Kinda wild. I spent most of my childhood a couple hours drive from a malaria region and never heard of anyone getting sick locally that hadn’t travelled that way. So multiple people in Germany seems surprising.
I guess this can still happen, depends for each person. Some people have higher immunity for certain bugs.
I live in a mosquito ladden region and some mosquitoe individuals ingest blood until they can no longer fly (they die) Many mosquitoe individuals feed until full, not necessarily from only one human.
Now, some people are more resistant to some diseases than others. Sickle cell anemia heterozygote humans can live with plasmodium alright.
What surprises me is that someone around an airport in Germany (urban area) actually died of malaria. Malaria causes intervals of very high fever which lead to hospitalization and treatment.
Cases are infrequent, but not extremely unlikely. There's even a term for it, airport malaria:
https://www.eurosurveillance.org/content/10.2807/1560-7917.E...