New COVID Omicron Variant Spreads BA.4 and BA.5 Have Become Dominant
New COVID Omicron Variant Spreads BA.4 and BA.5 Have Become Dominant The most recent subvariants of the Omicron variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), BA.4 and BA.5, have caused significant upsurge in new cases and hospitalizations in many countries around the world. Soon after their initial discovery in South Africa, BA.4 and […]
