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Are The Flu Shots Ineffective?

‘Flu-pocalypse’ predicted due to ineffective flu shots.


(CBS News)

Health officials say there is a potentially rough flu season ahead. According to the Centers for Disease Control and Prevention, more than 7,000 cases of influenza have been confirmed in the U.S. so far, which is more than double the number this time last year.

Flu is currently widespread in four states, including Georgia, Oklahoma, Louisiana, and Massachusetts, the CDC reports.

What’s more, this year’s flu shot may not be up to the task. It is the same formulation used during Australia’s most recent flu season — which typically sets a pattern for what the U.S. will face, and it was only ten percent effective there.

“The way that vaccines work is that they’re a deactivated or disabled version of the virus that we present to our immune system,” Dr. Pardis Sabeti, a Harvard professor and infectious disease expert, explained on “CBS This Morning.” “Our immune system then gets to see it, to recognize it, and learn it so that if we ever get a natural virus infection, we’re ready to respond.”

However, the problem with flu is that the virus continuously changes. “It’s very diverse. Lots of different strains, and it’s changing all the time,” Sabeti said. “So by the time we pick a version of the virus to make into a vaccine and put it into production, it might take six to eight months, and in that time the virus might change.” If the vaccine isn’t a close match to the strain of the virus that’s circulating once fall and winter arrive, it won’t be as effective at stopping the illness.

Doctors to millennials: Stay home when you have the flu!

On average, past flu vaccines have been about 42 percent effective, though that number can range anywhere from 10 to 60 percent in a given year.

But Sabeti says even though the effectiveness of this year’s vaccine is unusually low, it’s still worthwhile to get a flu shot.

“Even 10 percent effective is better than nothing, and a lot of it has to do with herd immunity. The more protection for people, the better for other people,” she said. “In fact, in a year where it’s low effectiveness, it’s even more important that everybody get it so we can get as much resistance and we don’t allow the virus to thrive and grow and keep changing.”

Experts say that if you do get the flu, it will likely be less severe if you have gotten a flu shot.

The CDC estimates that the flu virus has caused between 9.2 million and 35.6 million illnesses in the U.S. each year since 2010. Those cases resulted in between 140,000 and 710,000 hospitalizations and between 12,000 and 56,000 deaths each year.

The CDC recommends everyone age six months and older should get a flu vaccine every season.

Other tips for avoiding the flu include frequent hand washing and avoiding close contact with people who are sick.