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1983年4月,委内瑞拉西部开始对Yucpa印第安人进行乙型肝炎疫苗免疫接种.先对所有成人及3岁以上儿童采血检测乙型肝炎病毒感染情况.所用的疫苗是由Merck药厂生产的血源性疫苗.成人及9岁
Hec-Hepatitis Vaccines were started in western Venezuela in April 1983. Hepatitis B virus infection was detected in all adults and children over the age of 3. The vaccine used was blood from Merck Pharmaceuticals Sexual vaccine. Adult and 9 years old