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Table 1 The list of symptoms used in the symptoms questionnaire.

From: Internet-based surveillance of Influenza-like-illness in the UK during the 2009 H1N1 influenza pandemic

1. Blocked/runny nose
2. Cough
3. Sore throat
4. Headache
5. Muscle pain and/or joint pain
6. Chest pain
7. Stomach ache
8. Diarrhoea
9. Nausea
10. Chills
11. Weakness
12. Eye irritation
13. Fever
14. No symptoms
  1. Participants were asked to select any symptoms that applied to them.