New variants are poised to keep Covid-19 circulation at high levels throughout the summer
The next influx of infections will likely come from new subvariants of Omicron BA.4 and BA.5, two closely related viruses that were first characterized in South Africa and landed in the United States around the late March, according to the Gene Sequence Sharing Site. GISAID. These variants are gaining ground against BA.2, especially in the …