OC43 is relevant- worth remembering that NL63 and HKU-1 were discovered after SC1 and as a result of virus hunting driven by SC1. https://www.ncbi.nim.nih.gov/pmc/articles/PMC3194943/ "Before the SARS epidemic in 2003, there were only 19 known coronaviruses, including 2 human, 13 mammalian, and 4 avian coronaviruses. After the SARS epidemic, more than 20 additional novel coronaviruses have been described with complete genome sequences (9, 24-26, 31, 42, 45, 50, 53, 54, 57). These include 3 human coronaviruses, 15 mammalian coronaviruses, and 4 avian coronaviruses. For human coronaviruses, human coronavirus NL63 (HCoV-NL63) (an alphacoronavirus) and human coronavirus HKU1 (HCoV-HKU1) (a betacoronavirus) have been discovered in addition to the two previously known human coronaviruses, human coronavirus 229E (HCoV-229E) (an alphacoronavirus) and human coronavirus OC43 (HCoV-OC43) (a betacoronavirus), as well as SARS-CoV (a betacoronavirus) (9, 45, 53, 56)"