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https://twitter.com/EckerleIsabella/status/1297900179593605120
2/The pre-print studies 382 children (<21y) who had close contact with an infected person-77% were infected. "Nearly 1/3 of the infected children who had an infected sibling[..] did not have any other known infected close contacts, suggesting probable child-to-child transmission" 
2/ While very few outbreaks in schools have been registered - they do occur, so the ECDC. But "if physical distancing and other measures are applied, schools are unlikely to be at higher risk than other facilities with similar densities of people."
2/ (Audio ab 5:10) Krägeloh-Mann, Präsidentin der DGKJ: von Seiten der Medizin gebe es eine "klare Positionierung": das Risiko, dass Kinder "Infektionen vorantreiben", sei "extrem gering".https://twitter.com/ADejeuville/status/1264670829226463234
"Es besteht damit die Gefahr, dass sich SARS-CoV-2 effektiv unter Kindern und Jugendlichen in Betreuungs- und Bildungseinrichtungen ausbreitet." Von einer nachfolgenden Ausbreitung in den Familien und der Bevölkerung sei auszugehen.