Fig. 1.

Illustration of the known and potential host range of Middle East respiratory syndrome coronavirus (MERS-CoV). Dromedary camel is a demonstrated reservoir of MERS-CoV, but other species might act as hosts. In red: reported MERS-CoV-seropositive species and/or species in which virus has been naturally detected. In orange: other animal species that might be considered potential hosts since they are experimentally susceptible to MERS-CoV infection. Alpacas fit into both scenarios (red and orange). In black: animals (bats, to date) in which RNA of different sequences of MERS-CoV-like viruses have been found. Continuous arrows represent already described intra- and inter-species transmission events. Discontinuous arrows represent potential inter-species transmission.