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This could be the longest flu season in decades

The new coronavirus (COVID-19) outbreak has created a third spike in influenza-like illness (ILI) activity across the United States.

The new coronavirus (COVID-19) outbreak has created a third spike in influenza-like illness (ILI) activity across the United States, as researchers working with AccuWeather predicted, according to the Centers for Disease Control and Prevention (CDC).

"The COVID-19 outbreak unfolding in the United States may affect healthcare-seeking behavior, which, in turn, would impact [CDC flu] data," the CDC noted in its weekly update.

COVID-19 has now spread to more than 160 countries or regions with more than 240,000 confirmed cases and at least 10,000 deaths. In the U.S., there have been more than 14,500 confirmed cases - up from 3,770 just last week - and at least 175 deaths.

Visits to health care providers for ILI increased for the second straight week to 5.8 percent after it was 5.2 percent last week, according to the CDC. For comparison, the highest peak during all of last year's difficult flu season was just 5.1 percent.

This season is on track to be the longest above-baseline flu season in at least 20 years of CDC records; it's the 18th straight week flu activity is above baseline normal (2.4 percent). ILI activity has had longer stretches just twice since 1999-2000, according to CDC records, and this season's third spike is just starting to ascend. The other years were 2018-19 (20 weeks) and 2014-15 (19 weeks); this year is now tied with the flu pandemic season of 2009-10.

The CDC estimates there have been at least 38 million flu illnesses, 390,000 hospitalizations and 23,000 deaths from the flu during the 2019-20 season. Laboratory-confirmed flu-related hospitalization rates overall for the U.S. remain moderate compared to recent seasons, but rates for children 0-4 and adults 18-49 are now the highest the CDC has on record for these age groups, surpassing rates reported during the 2009-10 pandemic.

The quarantining and social-distancing efforts enacted throughout the U.S. should help reduce both ILI activity and COVID-19 transmission.

"We know with the flu that people can release viruses into the air just by breathing and talking, so it doesn't necessarily have to be coughing and sneezing," Linsey Marr, an air pollution and environmental engineering professor at Virginia Tech, told AccuWeather's Monica Danielle.

"But the reason for social distancing is because even for the [germs] floating around, they're much more concentrated when you're close to the person," Marr added. "So, if you imagine someone who is smoking and you're closer to them, you're right in that puff of smoke, but if you're farther away, the air is much more diluted."

Despite those efforts, researchers point out that the major interruptions to daily life could last for several months.

"I think if anybody thinks we'll be doing this for two weeks and then we're done ... I don't think that's going to work out. We'll go right back where we started," Madhav Marathe, a director and distinguished professor of biocomplexity, told AccuWeather's Bill Waddell. "I strongly believe that all the state governments in the U.S. should actively start building temporary medical facilities. I think it's centrally important."

Flu season typically begins in October, peaks between December and February and lasts well into March, although activity can last as late as May. Flu viruses are more stable in cold air and the low humidity allows the virus particles to remain in the air, according to Peter Palese, who was the lead author on a key flu study in 2007.