We don't know the number of asymptomatic cases.” First discovered in 1955, the virus is transmitted from person to person by a small insect called the biting midge ( Culicoides paraensis), which ...

The hepatitis B virus (HBV) affects the liver and can cause acute or chronic illness. The virus’s life cycle involves entering liver cells and producing new virus cells to trigger infections in other ...

The Chikungunya virus is spread by infected mosquitoes and causes symptoms like fever and severe joint pain. There is no specific medicine to treat the virus, and the best way to prevent it is by ...

It's sick season, and that usually brings to mind coughing, sneezing and running a fever brought on by respiratory viruses. But this time of year, another virus typically increases in spread, and ...

Researchers in China have discovered a new tick-borne illness, Wetland virus. Research shows it has the potential to invade the brain. Right now, China is the only country with cases. That’s the main ...

Influenza experts are acknowledging that they were almost completely surprised by the way the current swine flu outbreak unfolded, so much so it is forcing the world to rethink what a pandemic is and ...