The finding came about while scientists were looking into the virulence of the H1N1 influenza strain. Back in 2009 a pandemic associated with this virus killed over 250,000 people worldwide. Symptoms of such a viral disease include fever and extreme ...

Several outbreaks of severe bird flu in Europe and Asia have been reported in recent days to the World Organisation for Animal Health (OIE), in a sign the virus is spreading quickly again.

Just 10 viral particles of the H5N1 bird flu that caused hundreds of influenza outbreaks in U.S. dairy cattle can cause infection in cows, a new study shows. The research also hints at why the outbreaks have confounded scientists,

Influenza, commonly known as the flu, often causes fever, body aches, and a sore throat. These symptoms usually resolve in a week. When you are sick with the flu, it's due to a specific strain of the virus. There are hundreds of these strains. Flu viruses ...

Flu symptoms often arrive together. Fever is believed to make the lungs less hospitable to viral multiplication. Coughing and sneezing help clear excess mucus from the airways. The heavy fatigue and body aches are common when the immune system is working ...