COVID-19 Omicron BA.4 Directory References Discover Where Is “Old Zealand”? 15 Nelson Mandela Quotes 6 Animals That Eat Their Mates Why Is the Mona Lisa So Famous? What Comes After Terabyte? Did Duchess Anastasia Survive Her Family’s Execution? 10 Great Sports Rivalries Contents COVID-19 Omicron BA.4 virus subvariant Ask the Chatbot a Question Ask the Chatbot a Question Learn about this topic in these articles:COVID-19 In COVID-19…multiple sublineages of concern, including BA.4 and BA.5, which are highly infectious, and BA.2, which gave rise to XBB.1.5—a highly transmissible variant, noted for its heightened ability to bind to cells and to replicate. Read More