With enough changing of the influenza RNA over time, the vaccine no longer provokes the “right” immune response.
In 2009 nearly all influenza cases were caused by the pandemic H1N1 virus, driving the previously dominant H3N2 underground.
Swine flu has spread through the country just like, well, influenza.
Normally, the overwhelming majority of influenza deaths are in the elderly and fragile.
Essential supplies, including blankets, are hard to come by and influenza is running through the camp.
The menus for colds, catarrh, hay fever, and asthma may be used for influenza.
It was from Mr. Tyler, and stated that he had caught the influenza, and could not come.
The question of the contagiousness of influenza is one of grave interest, and has been the subject of much controversy.
The others ought to be here directly, unless they have got the influenza too.
influenza had been on her for some days, and now pneumonia had set in.
1743, borrowed during an outbreak of the disease in Europe, from Italian influenza "influenza, epidemic," originally "visitation, influence (of the stars)," from Medieval Latin influentia (see influence). Used in Italian for diseases since at least 1504 (cf. influenza di febbre scarlattina "scarlet fever") on notion of astral or occult influence. The 1743 outbreak began in Italy. Often applied since mid-19c. to severe colds.
influenza in·flu·en·za (ĭn'flōō-ěn'zə)
An acute contagious viral infection, commonly occurring in epidemics or pandemics, and characterized by inflammation of the respiratory tract and by the sudden onset, fever, chills, muscular pain, headache, and severe prostration. Also called grippe.
A highly contagious infectious disease that is caused by any of various viruses of the family Orthomyxoviridae and is characterized by fever, respiratory symptoms, fatigue, and muscle pain. It commonly occurs in epidemics, one of which killed 20 million people between 1917 and 1919.
Our Living Language : Since ancient times, influenza has periodically swept the world. Until recently, people could not tell how this illness, which we call the flu, could spread so widely. Before people knew that organisms cause disease, they thought the stars influenced the spread of influenza. Influenza comes ultimately from the Latin word influentia, meaning "influence of the stars." Today, however, the stars are no longer blamed for the flu. Inhaling influenza viruses causes the spread of the illness.