Elsevier

Engineering

Volume 6, Issue 10, October 2020, Pages 1085-1098
Engineering

Research Coronavirus Disease 2019—Perspective
Natural Host–Environmental Media–Human: A New Potential Pathway of COVID-19 Outbreak

https://doi.org/10.1016/j.eng.2020.08.010Get rights and content
Under a Creative Commons license
open access

Abstract

Identifying the first infected case (patient zero) is key in tracing the origin of a virus; however, doing so is extremely challenging. Patient zero for coronavirus disease 2019 (COVID-19) is likely to be permanently unknown. Here, we propose a new viral transmission route by focusing on the environmental media containing viruses of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) or RaTG3-related bat-borne coronavirus (Bat-CoV), which we term the “environmental quasi-host.” We reason that the environmental quasi-host is likely to be a key node in helping recognize the origin of SARS-CoV-2; thus, SARS-CoV-2 might be transmitted along the route of natural host–environmental media–human. Reflecting upon viral outbreaks in the history of humanity, we realize that many epidemic events are caused by direct contact between humans and environmental media containing infectious viruses. Indeed, contacts between humans and environmental quasi-hosts are greatly increasing as the space of human activity incrementally overlaps with animals’ living spaces, due to the rapid development and population growth of human society. Moreover, viruses can survive for a long time in environmental media. Therefore, we propose a new potential mechanism to trace the origin of the COVID-19 outbreak.

Keywords

Environmental quasi-host
Patient zero
SARS-CoV-2
Pathway
Origin of COVID-19

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