Table 2.

Comparison of Seroprevalence and Reported COVID-19 Case Rates Overall and by State

State	No. of Serum Samples	No. of Seropositive Samples	Seroprevalence (95% CI)	Reported Case Rate	Infection Discovery Ratio
Overall	12,932	747	5.8% (5.4%-6.2%)	3.3%	1.7
Alabama	179	4	2.2% (0.1%-4.4%)	3.0%	0.8
Arizona	291	16	5.5% (2.9%-8.1%)	4.4%	1.3
Arkansas	141	2	1.4% (0.0%-3.4%)	1.7%	0.8
California	2,255	115	5.1% (4.2%-6.0%)	2.4%	2.1
Colorado	127	7	5.5% (1.5%-9.5%)	2.7%	2.0
Connecticut	112	17	15.2% (8.5%-21.8%)	9.0%	1.7
Florida	2,170	75	3.4% (2.6%-4.1%)	1.8%	1.9
Georgia	487	38	7.8% (5.4%-10.2%)	3.2%	2.4
Illinois	439	38	8.7% (6.0%-11.3%)	4.7%	1.8
Indiana	152	8	5.3% (1.7%-8.8%)	3.0%	1.8
Iowa	80	2	2.5% (0.0%-5.9%)	2.7%	0.9
Kansas	84	2	2.4% (0.0%-5.6%)	1.5%	1.6
Kentucky	97	1	1.0% (0.0%-3.0%)	1.9%	0.5
Louisiana	91	15	16.5% (8.9%-24.1%)	5.5%	3.0
Maryland	360	26	7.2% (4.6%-9.9%)	3.9%	1.9
Massachusetts	112	13	11.6% (5.7%-17.5%)	8.4%	1.4
Michigan	371	31	8.4% (5.5%-11.2%)	4.3%	1.9
Minnesota	167	7	4.2% (1.2%-7.2%)	3.4%	1.2
Mississippi	59	1	1.7% (0.0%-5.0%)	3.4%	0.5
Missouri	141	7	5.0% (1.4%-8.6%)	2.6%	1.9
Nevada	145	6	4.1% (0.9%-7.4%)	2.2%	1.9
New Jersey	389	55	14.1% (10.7%-17.6%)	9.3%	1.5
New York	348	82	23.6% (19.1%-28.0%)	9.4%	2.5
North Carolina	443	16	3.6% (1.9%-5.4%)	1.5%	2.3
Ohio	337	10	3.0% (1.2%-4.8%)	1.7%	1.8
Oklahoma	125	2	1.6% (0.0%-3.8%)	1.0%	1.5
Oregon	153	6	3.9% (0.9%-7.0%)	0.9%	4.5
Pennsylvania	440	27	6.1% (3.9%-8.4%)	3.9%	1.6
South Carolina	140	8	5.7% (1.9%-9.6%)	2.4%	2.4
Tennessee	263	8	3.0% (1.0%-5.1%)	1.7%	1.8
Texas	1,300	38	2.9% (2.0%-3.8%)	2.6%	1.1
Virginia	354	26	7.3% (4.6%-10.1%)	3.2%	2.3
Washington	195	10	5.1% (2.0%-8.2%)	2.3%	2.2
Wisconsin	140	7	5.0% (1.4%-8.6%)	2.4%	2.1

Abbreviation: COVID-19, coronavirus disease 2019.