The S protein of SARS-CoV-2 shared 93 and 97% amino acid identity with Bat CoV RaTG13 and Pangolin-CoV, respectively (Zhang et al., 2020b; Special Expert Group for Control of the Epidemic of Novel Coronavirus Pneumonia of the Chinese Preventive Medicine Association, 2020; Zhou et al., 2020). Here, PROS1 is linked to susceptibility to pneumonia measurement.