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an infective agent called parainfluenza virus

to be attacked with influenza―have an attack of influenza

influenza caused by a virus called the influenza virus

an acute disease resembling influenza

a severe case of flu

an epidemic outbreak of influenza

a group of viruses including those causing influenza

local outbreaks of flu

inoculate a person with a flu virus

Government Prepares for New Influenza Virus

a medicine for killing viruses

influenza germs

a bout of flu

Influenza Epidemic in Japan

viral infection

New influenza viruses are thought to emerge through the mutation of bird flu viruses.

a virus called {poliovirus}

infection

a pathogenic organism called {adenovirus}

any drug that destroys viruses

tending to destroy viruses

pneumonia caused by a virus

Flu is prevalent in various regions.

Some people die of influenza.

a tumor virus transmitted by leafhoppers

a viral disease of green monkeys caused by the Marburg virus

animal viruses belonging to the family Filoviridae

an animal pathogen that is a virus

a virus called the hepatitis B virus

the presence of a virus in the blood stream