Bulletin of the World Health Organization

The challenges of global case reporting during pandemic A(H1N1) 2009

Stephanie Williams, Julia Fitzner, Angela Merianos, Anthony Mounts & for the Case-based Surveillance Evaluation Group

Volume 92, Number 1, January 2014, 60-67

Table 2. Number and proportion of earlier cases of A(H1N1) 2009 pandemic influenza in which influenza symptoms were reported, all regions, 2009

Symptom No. (%) of earlier casesa (n = 3710)
Completeb Symptom
Fever 2791 (75) 1905 (68)
Cough 2764 (75) 1703 (62)
Sore throat 2075 (56) 1041 (41)
Coryza 2515 (68) 841 (33)
Headache 2501 (67) 791 (32)
Myalgia 2462 (66) 693 (28)
Productive cough 1878 (51) 374 (20)
Shortness of breath 2489 (67) 223 (9)
Diarrhoea 2435 (66) 165 (7)

a Defined as the first 110 cases by date of symptom onset.

b Indicates that the symptom data field was filled (i.e not blank).