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

Category	Unique listings	Total observations	Vendors
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%)