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美国一家制药公司最近宣布在美国供应一种能预防乙型肝炎的新疫苗,这种新疫苗是用遗传工程技术研制成功的。乙型肝炎是肝炎中比较严重的一种,它常常会导致肝硬化和肝癌等肝脏疾病。许多人带有乙型肝炎病毒而自己不知道,容易传染给别人。目前全世界带有乙型肝炎病毒的大约有一亿七千万人。乙型肝炎病毒主要是散布在血液和体液里面,如果和病人的身体接触就有可能传
A U.S. pharmaceutical company recently announced the supply of a new vaccine against hepatitis B in the United States that has been successfully developed using genetic engineering techniques. Hepatitis B is one of the more serious forms of hepatitis. It often leads to liver diseases such as cirrhosis and liver cancer. Many people with hepatitis B virus do not know it and can easily transmit it to others. At present, there are about 170 million people in the world with the hepatitis B virus. Hepatitis B virus is mainly spread in the blood and body fluids, if the contact with the patient’s body may be transmitted