Second, the severity of COVID-19 symptoms falls between SARS-CoV and the four community HCoVs (i.e., HCoV-229E, HCoV-OC43, HCoV-HKU1, and HCoV-NL63).
Tangu wakati huo, maarifa zaidi yalikusanywa kupitia utafiti wa kina kuhusu virusi vya HCoV-229E na HCoV-OC43, vyote vikiwa ambavyo husababisha dalili za udhaifu wa kibinafsi.