How Many States Is Omicron in Now?

The highly mutated Omicron variant of the coronavirus had been reported in at least 16 states by Saturday, with Washington state reporting three new cases.

Many of the cases appeared to be people who had traveled to South Africa recently, including the first case reported Saturday in Wisconsin by the state’s department of health. Some, however, seemed to be examples of community spread, including an infected person in Hawaii who had not traveled outside of his state, and a man in Minnesota who attended an anime convention in New York City. Regardless, health officials were bracing for the inevitable community spread of the variant.

Late Saturday, Gov. Ned Lamont reported Connecticut’s first case, a man in his 60s whose relative had recently attended the anime convention. Additional family members were being tested, and both the man and his relative were fully vaccinated and experiencing only mild symptoms.

None of the Omicron cases reported so far in the United States have resulted in serious illness, hospitalization or death.

The Washington State Department of Health said three adults from three different counties — Thurston, Pierce and King — had tested positive for Omicron. They were being informed, and their conditions were unknown.

Even as concerns about the Omicron variant intensified, top federal health officials said that for now the Delta variant remained a greater threat to Americans.

“I know the news is focused on Omicron, but we should remember that 99.9 percent of cases in the country right now are from the Delta variant,” Dr. Rochelle P. Walensky, the director of the Centers for Disease Control and Prevention, said in a press briefing on Friday. “Delta continues to drive cases across the country, especially in those that are unvaccinated.”

About 104,000 cases were being reported in the United States every day, compared with about 12,000 per day six months ago. States in the Midwest are recording some of the biggest spikes, while New Hampshire, Michigan and Minnesota lead the country in recent cases per capita.

On Friday, state health officials confirmed three cases in Maryland, all in the Baltimore area. Two of the cases are from the same household and include a vaccinated individual who had recently traveled to South Africa and an unvaccinated person who was deemed a close contact. The third case is unrelated, and the patient, who was vaccinated, has no known recent travel history.

Officials in Philadelphia said that they had found one case, a man in his 30s. The sole case identified in Utah was a vaccinated individual who had just returned from South Africa. In Missouri, officials identified a case linked to domestic travel.

Gov. Philip D. Murphy of New Jersey said that a fully vaccinated woman who had recently traveled to South Africa tested positive for the Omicron variant after being treated at an emergency department in northern New Jersey. She was in isolation with mild symptoms, officials said.

On Thursday, officials in New York State announced that they had confirmed five cases of the variant: a 67-year-old woman in Suffolk County who returned from South Africa; two residents of Queens; one resident of Brooklyn; and another person in New York City who had traveled recently. The vaccination status of most of the individuals remained unknown.

A vaccinated Colorado resident who had recently returned from southern Africa was that state’s first confirmed case.

California reported several cases — the first being in San Francisco on Wednesday. In Alameda County, health officials confirmed five new cases of the Omicron variant that were “mildly symptomatic,” part of a cluster of 12 local coronavirus cases linked to people who attended a wedding in Wisconsin on Nov. 27. One of the individuals at the wedding had recently traveled internationally, the Alameda County Public Health Department said. Guests who tested positive had all had been vaccinated and none had been hospitalized. Genomic sequencing to detect the variant had not been completed on all 12 cases.

The authorities in Nebraska on Friday said that of the six cases involving the Omicron variant found there, only one was in a vaccinated person. One of the infected people had returned from Nigeria on Nov. 23, they said, and the other five were likely exposed through household contact. None had required hospitalization.

An Oahu resident with no history of travel is the first Omicron case in Hawaii.

“This is a case of community spread,” the state’s department of health said in a news release. The individual had previously been infected with the coronavirus but was never vaccinated.