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. 2016;57(1):E19-22.

The new pandemic influenza A/(H1N1)pdm09 virus: is it really "new"?

V Baldo  1 , C Bertoncello  1 , S Cocchio  1 , M Fonzo  1 , P Pillon  1 , A Buja  1 , T Baldovin  1
Affiliations

The new pandemic influenza A/(H1N1)pdm09 virus: is it really "new"?

V Baldo et al. J Prev Med Hyg. 2016.

Abstract

In June 2009, the World Health Organization (WHO) issued a pandemic alert concerning the spread of an influenza A (H1N1) virus that showed distinctive genetic characteristics vis-à-vis both seasonal influenza strains and vaccine strains. The main mutation occurred in the gene coding for hemagglutinin (HA). Mathematical models were developed to calculate the transmissibility of the virus; the results indicated a significant overlap with the transmissibility of previous pandemic strains and seasonal strains. The remarkable feature of A/(H1N1)pdm09, compared with seasonal strains, is its high fatality rate and its higher incidence among younger people. Data provided by the WHO on the number of deaths caused by A/(H1N1)pdm09 only include laboratory-confirmed cases. Some authors suggest that these data could underestimate the magnitude of the event, as laboratory confirmation is not obtained in all cases. It is important to bear in mind that the A/(H1N1)pdm09 virus is still circulating in the population. It is therefore essential to maintain its epidemiological and virological surveillance.

Keywords: A/(H1N1)pdm09; Influenza; Pandemic.

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Figures

Fig. 1.
Fig. 1.
Number of specimens positive for influenza by subtypes (from 19 April 2009 to 24 July 2010).
See this image and copyright information in PMC

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