The outbreak occurred in a building where the commercial offices were located on the first 11 floors, and the rest was occupied by residential apartments. Of t

The outbreak occurred in a building where the commercial offices were located on the first 11 floors, and the rest was occupied by residential apartments. Of the 1,143 people tested for COVID-19 in the building, 97 were diagnosed positively and 94 of them worked on the 11th floor, for a call center with 216 employees, indicating an infection rate of 43.5%, says researchers in a study published in the CDC Medical Journal.