Foto: "<a href="https://www.ccnull.de/foto/coronavirus-epidemic-and-covid-19-concept-with-doctor-holding-immunoglobulin-antibody-blood-test/1016579" target="_blank">Coronavirus epidemic and Covid-19 concept with doctor holding immunoglobulin antibody blood test</a>" von <a href="https://www.ccnull.de/fotograf/marco-verch" target="_blank">Marco Verch</a> via <a href="https://www.ccnull.de" target="_blank">ccnull.de</a> - <a href="https://www.flickr.com/photos/30478819@N08/50894716261/" target="_blank">Bildquelle</a>, <a href="https://creativecommons.org/licenses/by/2.0/de/" target="_blank">CC-BY 2.0</a>