FIG 1  Phylogenetic analysis of HCoV-NL63 based on complete genomes. The complete genomes of 69 coronavirus references were obtained from the GenBank database, and multiple alignments were performed using MAFFT version 7.158 with default parameters. The phylogenetic tree was constructed using the neighbor-joining method with 1,000 bootstraps in MEGA version 5.10 with default parameters. The numbers at the nodes represent bootstrap support. Bootstrap values greater than 70% were considered statistically significant for grouping. The HCoV-NL63 strains presented in this study are marked with red circles.