What does 感染 mean?
感染 is a Japanese noun meaning “infection, contagion” in English. It can also be translated as “being infected (e.g. with harmful ideas)” depending on context. It is written as 感染 in kanji, かんせん in hiragana, and kansen in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
「トイレの便座からエイズが感染することってあるの？」「いいえ、ありません」
"Is it possible to catch AIDS from toilet seats?" "No, it isn't."