[Corona in Children: the Co-Ki Study].

Background In Germany over 80% of children and adolescents are in the ambulatory care of registered pediatricians. These have a specific perspective on the COVID-19 pandemic. Methods For this reason, this professional group initiated a central recording of case numbers, individual case descriptions and observations on infections and illnesses with SARS-CoV‑2 (www.co-ki.de). Results So far 557 pediatricians have participated. Together they care for ca. 670,000 children. They reported 9803 children who presented as suspected cases. The pediatricians themselves had a clinical suspicion of SARS-CoV‑2 infections in 3654 children. In 7707 children PCR tests were carried out using nose/throat swabs of which 198 (2.6%) were positive. In addition, 731 children were tested for SARS-CoV‑2 antibodies with detection in 82 cases (11.2%). Despite initially positive PCR tests, 47 children had a negative antibody test at least 2 weeks later. Our query as to infections of adults by children yielded only one case, which a telephone enquiry revealed as unlikely. Discussion From an outpatient pediatric perspective COVID-19 is rare. There was no convincing evidence that children are a relevant source of infection for SARS-CoV‑2 nor that they are relevantly at risk.