And scientists are reporting this week on what they call the "indirect costs" of a virus-resistance gene in Cucurbita.

VOA: special.2009.10.27

A recent report in the journal Retrovirology found that xenotropic murine leukemia virus-related virus is not the cause of chronic fatigue syndrome.

VOA: special.2011.01.18

The new study shows that happiness spreads through social networks like an emotional virus - a virus people would be happy to catch.

VOA: special.2009.01.21

One was a virus expert. Karl Johnson had identified and photographed the Ebola virus just days earlier.

VOA: special.2009.02.23

The World Health Organization will not declare an influenza pandemic unless a virus becomes widespread in at least two areas of the world.

VOA: special.2009.05.06

Swine flu is a respiratory sickness caused by an influenza virus that mainly infects pigs.

VOA: special.2009.04.29

Phase four means that a virus has gained the ability to cause community-level outbreaks.

VOA: special.2009.05.06

The current spread of a swine influenza virus has added to these concerns.

VOA: special.2009.07.14

A virus turns much of the human population into vampires.

VOA: special.2010.01.20

The hepatitis A virus causes high body temperature,pain and weakness.

VOA: special.2010.11.16

A virus causes yellow fever.

VOA: special.2009.05.26

Hundreds of thousands of people used to get polio, a virus that spreads as easily as the common cold.

VOA: standard.2010.08.02

Health officials in Mexico and the United States were puzzled by a virus that combined elements of swine, avian and human influenza.

VOA: standard.2009.12.25

"It is quite possible with an influenza virus, a pandemic influenza virus that it gets worse over time.

VOA: standard.2009.04.30