Table 1.

Seroprevalence studies with a representative population larger than 0.02%, location, study date, number of samples, representation ratio, population, and symptomatic fraction ${\nu }_{\mathrm{s}}$.

Location	Study date	Samples	Population	Repr. ratio	Symptomatic fraction ${\nu }_{\mathrm{s}}$	Ref.
Heinsberg, NRW, Germany	March 30–April 6	919	41946	2.191%	20.00% (95%CI: 16.32%–25.20%)	[21]
Ada County, ID, USA	Late April	4856	481587	1.008%	7.90% (95%CI: 6.40%–9.82%)	[5]
New York City, NY, USA	May 5–Jun 5	28523	8398748	0.340%	5.76% (95%CI: 5.68%–5.84%)	[14]
Santa Clara County, CA, USA	April 2–3	3330	1781642	0.187%	1.77% (95%CI: 1.05%–3.82%)	[4]
Denmark	April 6–17	9496	5824857	0.163%	6.95% (95%CI: 5.13%–13.12%)	[8]
Geneva Canton, Switzerland	April 20–27	576	504031	0.114%	10.34% (95%CI: 7.66%–16.44%)	[22]
Netherlands	April 1–15	7361	17282163	0.043%	17.31% (95%CI: 15.14%–19.95%)	[20]
Rio Grande do Sul, Brazil	April 25–27	4188	11377239	0.037%	8.10% (95%CI: 3.72%–22.07%)	[19]
Belgium	April 14–May 13	2700	11492641	0.023%	10.21% (95%CI: 8.61%–12.18%)	[16]