This year's flu season is no joke: On Friday, the Centers for Disease Control and Prevention announced that it had reached epidemic status. Although experts believe that the season may have peaked in most places, flu incidence is still thought to be very high. The media blitz about the flu seems to be an epidemic of its own—so I spoke to several experts to set the record straight on some of the most common flu questions.
Where in the US is the flu worst right now?
It's sort of hard to tell, since the CDC is not releasing any real time data; its stats are about a week old. Also, maps like the one below don't track the flu itself, just flu-like symptoms. Here's a look at the CDC's symptom activity map for the week that ended on January 5:
How do I even know I have the flu? How can my doctor tell?
To know for certain, you'd need to have a blood test. But most doctors won't do that, since it won't really change the treatment (rest, drink fluids). But there are some key differences between a bad cold and a flu, says CDC spokesman Curtis Allen. "You will be running a high temperature for several days, and it will keep you in bed for a week or more," he says. But the most distinctive feature of the flu is its sudden onset. "You could be feeling fine at 10 and very sick at noon."
If the flu season has peaked, should I still get a flu shot?
Yes. A typical flu season is 10 to 12 weeks long—so if it just peaked, that means there's still another five or six weeks left. The caveat: The shot takes about two weeks to kick in, so even if you got the shot today, you could still come down with the flu, says Allen. Even if you think you've already had the flu this year, you should get a shot; it's possible (though unlikely) that you could still come down with a different strain. (...)
How do they figure out what to put in those shots, anyway?
You can thank the Southern Hemisphere for this year's vaccine. During our summer, it's flu season down under. Public-health experts monitor the strains there and use that information to predict which strains will hit us down the road. This year, they did a pretty good job of figuring out which three strains to include in the vaccines; the CDC estimates that 90 percent of this year's flu cases are from one of the three strains in the vaccine. Next year, Allen hopes that the vaccine will include four strains.
That said, flu prediction is not an exact science, says Jeffrey Shaman, a flu researcher and assistant professor in the department of environmental health sciences at Columbia University's Mailman School of Public Health. "They monitor the flu, they see what's happening," he says. "People look at that and get a feel for the patterns. It's what we used to do for weather before we had sophisticated models." Shaman is trying to improve this science with a new tool that uses real-time data from Google Flu Trends, which employs users' search terms ("flu," "fever," "body aches," etc.) to paint a picture of the location and severity of the flu. (It's actually pretty accurate.) Since Google's information is constantly updating, Shaman's models are continuously learning new information about how the flu behaves—thus increasing their accuracy. Shaman says his model can offer pretty accurate predictions of flu timing and case numbers at the municipal level. He declined, however, to offer a prediction for this year.
by Kiera Butler, Mother Jones | Read more:
Photo: USACE Europe District/Flickr
Where in the US is the flu worst right now?
It's sort of hard to tell, since the CDC is not releasing any real time data; its stats are about a week old. Also, maps like the one below don't track the flu itself, just flu-like symptoms. Here's a look at the CDC's symptom activity map for the week that ended on January 5:
Map courtesy of CDC
How do I even know I have the flu? How can my doctor tell?
To know for certain, you'd need to have a blood test. But most doctors won't do that, since it won't really change the treatment (rest, drink fluids). But there are some key differences between a bad cold and a flu, says CDC spokesman Curtis Allen. "You will be running a high temperature for several days, and it will keep you in bed for a week or more," he says. But the most distinctive feature of the flu is its sudden onset. "You could be feeling fine at 10 and very sick at noon."
If the flu season has peaked, should I still get a flu shot?
Yes. A typical flu season is 10 to 12 weeks long—so if it just peaked, that means there's still another five or six weeks left. The caveat: The shot takes about two weeks to kick in, so even if you got the shot today, you could still come down with the flu, says Allen. Even if you think you've already had the flu this year, you should get a shot; it's possible (though unlikely) that you could still come down with a different strain. (...)
How do they figure out what to put in those shots, anyway?
You can thank the Southern Hemisphere for this year's vaccine. During our summer, it's flu season down under. Public-health experts monitor the strains there and use that information to predict which strains will hit us down the road. This year, they did a pretty good job of figuring out which three strains to include in the vaccines; the CDC estimates that 90 percent of this year's flu cases are from one of the three strains in the vaccine. Next year, Allen hopes that the vaccine will include four strains.
That said, flu prediction is not an exact science, says Jeffrey Shaman, a flu researcher and assistant professor in the department of environmental health sciences at Columbia University's Mailman School of Public Health. "They monitor the flu, they see what's happening," he says. "People look at that and get a feel for the patterns. It's what we used to do for weather before we had sophisticated models." Shaman is trying to improve this science with a new tool that uses real-time data from Google Flu Trends, which employs users' search terms ("flu," "fever," "body aches," etc.) to paint a picture of the location and severity of the flu. (It's actually pretty accurate.) Since Google's information is constantly updating, Shaman's models are continuously learning new information about how the flu behaves—thus increasing their accuracy. Shaman says his model can offer pretty accurate predictions of flu timing and case numbers at the municipal level. He declined, however, to offer a prediction for this year.
by Kiera Butler, Mother Jones | Read more:
Photo: USACE Europe District/Flickr