Phylogenetic relationships and species composition of host community influence the transmission of coronaviruses in sympatric bats.

Since the emergence of Severe Acute Respiratory Syndrome (SARS) in 2002, bats have been recognized as important reservoirs of diverse coronaviruses (CoVs). Despite extensive research on the broad geographic transmission of bat CoVs, there is a notable gap in understanding the transmission dynamics within sympatric bat communities. Using a phylogeographic Bayesian statistical framework, we examined CoV transmission patterns and their determinants in a region where four bat roosting caves coexist and CoVs circulate persistently. Our findings reveal that two subgenera of CoVs, α-CoVs and β-CoVs dominate different bat caves at varying times. Notably, β-CoVs show more frequent cross-species transmission events among the dominant reservoir hosts, bats of Rhinolophidae. Phylogenetic distance between host species emerges as the key influence factor of viral cross-species transmission, whereas cohabitation duration and the number of hosts sharing caves do not significantly influence viral transmission. In addition, we emphasize that the compositional similarity of species in the roosting caves is critical for the inter-cave transmission of bat-CoVs, rather than the distance between cave. These results provide novel insights into the complex transmission dynamics of bat CoVs within sympatric bat communities.