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Symptomatic infections less frequent with H1N1pdm than with seasonal strains

Abstract : A serosurvey conducted in a sample of first quarter pregnant women in France at week 48-49 of 2009 exhibit a seroprevalence level of 10.6%. It has been extrapolated in male and female population living in France mainland, aged 20-39 yr, that 1,712,000, 95%CI (1,112,700 - 2,311,300) people were recently infected by H1N1pdm (recently vaccinated women were excluded from analysis). From week 36 to 46-47 of 2009, 336,288, 95%CI (207,303-421,299) patients visited their general practitioners with clinical influenza in France, mainland. We then extrapolated the proportion of symptomatic H1N1pdm influenza in both males and females aged 20-39 yr who visited their GP to be 19.6%.
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Submitted on : Friday, January 22, 2021 - 12:45:52 PM
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Antoine Flahault, Xavier de Lamballerie, Thomas Hanslik, Nicolas Salez. Symptomatic infections less frequent with H1N1pdm than with seasonal strains. PLoS Currents, Public Library of Science, 2009, 1, pp.RRN1140. ⟨10.1371/currents.rrn1140⟩. ⟨hal-03118570⟩

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