NEW YORK (AP) - February is usually the peak of flu season, with doctors' offices and hospitals packed with suffering patients. But not this year.
Flu has virtually disappeared from the U.S., with reports coming in at far lower levels than anything seen in decades.
Experts said measures put in place to fend off the coronavirus - mask wearing, social distancing and virtual schooling - were a big factor in preventing a "twindemic" of flu and COVID-19. A push to get more people vaccinated against the flu probably helped, too, as did fewer people traveling, they said.
Another possible explanation: The coronavirus has essentially muscled aside flu and other bugs that are more common in the fall and winter. Scientists don't fully understand the mechanism behind that, but it would be consistent with patterns seen when certain flu strains predominate over others, said Dr. Arnold Monto, a flu expert at the University of Michigan.
Nationally, "this is the lowest flu season we've had on record," according to a surveillance system that is about 25 years old, said Lynnette Brammer, of the U.S. Centers for Disease Control and Prevention.
Hospitals said the usual steady stream of flu-stricken patients never materialized.
At Maine Medical Center in Portland, the state's largest hospital, "I have seen zero documented flu cases this winter," said Dr. Nate Mick, the head of the emergency department.
The same goes for Oregon's capital city, where the outpatient respiratory clinics affiliated with Salem Hospital have not seen any confirmed flu cases.
"It's beautiful," the health system's Dr. Michelle Rasmussen said.
The numbers are astonishing considering flu has long been the nation's biggest infectious disease threat. In recent years, it has been blamed for 600,000-800,000 annual hospitalizations and 50,000-60,000 deaths.
Across the globe, flu activity has been at very low levels in China, Europe and elsewhere in the Northern Hemisphere. And that follows reports of little flu in South Africa, Australia and other countries during the Southern Hemisphere's winter months of May through August.
The story, of course, has been different with coronavirus, which has killed more than 500,000 people in the United States. COVID-19 cases and deaths reached new heights in December and January, before beginning a recent decline.