Foto: "<a href="https://www.ccnull.de/foto/three-doses-of-sars-cov-2-vaccine-against-the-european-union-flag/1034213" target="_blank">Three doses of SARS-CoV-2 vaccine against the European Union flag</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@N08/50714641456/" target="_blank">Bildquelle</a>, <a href="https://creativecommons.org/licenses/by/2.0/de/" target="_blank">CC-BY 2.0</a>