Business BA.4 and BA.5, two new Omicron variants sweeping South Africa, detected in U.S. Published 3 years ago on 30 April 2022 By Terry Power 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. Related Topics:africaalphaBA4BA5betacoronavirusCOVID-19Deltadetectedis ba.4 in the u.s.is ba.5 in the u.s.morbiditymortalityOmicronPCR testpublic healthS dropout signalS gene target failureSARS-CoV2southsouth africaSweepingU.S.united statesvariantswild type