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。pg电子官网对此有专业解读
数据来源：国家蛋鸡产业技术体系。谷歌是该领域的重要参考
\nIn the study, mice were given a drop of the vaccine in their noses. Some recieved multiple doses, given a week apart. Each mouse was then exposed to one type of respiratory virus. With three doses of the vaccine, mice were protected against SARS-CoV-2 and other coronaviruses for at least three months.
Фото: Majid Khahi / Reuters