Californians in June 2015 protest a bill that did away with personal belief exemptions for vaccinating children before they enter school.
Rich Pedroncelli/AP Photo
Vaccination rates for children in some parts of California are down, despite a law that narrowed exemptions. Here's a look at why people refuse to listen to evidence when it comes to the flu vaccine.
The flu virus changes over time – which is why you need a different flu shot each year.
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Important research questions can almost always be answered better with a combination of methods – where both quantitive and qualitative data play a role.
Both make you sneeze and give you a runny nose.
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The flu shot is most effective if you receive it by the end of October. With 80,000 deaths from flu during last year's flu season, a doctor explains why you should act now.
An Atlanta hospital set up a mobile ER to deal with the large number of flu cases.
AP Photo/David Goldman
Many people think green snot means you are really sick, or that you need antibiotics. Not true. Green snot is actually a sign that our immune system is working and that we are getting better.
There is no live virus in a flu vaccine. So you can’t catch the flu.
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With many men 'missing' from the population in the aftermath of the 1918 flu, women stepped into public roles that hadn't previously been open to them.
Face masks are a common sight in Asia. Why?
David Chang/AAP
Flu virus mutates so quickly that one year's vaccine won't work on the next year's common strains. But rational design – a new way to create vaccines – might pave the way for more lasting solutions.
Once a respiratory virus like influenza has entered your home or workplace, it is wise to treat the space like a hospital and practice infection prevention and control.
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Anyone who's had the flu can attest that it makes them feel horrible. But why? What is going on inside the body that brings such pain and malaise? An immunologist explains.
A CDC scientist measures the amount of H7N9 avian flu virus grown in a lab.
James Gathany/CDC/Handout via REUTERS
Science has come a long way in the 100 years since the worst flu pandemic in history. But that doesn't mean that the country is ready for another health disaster.
Donnie Cardenas, on bed, waits with his roommate Torrey Jewett at Palomar Medical Center in Escondido, Calif., Jan. 10, 2018. Cardenas had the flu.
AP Photo/Greg Bull
The flu is not only making millions of people sick this year. It's causing fear and, along with it, a lot of confusion. Should you get a flu shot? Should you see the doctor? An expert advises.
The sun casts a shadow over the Capitol on Friday, Jan. 19.
AP Photo/Jacquelyn Martin