Difficulty in nailing down the predominant strains this year led Sanofi Pasteur to delay production of its flu vaccine by a month.
Even a rise in temperature of a degree or two can can increase the number of one particular type of "flesh-eating" bacteria in ocean water, an expert told "Newsweek".
Scientists have so far struggled to find ways of killing the bacteria which cause measles and the flu in the air before they enter our bodies.
The flu is easy to give to others and some people stay contagious for more than a week.
The highly contagious virus has continued to spread.
Public health officials said the flu variant can be treated the same way as typical flu season strains.
Scientists believe men create more of a protein called amphiregulin which helps with healing.
The so-called "Spanish flu" of 1918 is thought to have killed between 50 and 100 million people around the world.
Although the flu is common, sometimes it can be life-changing.
"He joined the fire department just to give back to everybody. That's the type of heart he has."
Here's what's happening inside your body as the flu invades.
The strain to which you lost your flu virginity will always hold a special status.
Perhaps all that shirtless horse riding wasn't such a good idea after all.
Frank Holland explained that his wife decided not to take the medication after she discovered it would cost her $116.
People with the flu can have a rash, though more common symptoms include a cough, a sore throat, body aches and fatigue.
Emily was given Tamiflu to relieve her symptoms.
Holding back could prove deadly, doctors warn.