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The H1N1 flu disproportionately affected children and young adults, not the older adults normally taken by the traditional flu, states the report, which appears in the May 6 issue of the New England Journal of Medicine.
H1N1 spread very much like the "regular" flu and has been common in crowded places such as schools, day-care settings, camps and hospitals.
Like the seasonal flu, symptoms can include coughing, fever and a sore throat but, unlike the seasonal flu, many people had gastrointestinal problems such as nausea, vomiting and diarrhea.
Because symptoms can be similar, H1N1 may have been mistaken for other infections which are treatable, such as malaria or Legionnaire's Disease.
The virus does respond to Tamiflu (oseltamivir) and Relenza (zanamivir), but is mostly resistant to amantadine and rimantadine.