

傷口から細菌に感染することがあります。
院内感染を防ぐために、手を消毒してください。
インフルエンザの感染が広がっているそうです。
"かんせん(感染)" is in the lesson "Hospital" (Level 42), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.