" " . , 50% 70%, , "" , "" . , 70% , " ", " ", "", , , . , . , . . ? - "" . . . . " ": (. deadline - c , ). - " " . , - . , , - . . . ? - . - , , , . . , . : " In the concentration camps,typhus was allowed to flourish and prisoners were deliberately infected with the disease to test typhus vaccines." https://www.thelancet.com/pdfs/journals/lancet/PIIS0140-6736(05)67199-1.pdf . , " " ImpfKarte.