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For each of the last two years, Thanksgiving helped usher in some very unwelcome guests: Devastating waves of COVID-19.

No one thinks this year will be anything like the last two dark pandemic winters, at least when it comes to COVID-19. But the country is now dealing with a different kind of threat — an unpredictable confluence of old and new respiratory pathogens.

"We're facing an onslaught of three viruses — COVID, RSV and influenza. All simultaneously," says Dr. 

, an infectious disease specialist at Vanderbilt University. "We're calling this a tripledemic."

early this year, infecting babies and young children who had little or no immunity to that virus, which wasn't circulating all that much over the past two years, in part, because of COVID-19 precautions.

flooding pediatric emergency rooms and intensive care units

 across the country. Some parents are being forced to wait more than eight hours in emergency rooms for treatment for their very sick kids.

"Intensive care units are at or above capacity in every children's hospital in the United States right now," says 

, president of the Children's Hospital Association. "It's very, very scary for parents."

At the same time, an unusually early and severe 

 is surging, dominated by the H3N2 strain, which often strikes kids and older people especially hard.

"Influenza has hit the southeastern United States. It's moved into the Southwest. It's going up the East Coast and into the Midwest with some ferocity," Schaffner says.

From coast to coast, hospitalizations for the flu are at the highest level for this time of year in a decade, 

according to the Centers for Disease Control and Prevention

"Flu activity is high right now and continuing to increase," says 

, an epidemiologist in the CDC's influenza division. "The good news is, the vaccines this year are well

matched to the viruses that are currently circulating, and there is still time to get vaccinated."

"These holiday celebrations with all their travel and their close contact usually function as virus accelerators," Schaffner says. "We're spending a lot of time with each other. We're laughing and breathing deeply. And that's an ideal environment for these respiratory viruses to spread to others."

 is still sickening tens of thousands and killing hundreds of people every day. And new, even more contagious omicron

that are especially adept at infecting people — even if they've been vaccinated or previously infected — 

"There's a lot of moving parts here," says 

, who's been tracking the pandemic at the PolicyLab at the Children's Hospital of Philadelphia

"What is this all going to mean for COVID? Are we going to see a January/February resurgence of COVID that's going to be fairly significant? That may yet be coming."

Many infectious disease specialists say the immunity people have from vaccinations and infections should keep any new surge of COVID-19 infections from causing a big increase in hospitalizations and deaths.

"I'm hopeful, given where we are with COVID, that we're not looking at something like last winter. But at the end of the day, Mother Nature gets the final word on these things," Dr. 

, the White House COVID-19 Coordinator, told NPR.

"We're in new territory here" with three viruses all circulating at high levels simutaneously, he says.

"I think it's a really worrisome situation looking to the weeks coming ahead," says 

, an epidemiologist who runs the Pandemic Center at Brown University.

an exhausted nation has abandoned many of the precautions people were taking to protect themselves and others. Flu vaccination rates are down by about 10% to 15% from previous years. Only about 11% of those eligible for the new bivalent omicron boosters have gotten boosted.

"We can't just resign ourselves to assuming that it's going to happen no matter what," she says. "We can very much take action to prevent a rise in hospitalizations and deaths."

Nuzzo and others experts say Americans can get vaccinated and boosted, especially if they are at high risk because of their age or other health problems. 

People should consider Zooming for Thanksgiving if they're sick, testing for COVID-19 before gatherings (especially those involving older friends and relatives and other vulnerable people), and even consider putting that mask back on as much as possible.

"If you're not eating or drinking it's probably a smart idea to protect the immunocompromised, the infants, as well as the older individuals in the household," says Dr. 

, an infectious disease specialist at the Northwestern University Feinberg School of Medicine.

There are hints that RSV may already be peaking, and the flu could also peak early, before any new COVID-19 surge emerges. That would help relieve at least some of the pressure on hospitals.

There's even a theoretical possibility that the flu and RSV could blunt any new COVID-19 surge in the same way the coronavirus crowded out those viruses the last two years. One possibility is a phenomenon known as "

," which involves the presence of one virus reducing the risk of catching another.

 "COVID could be outcompeted, which is potentially good news," Rubin says.  

Health

Rob Stein

Author

As the holiday approaches, infectious disease specialists are bracing for the possibility that big family get-togethers and travel will propel the spread of RSV, flu and COVID-19.

Experts are concerned Thanksgiving gatherings could accelerate a 'tripledemic'

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