Figure 1.

Epidemiological context in the country/local area and the timing of outbreaks of SARS-CoV-2 infection and serological tests in the company. There were two major outbreaks in the company (blue circles), one in April 2020 (two months preceding the first serological test) and another in December 2020 (between the second and third serological tests). There were no cases recorded in the company between the first and the second serological test. Source: VDV IS, the Lithuanian Statistics Department.