TU Dortmund University is interested in transparent communication about the incidence of infections on campus. TU Dortmund University reports weekly how many PCR pool tests were performed and how many of them were positive. Also additional positive cases on campus identified elsewhere, such as through a positive self-test or contact follow-up, are reported weekly. Until the implementation of mandatory statewide testing for students, the number of self-tests that students performed at home was also reported. Since June 7, this is no longer sufficient evidence, so the number is no longer reported.
An incidence is not calculated because it is not very meaningful for small cohorts. TU Dortmund University uses anonymized case numbers for the statistics.
If 10,000 individuals are tested regularly, one might expect about 3 to 10 cases per week based on a regional incidence of 30 to 100. However, because the individuals on campus are a small- to medium-sized cohort, case numbers are expected to fluctuate, sometimes below and sometimes above the regional average. They could be systematically above because of two factors: First, the incidence in the student age group (20 to 29 years) in the first year of the pandemic was always higher than in the general population, by an average of 50 percent. On the other hand, serial testing also captures the number of unreported cases that remain undetected when testing is otherwise carried out on an ad hoc basis.
Since June, there has been no reporting, as students have since been required to prove a negative test result through a citizen test.