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HepatitisA is usually spread through human waste in water or food. It is in the same group of viruses as those that cause the disease polio

甲型肝炎通常是通过水或食物中的废物传播的。它与导致小儿麻痹症疾病的病毒属于同一组。

The hepatitis A virus causes high body temperature, pain and weakness. It causes problems with the stomach and intestines, making it difficult to eat or breakdown food.

甲型肝炎病毒引起体温升高、疼痛和疲惫。它会导致肠胃问题，引起进食或消化困难。

Hepatitis B spreads when blood from an infected person enters the body of another person.The virus can also spread through sexual activity, and if people share injection devices. 

乙型肝炎是通过被感染者的血液进入另一个人的身体传播的。该病毒还可以通过性行为传播。如果人们共用注射工具也会传播乙肝病毒。

The hepatitis C virus belongs tothe same group of viruses as yellow fever and West Nile virus. Most people living with hepatitis C develop chronic infections, often without any signs.

丙型肝炎病毒和黄热病、西尼罗河病毒属于同一组病毒。大多数丙型肝炎患者会出现慢性感染，往往没有任何迹象。

The only way to protect against infection is to receive vaccines against hepatitis A and B, and to avoid contact with the other viruses.

防止感染的唯一途径是接种甲肝和乙肝疫苗，并避免接触其他病毒。