Coronavirus Diversity Coronaviruses are members of the subfamily Coronavirinae in the family Coronaviridae and the order Nidovirales. This subfamily consists of four genera — Alphacoronavirus, Betacoronavirus, Gammacoronavirus and Deltacoronavirus. The alphacoronaviruses and betacoronaviruses infect only mammals. The gammacoronaviruses and deltacoronaviruses infect birds, but some of them can also infect mammals.
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Fig.2 The phylogenetic tree of coronaviruses. (Cascella, 2020)