Table 1.

Ratio of positive labels.

Symptom	Ratio of number of positive tweets to the number of each symptom’s tweets (N=320 tweets)	Ratio of number of positive tweets to the total number of all symptoms’ tweets (N=2560 tweets)
Cold, n (%)	220 (0.6875)	355 (0.1387)
Cough, n (%)	295 (0.9219)	306 (0.1195)
Diarrhea, n (%)	230 (0.7188)	246 (0.0961)
Fever, n (%)	220 (0.6875)	438 (0.1711)
Hay fever, n (%)	208 (0.6500)	209 (0.0816)
Headache, n (%)	260 (0.8125)	328 (0.1281)
Flu, n (%)	128 (0.4000)	130 (0.0508)
Runny nose, n (%)	257 (0.8031)	499 (0.1949)