Made by Minato Nakazawa, on 16 July 2009. The latest update was done on 6 April 2011 . Contact address is nminato[at]med.gunma-u.ac.jp ([at] should be replaced by "@").
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In some of these countries, around 2% of cases have developed severe illness, often with very rapid progression to life-threatening pneumonia.
Most cases of severe and fatal infections have been in adults between the ages of 30 and 50 years.
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