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Which infectious agent is the smallest?

bacteria

virus

fungi

prion

A prion is a single protein in a misfolded form. The prion theory was developed to explain the discovery that the mysterious infectious agent causing the diseases scrapie and Creutzfeldt–Jakob disease resisted ionizing radiation. The data suggested that the infectious agent was too small to be a virus.

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Italy

2%

15%

5%

75%

40

the Netherlands

4%

22%

2%

71%

45

Greece

5%

25%

2%

67%

40

Republic of Ireland

11%

15%

5%

66%

69

Australia

11%

22%

1%

63%

88

Poland

11%

18%

8%

61%

25354

the United Kingdom

10%

24%

4%

58%

457

Pakistan

6%

30%

3%

57%

145

Canada

13%

26%

2%

57%

115

Austria

11%

25%

4%

56%

162

Germany

11%

28%

4%

54%

1001

India

10%

31%

4%

52%

1049

Malaysia

3%

40%

3%

52%

55

Unknown

10%

34%

2%

51%

49

Ghana

5%

41%

0%

51%

39

the United States

16%

28%

4%

48%

1214

Switzerland

23%

25%

3%

47%

107

Nigeria

10%

34%

13%

39%

84

the Philippines

18%

39%

3%

35%

138

the United Arab Emirates

15%

47%

7%

26%

38

Europeans brought many diseases to the Americas. Which disease did they carry back?

If you were forced to feast along the tribe of cannibals, which part of the human body should you avoid at most?

Which infectious human disease has been eradicated?

Which animals are the most threatened by a prion disease?