Public health for the people: participatory infectious disease surveillance in the digital age

Table 1 List of symptoms collected by Influenza-like Illness (ILI) tracking systems: Influenzanet, FluTracking, Reporta and Flu Near You

Symptom	Influenzanet^a	FluTracking	Reporta	Flu Near You
Fever	✓	✓	✓	✓
Cough	✓	✓	✓	✓
Sore throat	✓		✓	✓
Shortness of breath	✓		✓	✓
Chills/night sweats	✓			✓
Fatigue	✓			✓
Nausea/vomiting	✓		✓	✓
Diarrhea	✓		✓	✓
Body aches/Muscle pain	✓		✓	✓
Headache	✓		✓	✓
Runny or blocked nose	✓		✓
Sneezing	✓
Chest pain	✓
Loss of appetite	✓
Colored sputum/phlegm	✓
Watery/bloodshot eyes	✓
Stomach ache	✓
Irritation			✓
Joint pain			✓
Weakness			✓

^aInfluenzanet has an extensive symptom questionnaire and not all of the information collected by this questionnaire is listed in Table 1. A complete list of questions can be obtained from the “Methods” section of influenzanet.eu.

ISSN: 1742-7622