Table 3 Summary statistics for the considered categories of listings. For each category, we included the number of unique listings, observations, and vendors. If the same vendor sold listings in different categories, we counted it as one unique vendor

PPE

355 (45.1%)

5660 (59.8%)

88 (34.9%)

Medicines

228 (28.9%)

1917 (20.3%)

106 (42.1%)

Guides on scamming

99 (12.6%)

1244 (13.1%)

40 (15.9%)

Web Domains

50 (6.3%)

189 (2.0%)

15 (6.0%)

Medical Frauds

34 (4.3%)

316 (3.3%)

23 (9.1%)

Tests

17 (2.2%)

51 (0.5%)

13 (5.2%)

Fake Medical Records

3 (0.4%)

9 (0.1%)

3 (1.2%)

Ventilators

2 (0.3%)

78 (0.8%)

2 (0.8%)

COVID-19

788 (100%)

9464 (100%)

252 (100%)