SA I had not thought specifically of vaccine hesitancy for immigrants in Germany.
When I last visited Germany in the very early 80’s I was struck by how conformist the German people were, they did their utmost best to follow all the rules, coming from Britain (at that time) I thought that strange, as all the people I knew, did their best to not follow rules.
With regard to Asian immigrants in Germany, I expect people that have been there for decades, would try to merge into German society and follow the normal rules.
However much more recent people such as the one and a quarter million Syrians may not yet have reached full rule-taking attitudes?