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.
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.
You can tell the difference by the colour of your snot.
A nurse in Atlanta reaches for a vial of vaccine to prepare for an injection.
David Goldman/AP Photo
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
Part of the problem was a mismatch between the influenza strains circulating and the vaccine available. Here's how annual flu shots are formulated.
Winter bugs are impossible to escape.
Illness often strikes when you’re stressed at work, not sleeping properly, or you’ve been out partying a little too much. Here's why.
Symptoms of the flu generally develop more quickly and are more severe than the common cold.
Most adults get two to three colds per year, while the flu is less common but more severe. Here's how to stop spreading them to others.
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.
Pregnant women should get the flu shot to protect themselves, and their child for the first 6 months of life.
Seasonal influenza is a serious public health problem.
Influenza is an important cause of severe respiratory illness in Kenya especially among children below two years of age.
It can be difficult to find records from epidemics long past.
U.S. National Library of Medicine
One hundred years after a strange and devastating pandemic, researchers comb for clues in dusty libraries, church records and long- forgotten books.
More women than men were left standing after the war and pandemic.
Library of Congress
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?
Whether or not masks can protect against invading or escaping bugs depends on the type of mask and material.
Could the yearly flu shot become a thing of the past?
AP Photo/Darron Cummings, File
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.
From face-touching to virus-contaminated electronic devices, a scientist offers some tips on eradicating the flu virus from your home.
A flu patient at ProMedica Toledo Hospital in Toledo, Ohio on Jan. 8, 2018.
AP Photo/Tony Dejak
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
No one will be turned away at the emergency room because of the shutdown. But it will take the government longer to respond to public health crises.
Approximately 80 percent of all pharmaceuticals used by Americans are produced overseas.
Thanks to Hurricane Maria, some US hospitals are experiencing a saline shortage. In times of emergency, medical supply chains break down too easily.