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[Progress in source tracking of SARS-CoV-2]
1Department of Epidemiology, School of Public Health, Guangdong Provincial Key Laboratory of Tropical Disease Research, Southern Medical University, Guangzhou 510515, China.
Nan Fang Yi Ke Da Xue Xue Bao = Journal of Southern Medical University
|December 31, 2020
Summary
The origin of SARS-CoV-2 remains unknown, though evidence suggests a bat coronavirus ancestor. Research highlights challenges in tracing the virus
Area of Science:
- Virology
- Epidemiology
- Evolutionary Biology
Background:
- The Coronavirus disease 2019 (COVID-19) pandemic, caused by SARS-CoV-2, has resulted in millions of cases and deaths globally.
- The precise origin and initial transmission pathway of SARS-CoV-2 remain undetermined, posing significant challenges to public health.
- Existing research suggests a potential origin from bat coronaviruses tens of thousands of years ago, involving extensive evolutionary variations.
Purpose of the Study:
- To review current research on SARS-CoV-2, focusing on its origin, hosts, and transmission mechanisms.
- To identify existing problems and limitations in current SARS-CoV-2 research.
- To provide insights and inspiration for future research directions concerning the virus's origins.
Main Methods:
- Literature review of existing scientific studies on SARS-CoV-2.
- Analysis of genomic data and evolutionary pathways of coronaviruses.
- Examination of evidence regarding potential animal hosts and interspecies transmission.
Main Results:
- Evidence suggests SARS-CoV-2 may have originated from bat coronaviruses 40-70 years ago, undergoing significant mutations and natural selection.
- Various animals, including felines and canines, are considered potential hosts, with evidence of human-to-animal and animal-to-animal transmission.
- Current research indicates China is not the original source of SARS-CoV-2, and the exact transmission route to humans is still unclear.
Conclusions:
- The origin of SARS-CoV-2 is complex, influenced by evolutionary processes and host interactions.
- Further research is crucial to pinpoint the virus's origin, identify intermediate hosts, and understand cross-species transmission mechanisms.
- Determining the origin is essential for preventing future pandemics and developing effective control strategies.
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