Abstract
Emerging infectious diseases have accompanied the development of human society while causing great harm to humans, and SARS-CoV-2 was only one in the long list of microbial threats. Many viruses have existed in their natural reservoirs for a very long time, and the spillover of viruses from natural hosts to humans via interspecies transmission serves as the main source of emerging infectious diseases. Widely existing viruses capable of utilizing human receptors to infect human cells in animals signal the possible outbreak of another viral infection in the near future. Extensive and close collaborative surveillance across nations, more effective wildlife trade legislation, and robust investment into applied and basic research will help to combat the possible pandemics of new emerging infectious diseases in the future.
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