WEST PALM BEACH, Fla. (WPEC) — As omicron cases fall across some parts of the United States, international health officials are now warning about a new variant. "BA. 2" is a sub-variant of omicron and has been labeled “variant under investigation" by health officials in the United Kingdom who say they are now monitoring the newest strain. Also dubbed "stealth omicron," the World Health Organization is reporting cases of BA. 2 in more than 40 countries including the U. S.