PBS NewsHour | Clip | What we know about the severity of omicron, new COVID spikes
As the omicron variant is spreading rapidly, top federal health officials warn it could bring a massive wave of new infections to the United States as early as January. There are now confirmed cases of omicron in at least 36 states. The Centers for Disease Control and Prevention estimates the new variant represents about three percent of positive U.S. cases. John Yang reports.