Bird flu is caused by several types of influenza A viruses. It primarily affects wild and domestic birds, but can also infect mammals. Symptoms in humans include fever, cough, fatigue, sometimes ...

The flu (influenza) is a serious virus that causes millions of illnesses each year. Symptoms include sneezing, muscle aches, and a fever. Most cases of the flu are mild enough to treat yourself at ...

Seven years of surveillance and research revealed the complex history of the H1N1 virus that leapt from pigs to humans and sparked the global swine flu outbreak. Martha Nelson is an evolutionary ...