News Social Impact BA.4 and BA.5, two new Omicron variants sweeping South Africa, detected in U.S. – Fortune Julio Marchi April 30, 2022 BA.4 and BA.5, two new Omicron variants sweeping South Africa, detected in U.S. FortuneView Full Coverage on Google News BA.4 and BA.5, two new Omicron variants sweeping South Africa, detected in U.S. | Fortune You need to enable JavaScript to view this site. Post navigation Previous: Chinese Omicron-specific mRNA COVID vaccine candidate to be trialed in UAE – ReutersNext: Washington parties on, as Covid threatens to crash the festivities – NBC News More Stories Social Impact Once-promising anti-inflammatory drug fails to improve long-COVID functional outcomes in trial Julio Marchi October 23, 2025 Social Impact IDSA releases COVID vaccine guidance for people with weakened immune systems Julio Marchi October 22, 2025 Social Impact COVID mRNA vaccines may be able to train immune system to attack cancer cells, boost survival Julio Marchi October 21, 2025