伝染病（でんせんびょう、denseんbyou）
- infectious disease

The Japanese word 伝染病, read as でんせんびょう (densenbyou), means "infectious disease," "contagious disease," or "communicable disease." It refers to a disease that can spread from one person or animal to another, typically through direct or indirect contact, air, or vectors like insects. This can range from common illnesses like the flu to more serious conditions. It's a broad term encompassing various types of infectious illnesses.

⚫︎ あの国では、伝染病が流行しています。 Translation: An infectious disease is prevalent in that country. ⚫︎ 病院で、伝染病患者の隔離が行われました。 Translation: Isolation of patients with infectious diseases was carried out in the hospital. ⚫︎ 伝染病の予防には、手洗いが大切です。 Translation: Washing hands is important for preventing infectious diseases.

You use 伝染病 in contexts where you're discussing illnesses that are contagious or can be transmitted. It's suitable for both formal and informal situations when talking about the spread, prevention, treatment, or impact of such diseases. It's a commonly used word in medical contexts, news reports, and general conversations about health. You would typically use this word when talking about the disease itself, or actions related to it, like prevention or spread.

伝染病 is written using the following: ⚫︎ Kanji: 伝染病 ⚫︎ Hiragana: でんせんびょう There are no other common ways to write this word. The okurigana (送りがな) for 病 is "びょう" and never changes.

⚫︎ 感染症 (kansenshou) - infection, infectious disease (broader term) ⚫︎ 流行病 (ryuukoubyou) - epidemic, prevalent disease ⚫︎ 伝染性疾患 (densensei shikkan) - infectious disease (formal)

While there isn't a direct antonym, words describing non-contagious or non-infectious illnesses could be considered the opposite in concept. Some examples include: ⚫︎ 非感染性疾患 (hikansensei shikkan) - non-infectious disease

新型のコロナウイルスは非常に感染力が強く、世界中で伝染病を引き起こしました。 ・Translation: The new strain of coronavirus is highly contagious and caused an infectious disease worldwide. ・Explanation: This sentence describes the infectious nature and impact of the coronavirus using 伝染病.

医師は、その患者が伝染病にかかっているかどうかを確認するために検査を行いました。 ・Translation: The doctor conducted tests to confirm whether the patient had an infectious disease. ・Explanation: This sentence illustrates the use of 伝染病 in a medical context, highlighting the diagnostic process.

The word 伝染病 is composed of two kanji: 伝 (den), meaning "to transmit" or "to spread," and 染 (sen), meaning "to dye," "to stain," or "to infect." 病 (byou) means "illness" or "disease." So, 伝染病 literally means "a disease that spreads or infects," accurately capturing its meaning as an infectious or contagious illness.