Most kinds of influenza viruses live only in birds, not people.

Look at all the thousands of years we've been trying to stamp out just one life form, the influenza viruses.

The flu, however, is caused by a much more limited number of influenza viruses.

This, in my view is the most serious concentration of influenza viruses."

Type A influenza viruses are the only ones known to have cause pandemics.

After the release of new influenza viruses, the host cell dies.

Unlike the flu shot, it is made from live, but weakened influenza viruses.

His research interests focus on respiratory pathogens, including influenza viruses.

Birds are thought to be the main animal reservoirs of influenza viruses.

Influenza viruses are almost unique in their ability to spread rapidly around the world."

Influenza viruses can also cause pandemics, such as the one that occurred in 1918 and killed at least 20 million people.

Human influenza viruses mutate enough each year to force changes in the standard vaccines.

In nature, influenza viruses circulate continuously among animals, especially birds.

In addition, reassortment is most important for pandemic influenza viruses.

This year, he said, three types of influenza viruses are in the city, but none in very large numbers.

The flu is caused by one of three types of influenza viruses.

Infectious salmon anemia appears to be most like influenza viruses.

Salk's work on influenza viruses has been associated with ethical controversy.

Influenza viruses, in contrast, cause extensive damage to these nasal cells, scientists have found.

Amantadine and rimantadine are effective only against some type A influenza viruses.

When this happens with influenza viruses, pandemics might result.

And there is no guarantee that the ever-changeable influenza viruses will not develop resistance to them.

Influenza viruses are classified as A or B, according to their surface proteins.

There have been no brand-new types of the influenza viruses and no large outbreaks.

None shows signs of mixing with genes from other human influenza viruses, which is one way new strains are thought to arise.