By Laura Ungar Scientists and health officials around the world are keeping their eyes on a descendant of the omicron variant that has been found in at least 40 countries, including the United States. This version of the coronavirus, which scientists call BA.2, is...
By LAURA UNGAR Get ready to learn more Greek letters. Scientists warn that omicron’s whirlwind advance practically ensures it won’t be the last version of the coronavirus to worry the world. Every infection provides a chance for the virus to mutate, and omicron has an...
By LAURA UNGAR and CARLA K. JOHNSON The new omicron coronavirus mutant speeding around the world may bring another wave of chaos, threatening to further stretch hospital workers already struggling with a surge of delta cases and upend holiday plans for the second year...