PMC:7386875 / 4651-5843
Annnotations
{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7386875","sourcedb":"PMC","sourceid":"7386875","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7386875","text":"Since the beginning of the 21st century, 3 beta coronaviruses have been found to cause severe respiratory illness in humans, including SARS-CoV, MERS-CoV (Middle Eastern respiratory syndrome coronavirus), and now SARS-CoV-2. Coronaviruses reside in many animal hosts and can adapt to different species, including humans. The proximal origin of SARS-CoV and SARS-CoV-2 is thought to be bats, while the reservoir host for MERS-CoV is the dromedary camel.1–3 Previous data suggest that in order for coronaviruses to exhibit efficient zoonotic transmission, the virus must undergo natural selection in an animal host (ie, intermediary species) such that it acquires features affording tropism to human tissue. To date, the intermediate host for SARS-CoV-2 is not known, however, a closely related coronavirus to SARS-CoV-2 has been identified in Malayan pangolins.4 Moreover, it remains to be established whether SARS-CoV-2 has acquired genomic changes within an intermediate animal host before the occurrence of human transmission, or whether a SARS-CoV-2 progenitor may have undergone genomic changes during undetected human-to-human transmission, ultimately resulting in the current 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