Coronavirus 2019 (COVID-19) Variants: Coronavirus-2019 (COVID-19), Human Coronaviruses, 1965-Present, COVID-19 Variants and Subvariants https://emedicine.medscape.com/article/2500142-overview?src=soc_tw_220218_mscpedt_news_student_subvariants&faf=1#a1