can sometimes be transmitted from animals to humans.