摘要
Animals play an important role in our lives.Increased human-animal interactions lead to the transmission of zoonotic pathogens between animals and humans,directly threatening human health and societal development.Nearly all major public health events that occurred in the last several decades have been closely related to animal diseases.Approximately,60%of human infectious diseases are zoonotic,and 75%of emerging human infectious diseases originate from animals.As of April 20,2022,the global coronavirus infectious disease19(COVID-19)pandemic caused more than 503 million infections and more than 6.2 million deaths in humans.Over 11 billion doses of vaccines have been given to humans worldwide(WHO 2022).Despite the consensus among international organizations and animal experts that the SARS-CoV-2 originated from animals,the route of transmission between humans and other animals remains unclear.Furthermore,it is still a challenge for continually tracing the origin of SARS-CoV-2.
