Molecular Screening and Characterization of Canine Coronavirus Types I and II Strains from Domestic Dogs in Southern Italy, 2019–2021

Figure 2

Maximum-likelihood phylogenetic tree based on 37 partial M gene sequences (370 nt) of canine coronavirus (CCoV-I and CCoV-II, as indicated) strains analysed in this study and reference CCoV strains, indicated by solid squares (▪). The phylogenetic tree was built with the maximum-likelihood method and the Tamura 3-parameter model with a discrete gamma distribution (bootstrap 1,000 replicates; bootstrap values greater than 60 are shown). Each sequence is indicated with the corresponding strain name and accession number.