现在还没有防艾滋病病毒传染的疫苗。
At present, no widely approved vaccine exists for malaria.目前没有被广泛认可的疟疾疫苗。
Researchers around the world are collaborating to develop a new vaccine.世界各地的研究人员正在合作培育一种新的疫苗。
More than that, the vaccin adopts a kind of dosage form by special process, which could overcome the destruction from gastric acidity or pepsin, thereby render the vaccin more effective and stabler.其次,它采用特殊工艺剂型,克服了胃酸、胃蛋白酶对疫苗的破坏作用,提高了疫苗的有效性和稳定性。