A new variant of COVID-19 found in Africa has international health organizations and national leaders again concerned about virus restrictions. A group of World Health Organization experts has called the variant “omicron,” a letter in the Greek alphabet like “delta.” Belgium and Israel said travelers who came from Africa recently tested positive for the variant. It is not clear whether the new version of the virus causes more severe health problems. But nations are trying to prevent its spread. The health minister in Belgium called the variant “suspicious.” Frank Vandenbroucke said: “We don’t know if it’s a very dangerous variant.”