Table 4.

Salivary SARS-CoV-2 IgG prevalence and infections within the pandemic year 2020 in Tübingen city.

	Saliva samples, n§	Salivary IgG positive, n*	Salivary IgG positivity rate, %*	Estimated salivary IgG prevalence (95% CI)*		PCR positive, n#(city)	PCR positive, %#(city)
All children	837	12	1.4	1.6	(0.9-2.9)	34	0.5
Preschool children	504	2	0.4	0.5	(0.1-1.7)	15	0.4
Primary school children	333	10	3.0	3.4	(1.9-6.2)	19	0.7
All adults	383	3	0.8	0.9	(0.3-2.6)	1,249	1.4
Preschool adults	308	3	1.0	1.1	(0.4-3.2)	N/A	N/A
Primary school adults	75	0	0	–	–	N/A	N/A

^§Saliva was sampled between 09 September 2020 and 02 December 2020. *SARS-CoV-2 IgG was detected by the saliva ELISA. ^#PCR confirmed SARS-CoV-2 cases represent the total cases in the city of Tübingen (not within the study cohorts) and were derived from the weekly reports for Tübingen city reported by the Gesundheitsamt Tübingen that can be obtained via https://www.kreis-tuebingen.de/17094149.html. Data for the children were provided by the Gesundheitsamt Tübingen. The cut-off date was 30 November 2020. Cases in % were either calculated for the total Tübingen population or the respective Tübingen children cohorts. N/A, Not available. Adults were accompanying parents and tutors.