Among persons who reported ILI, the most common symptom besides feverishness (100%) was sore throat (97%), headache (89%) and cough (88%). Signs of lower respiratory tract infection, such as difficult or fast breathing and wheezing, were less common among person who reported ILI than those with pneumonia. The mean duration of illness among persons with ILI was seven days (range 1-90); more than half of person who reported an ILI had symptoms for seven days or more.