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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

Republic of Ireland

11%

15%

5%

67%

70

Greece

5%

25%

2%

67%

40

Australia

11%

22%

1%

63%

88

Poland

11%

18%

8%

61%

25420

the United Kingdom

10%

24%

4%

58%

457

Pakistan

6%

30%

3%

57%

145

Canada

13%

26%

2%

57%

115

Austria

11%

26%

4%

56%

164

Germany

11%

28%

4%

54%

1015

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%

5%

48%

1220

Switzerland

23%

25%

3%

48%

108

Nigeria

10%

34%

13%

39%

84

the Philippines

17%

40%

3%

35%

139

the United Arab Emirates

15%

47%

7%

26%

38

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

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Which infectious human disease has been eradicated?

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