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The 2009 H1N1 influenza (swine flu) outbreak was first observed in Mexico in early 2009. In June 2009, the WHO declared the outbreak to be a pandemic.

subtype of influenza A - most common cause of flu in humans.
2009 pandemic was caused by a new strain of the H1N1 virus.

''particularly at risk''
    patients with chronic illnesses and those on immunosuppressants
    pregnant women
    young children under 5 years old

''Features'' - typical of flu
    fever greater than 38ºC
    myalgia
    lethargy
    headache
    rhinitis
    sore throat
    cough
    diarrhoea and vomiting

minority go on to develop ARDS which may require ventilatory support.

''Treatment''
//Oseltamivir (Tamiflu)//
    oral medication
    a neuraminidase inhibitor which prevents new viral particles from being released by infected cells
  common side-effects include nausea, vomiting, diarrhoea and headaches
//Zanamivir (Relenza)//
    inhaled medication or IV if acutely unwell
    also a neuraminidase inhibitor
    may induce bronchospasm in asthmatics