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'Very active' flu season continues as a second wave could be coming | NEWS-Line for Physician Assistants

'Very active' flu season continues as a second wave could be coming


The 2019-20 flu season continues to be more active than normal, with Influenza B the leading type of virus among patients nationwide. But patient visits were down compared to the previous week in much of the country, indicating the early Influenza B wave may reach a peak and start declining in the coming weeks, according to researchers at the Biocomplexity Institute at the University of Virginia who work in a research partnership with AccuWeather.

However, those researchers expect that eventually an Influenza A wave will arrive and cause considerable infections later in the season.

The percentage of visits for influenza-like illnesses (ILI) dropped over the last week, according to the Centers for Disease Control and Prevention (CDC). Nationwide, 3.2 percent of patient visits reported through the U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet) were due to influenza-like illness (ILI).

This percentage is down from 3.5 percent last week but still above the national baseline of 2.4 percent for the fifth straight week, according to the CDC.

Last year, levels of ILI in the U.S. were at or above baseline normal for 21 straight weeks, the longest above-baseline flu season since the CDC started keeping such comparable records in 2007-08.

It’s worth noting, though, that there may be updates to the current data subsequently, considering Louisiana, which had “remarkably high influenza activity” the previous week reported no activity this week. Other states with increases in cases last week also showed surprising decreases this week.

“Often the most recent report gets backfilled over the following week, so some of the dips we currently see may be corrected upwards,” said Dr. Bryan Lewis, a professor at the University of Virginia.

Last week, more than half of the states in the nation were at the highest level in the last decade for this time of year. That number fell to 19 states this week, but all regions of the country are in the “very active” transmission phase of the season with rapid growth by the first week in January, noted a report from the University of Virginia researchers partnered with AccuWeather.

“The proportion of Influenza A is increasing but is still in the ‘slow and steady' state, so I don’t think it’s clear that A will begin surging yet,” said Dr. Lewis. “I think these coming weeks will see Influenza B slowing and peaking in the South and growing in the North and then start to slow. I suspect that A will start picking up at the end of December, as it often does.”

Influenza B still causes significant illness in those stricken; however, hospitalizations and death are less frequent than with Influenza A.

If there is a second peak to the 2019-20 flu season later this winter, it would resemble the 2018-19 double-peak season, which saw a small rise in cases early followed by a larger boost later in the season.

The 2019-20 flu season follows two straight unusually bad flu seasons. Last year, the CDC estimated there were between 36,400 and 61,200 flu-related deaths in the U.S. During the 2017-18 season, the CDC estimated there were 61,000 flu-related U.S. deaths.

Download the free AccuWeather app to see the forecast for your location. Keep checking back for updates on AccuWeather.com and stay tuned to the AccuWeather Network on DIRECTV, Frontier and Verizon Fios.

Source: AccuWeather/John Roach
Photo: AP Photo/David Goldman

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