Figure 1. Timeline of events.

• A
  Series of events in MPP‐R and MPP‐D (boxes with solid and dashed outline, respectively) preceding the outbreak in MPP‐R. The encounter between MPP‐R and MPP‐D workers which may have initiated the outbreak in MPP‐R is shown in the gray box to the right. * quarantine in MPP‐D involved all positive cases (n = 94) as well as those among the 185 workers with negative test results who had been directly employed in meat processing. Negatively tested employees with other roles (e.g., administrative or security staff) were not quarantined.
• B
  Events in MPP‐R during the outbreak in late May. The three consecutive days during which the index case B1 worked in the early shift and thus the time period during which work‐related exposure may have occurred is highlighted in blue.
• C
  Events in MPP‐R during June. Risk‐ and evidence‐based sampling during early June was performed by health authorities, general practitioners, as well as the internal test center from MPP‐R. While we do not have exact information regarding the total number of positive cases for this time period, we have indicated a minimum incidence number above the timeline (110) based on publicly available reports from the local health authorities (https://www.kreis-guetersloh.de/aktuelles/corona/pressemitteilungen-coronavirus/). Boxes below the timeline mark positive cases from internal MPP‐R testing that were subjected to viral genotyping. Cases designated as pork processing workers were directly associated with meat processing (deboning, shearing, packaging), while internal employees denote individuals working in areas such as the convenience food section, technical operation, or occupational safety.

Data information: Saturdays, Sundays, and holidays are shown as gray numbers across all panels.