Race against new strains heats up

Coronavirus deaths and cases per day in the U.S. dropped markedly over the past couple of weeks but are still running at alarmingly high levels, and the effort to snuff out COVID-19 is becoming an ever more urgent race between the vaccine and the mutating virus.

The government’s top infectious-disease expert, Dr. Anthony Fauci, said the improvement in numbers around the country appears to reflect a “natural peaking and then plateauing” after a holiday surge, rather than the arrival of the vaccine in mid-December.

The U.S. is recording just under 3,100 deaths a day on average, down from more than 3,350 less than two weeks ago. New cases are averaging about 170,000 a day after peaking at almost 250,000 on Jan. 11. The number of hospitalized COVID-19 patients has fallen to about 110,000 from a high of 132,000 on Jan. 7.

States that have been hot spots in recent weeks such as California and Arizona have shown similar improvements during the same period.

Caitlin Rivers, an epidemiologist at the Johns Hopkins Center for Health Security, said too few people have been vaccinated so far for that to have had a significant impact on virus trends. She said she can’t predict how long it will take for the vaccines’ effects to be reflected in the numbers.

Rivers said she is concerned that the more contagious variants of the virus could lead to a deadly resurgence later this year.

“I think we were on track to have a good — or a better, at least — spring and summer, and I’m worried that the variants might be throwing us a curveball,” she said.

Nationwide, about 18 million people, or less than 6% of the U.S. population, have received at least one dose of vaccine, including about 3 million who have gotten the second shot, according to the Centers for Disease Control and Prevention. Only slightly more than half of the 41 million doses distributed to the states by the federal government have been injected into arms, by the CDC’s count.