World Health Organization Regional Office for the Western Pacific

Pandemic (H1N1) 2009

Who is most at risk from H1N1?

Though people with underlying health conditions are considered more vulnerable to the virus, young and healthy teenagers and adults under 50-years-old have also become seriously ill and in some cases died.

Consequently young and healthy teens and adults should seek immediate medical care if they show serious symptoms of this virus.

However, people with pre-existing health conditions are considered especially vulnerable as some have become seriously ill and died from this virus.

Pre-existing health conditions evident in people who have fallen seriously ill or died from this virus include serious respiratory conditions such as asthma and chronic obstructive pulmonary disease.

Other high-risk groups include persons with chronic illness predisposing to severe influenza such as:

  • Cardiac disease
  • Diabetes mellitus
  • Chronic metabolic diseases
  • Chronic renal diseases
  • Haemoglobinopathies (genetically inherited disorders of red blood cell haemoglobin including sickle cell disease and the thalassaemias.)
  • Immunosuppressive diseases (including cancers, HIV/AIDS infection, drugs)
  • Chronic neurological conditions

The following groups of people are also at risk:

  • Pregnant women, particularly in second and third trimesters.
  • Persons with morbid obesity.
  • Indigenous peoples of any age.

How do I care for a person in a high-risk group?

Contact your doctor if you are experiencing flu symptoms.

Seek medical care early since antiviral medication, which may be prescribed by a medical practitioner, is most effective if taken in the first 48 hours of flu symptoms.



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