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Eur J Epidemiol. 1994 Feb;10(1):91-4.

Sero-epidemiological survey of influenza C virus infection in Spain.

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National Influenza Reference Centre North-France, Institut Pasteur, Paris.


From an overall point of view, the epidemiological situation of influenza C virus infections in western Europe is hardly known. In some countries like Spain, no epidemiological survey has been carried out to determine whether influenza C virus does or does not circulate and cause infection in the considered geographical area. We thus decided to perform such a study. A total of 191 serum samples was collected from people (from 1.5 to 80 years old) living in Spain in October 1990. These sera were tested for the presence of antibodies to influenza C virus by hemagglutination-inhibition (HI) tests. Significant HI activity was found in 59.3 to 64.9% of the 191 tested sera and titres ranged from 20 to 320. The high prevalence of antibody as well as the highly significant titres indicate an intense circulation of influenza C virus in Spain. A significant difference was found between children/teenagers and adults.

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