US faces a double coronavirus surge as omicron advances

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 in a row.

The White House on Wednesday insisted there is no need for a lockdown because vaccines are widely available and appear to offer protection against the worst consequences of the virus. But even if omicron proves milder on the whole than delta, it may disarm some of the life-saving tools available and put immune-compromised and elderly people at particular risk as it begins a rapid assault on the United States.

“Our delta surge is ongoing and, in fact, accelerating. And on top of that, we’re going to add an omicron surge,” said Dr. Jacob Lemieux, who monitors variants for a research collaboration led by Harvard Medical School.

“That’s alarming, because our hospitals are already filling up. Staff are fatigued,” leaving limited capacity for a potential crush of COVID-19 cases “from an omicron wave superimposed on a delta surge.”

Most likely, he and other experts said at a press briefing Tuesday, an omicron surge is already under way in the United States, with the latest mutant coronavirus outpacing the nation’s ability to track it.

Based on specimens collected last week, the Centers for Disease Control and Prevention said omicron accounted for about 3% of genetically-sequenced coronaviruses nationally. Percentages vary by region, with the highest – 13% – in the New York/New Jersey area.

But Harvard experts said these are likely underestimates because omicron is moving so fast that surveillance attempts can’t keep up.

Globally, more than 75 countries have reported confirmed cases of omicron. In the United States, 36 states have...