SEATTLE — State health officials said Tuesday at least 400 cases of the new COVID-19 variant had been confirmed, but that omicron hasn’t yet overtaken delta cases in the state.

“Our early surveillance from a lab standpoint was very much related to detecting omicron in our state,” state Health Secretary Dr. Umair A. Shah said at a news conference. “Now we have to shift to do more representative sampling across the entire state so we can get a better picture of how and where it’s spreading.”

Over the past two weeks the state has averaged more than 1,500 new, likely cases of COVID-19 a day. Hospitalizations and deaths remain consistent, but Washingtonians will likely be in for a “difficult winter” of both influenza and omicron because health care systems are already strained, state epidemiologist Dr. Scott Lindquist said.

The Seattle Times reported that statewide, about 81.7 percent of residents 12 and older — about 5.4 million people — have received at least one vaccine dose, while about 75.3 percent are fully vaccinated. About 1.7 million Washingtonians had received an additional vaccine dose as of Tuesday.

Health authorities urged eligible people to get booster shots. Shah acknowledged recent challenges in securing booster appointments, assuring residents the health department is taking “aggressive” steps to increase appointment capacity.

More information about increasing capacity for booster appointments will be available in the next couple days, according to Shah. In the meantime, he said, masking, distancing, avoiding crowds and getting tested for the virus will be important.

“This pandemic is far from over,” Shah said.

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