The genetic materials inside of virus particles, and the strategy by which the material is replicated, may differ considerably involving differing types of viruses. 国家安全国家安全部组织召开中央和国家机关国家安全人民防线建设工作会议 Viral infections in animals provoke an immune response that usually eliminates the infecting virus. Immune responses can also be produced by vaccines, wh... https://www.youtube.com/watch?v=DSqk-4qdNtI