FIG 1.

Ward room and bed layout (rooms 1, 2, and 3 in which cases accumulated are numbered). (A) In black, the distribution of SARS-CoV-2 cases throughout three periods (white beds correspond to noninfected cases); they are distributed in three time periods according to the dates for their SARS-CoV-2 diagnostic RT-PCR-positive results. (B) In orange, yellow, pink, blue, green, and black, the distribution of cases after having obtained the genomic data to differentiate between the involved strains (different cases were considered to be infected by the same SARS-CoV-2 strain when the corresponding sequences showed 0 to 1 SNPs between them). The letter codes correspond to the different strains as determined by WGS (Fig. 2).