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Positive correlation between swine-origin influenza A (H1N1) virus infection and severe respiratory disease
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  1. N Kakkar
  1. Correspondence to N Kakkar, University of Northumbria at Newcastle, Newcastle upon Tyne, UK; n.kakkar{at}northumbria.ac.uk

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Two studies were carried out in Mexico in March and April 2009 in the wake of a wave of infections with swine-origin influenza A (H1N1) virus (S-OIV).

The first study focused on the clinical and epidemiological features of the first 18 cases of S-OIV infection confirmed by laboratory analysis of nasopharyngeal swabs and bronchial aspirates subjected to RT-PCR that progressed within 5–7 days to pneumonia. The patients were admitted to a tertiary care centre for respiratory diseases in Mexico in the period between 24 March and 24 April 2009. Their median age was 38 years, with 10 of the 18 patients being previously healthy …

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