The Rh blood group system was discovered by Karl Landsteiner and Alexander S. Wiener. With whose blood were they experimenting?

Karl Landsteiner

Karl Landsteiner's sick daughter

Prisoners of Auschwitz

Rhesus Macaque

"Rh" stands for "Rhesus". Due to its relatively easy upkeep in captivity and anatomical closeness to humans, rhesuses have been used extensively in medical research.

Kasia

Mate Marschalko

anatomyanimalsbloodhuman anatomymacaquesmedicinemonkeysnature

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Answers by country

the Netherlands

12%

19%

67%

Pakistan

11%

13%

10%

63%

Germany

21%

14%

57%

168

Greece

21%

13%

56%

Italy

14%

20%

54%

Nigeria

22%

20%

50%

India

15%

22%

11%

47%

498

Poland

26%

16%

46%

23141

Norway

25%

45%

Unknown

12%

16%

28%

44%

South Africa

10%

28%

17%

42%

Australia

10%

27%

18%

40%

101

the United Kingdom

27%

24%

37%

355

Republic of Ireland

46%

37%

Ghana

25%

33%

Canada

10%

26%

32%

the United States

30%

27%

30%

947

Malaysia

12%

37%

18%

28%

the Philippines

14%

39%

25%

20%

the United Arab Emirates

25%

20%

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