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OLYMPIA — The Washington State Department of Health Dec. 24 situation report shows substantial decreases in transmission but still not enough to return the state to the lower levels of disease activity seen earlier in the fall. Based on the timing of this trend, the plateaus may be due in part to the current restrictions on gatherings and certain businesses.

Report findings include:

• The state remains in a highly precarious situation. The estimated proportion of the population with active COVID-19 infections is around the same as mid-November, and hospitalizations are higher. If we do not maintain the behaviors that have lowered transmission over the past month, we could see exponential growth again –starting from a much higher baseline.

• COVID-19 transmission is plateauing, but hasn’t decreased enough. The best estimate of the reproductive number (how many new people each COVID-19 patient will infect) on Dec. 5 was 1.03 in western Washington and 1.11 in eastern Washington. The goal is maintaining a reproductive number well below one – meaning COVID-19 transmission is declining – for a substantial amount of time.

• Thirty-one of 39 counties had rates above 200 new cases per 100,000 people over the past two weeks. Sixteen counties had two-week rates above 500 new cases per 100,000 people. This indicates COVID-19 activity is still high and widespread in the state.

• Mid and small-sized counties are plateauing. Some mid-sized counties (Benton and Cowlitz) and some small counties (Douglas, Okanogan and Walla Walla) have seen flattening to pre-Thanksgiving levels. Other mid-sized counties (Grant, Kitsap, Skagit and Yakima) and small counties (Grays Harbor, Lewis and Mason) have seen flat or declining trends, but still have higher case counts than before Thanksgiving.

• Cases and hospitalizations started to plateau just before Thanksgiving, then rebounded again after the holiday. This drop was likely due to fewer people seeking care or getting tested over Thanksgiving, rather than an actual decrease in COVID-19 activity. There have been some declines in cases statewide and in hospitalizations in western Washington since then. Hospitalizations in eastern Washington have remained level.

• Daily hospital admissions of patients with confirmed COVID-19 have been relatively flat statewide since early December. Admissions increased gradually through Oct. 31, accelerated through Nov. 23, briefly dropped over the week of Thanksgiving, then rebounded until early December. We expect high hospital occupancy to last beyond drops in admission since COVID-19 patients generally stay in the hospital longer than one day.

• Despite some hints of progress, hospitals and intensive care units (ICUs) remain stressed. In western Washington, the number of hospital beds occupied by COVID-19 patients increased rapidly in early November then slowed in early December.

• The estimated overall percentage of Washington state residents with active COVID-19 infection was still higher than the peak in late March. The best model-based estimate as of Dec. 5 was 0.41%. Prevalence estimates started to flatten in mid-November, but remain several times higher than at the start of October.

“Because of the high levels of disease activity Washington state has seen this fall, we are looking for more than just a flat trend. We need to see a significant decrease in cases and hospitalizations, and the only way to get there is to intensify our current efforts to control the spread of the virus,” said Dr. Umair A. Shah, secretary of health at DOH. “It is encouraging to see that those efforts have helped the state avoid a post-Thanksgiving spike.

If we want to maintain this progress going into the new year, we must take every precaution possible including limiting in-person celebrations to our immediate households.”

Source: Wa DOH