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Flu is spreading fast this year, with a severe season possible - KVOA | KVOA.com | Tucson, Arizona

Flu is spreading fast this year, with a severe season possible

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This year’s flu season is off to a fast start and early indications suggest that it may be more severe than the previous season.

Four states currently have widespread flu activity, according to the Centers for Disease Control and Prevention. Last winter there were none at this time.

And it may be spreading fast. Dr. William Schaffner, who is involved in the CDC’s flu surveillance network in Tennessee, has noticed cases of influenza picking up "dramatically" in the last week.

Even worse, it appears the dominant strain will be H3N2, which can produce more severe illness, said Schaffner, an infectious disease specialist at the Vanderbilt University Medical Center.

To get an idea of what a flu season in the U.S. will look like, scientists like Schaffner observe what happens in Australia, which experiences winter and the flu while Americans are having summer. In the summer of 2017, the flu was diagnosed in more Australians than the previous season — 168,337 versus 91,000 — with H3N2 predominant.

How effective is the 2017 flu vaccine?

Unfortunately, the flu vaccine in Australia, which is the same one available this fall and winter in the United States, was only 10 percent effective in preventing illness from H3N2.

“Typically in years when the predominant strain is H3N2, there are more hospitalizations, more severe disease and people tend to get sicker,” said Dr. Michael Ison, a professor of infectious disease and organ transplantation at Northwestern University’s Feinberg School of Medicine.

Dr. Anthony Fauci, the director of the National Institute of Allergy and Infectious Diseases, suspects the vaccine won’t work any better in the U.S.

“It is possible that we will experience low vaccine effectiveness against influenza A (H3N2) viruses and a relatively severe influenza season if they predominate,” Fauci and colleagues wrote in an article published recently in the New England Journal of Medicine.

What you need to know about the new shingles vaccine and this year's flu shot 1:55

However, while vaccinated people can still get sick, generally they get a milder and less dangerous form of the illness.

“We think of the influenza virus as attacking the throat, the bronchial tubes and the lungs,” he explained. “But it affects the whole body. It can involve the blood vessels, particularly those going to the heart and the brain. If they are inflamed they can clog up and that can produce a heart attack or a stroke.”

However imperfect the flu shots are, “current influenza vaccines remain a valuable public health tool, and it is always better to get vaccinated," Fauci and colleagues wrote in the Journal.

The CDC estimates that the flu shot prevented 40,000 deaths in the United States between the 2005-2006 and 2013-2014 seasons.

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