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据悉,美国研制出一种新的家禽疫苗,由于这种疫苗能防止母鸡把病原传播给鸡蛋,从而可大大减少鸡蛋受沙门氏菌的感染。该种疫苗还可有效地
It is reported that the United States has developed a new poultry vaccine, due to the vaccine to prevent hens from transmitting the pathogen to the egg, which can greatly reduce the egg by Salmonella infection. The vaccine is also effective