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.
The flu shot decrease the risk of heart attacks in healthy individuals, according to research. Here, pipettes containing immune cells for testing against possible flu vaccines are seen at the National Institutes of Health in Bethesda, Md., in 2017.
(AP Photo/Carolyn Kaster)
Your risk of a heart attack increases 600 per cent within a week of catching the flu. The flu shot decreases that risk, whether you catch the flu or not.
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.
One-year-old Kilian Doherty being prepared for a chest X-ray Feb. 9, 2018 to determine if he had flu.
David Goldman/AP Photo
Regular hand washing is important not only to keep from getting the flu but also to prevent passing it to others, such as young children and seniors, who may be even more vulnerable. Here's how.
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.
Electron microscopy image of 1918 influenza virus particles near a cell.
Pandemic and bird flu viruses are more deadly than seasonal flu. Scientists may have finally discovered why.
In the event of pandemic flu, poor countries will suffer the most.
A poster from a world summit in Hong Kong on preparing for worldwide pandemics in June 2010. Despite efforts to develop plans, none is yet in place.
Vincent Yu/AP Photo
It's not a matter of if, but when, the next deadly pandemic will strike. Will the world be ready?
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.
The Nipah virus in India is just one example of a viral outbreak in 2018.
It doesn't just seem like the world is experiencing more viral infections than before – it's a reality. And the way humans live today helps viruses thrive.
Cleaning counters and keyboards can remove flu virus, which can survive well there, a study suggests.
Vaccination against the flu is the best way to stop its spread, but a recent study suggests increasing air circulation and cleaning surfaces to remove the virus from the environment.
Getting rid of this scourge is nothing to be sneezed at.
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.
The protection of the flu vaccine is minimal, and may not be worth it.
Research shows for every 100 healthy adults vaccinated against influenza, 99 get no benefit.
Health workers get ready to spray insecticide in advance of the 2016 Summer Olympics, in Rio de Janeiro, Brazil, to combat the mosquitoes that transmit the Zika virus in this Jan. 26, 2016 photo.
(AP Photo/Leo Correa, File)
Recent discoveries of ancient viruses are helping scientists understand their origins.
Despite the numerous campaigns promoting the flu vaccine to Australian health workers, uptake has been documented to range from only 16-60%.
The most effective way to improve flu vaccination rates among health workers in high-risk clinical areas and aged care facilities is to make it mandatory.
The flu shot is free for at-risk groups, and available to others for around $10-$25.
While not perfect, the seasonal flu vaccine is the best way to protect against influenza. There are a few changes to the flu vaccine and what is available this year. Here's what you need to know.
Giving pregnant mothers the flu vaccine protected their babies from getting the flu in the first six months of life.