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. 2021 Feb 11;12:641460. doi: 10.3389/fmicb.2021.641460

TABLE 1.

Constitution of the controls and cases groups.

	Controls				Cases

	A	B	O	Total controls	A	B	O	Total cases	Total samples
Complete study	108	52	116	276	126	48	116	290	566
Sub-study randomization	30	30	30	90	30	30	30	90	180
Tested samples	30	30	29	89	29	22	30	81	170
Actual sub study^a	28 (−2)	28 (−2)	26 (−3)	82	31 (29 + 2)	24 (22 + 2)	33 (30 + 3)	88^b	170

^aSeven controls were reclassified as cases because of anti-SARS-CoV-2 seropositivity.^bAmong cases, 75 were symptomatic and 13 were asymptomatic.