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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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Answers by country

Italy

2%

15%

5%

75%

40

the Netherlands

4%

22%

2%

70%

48

Republic of Ireland

11%

15%

5%

67%

70

Greece

5%

25%

2%

67%

40

Australia

11%

22%

1%

64%

90

Poland

11%

18%

8%

61%

25541

the United Kingdom

10%

23%

4%

59%

464

Pakistan

6%

30%

3%

57%

145

Canada

13%

26%

2%

57%

115

Austria

11%

25%

4%

56%

167

Germany

11%

28%

4%

54%

1038

India

10%

31%

4%

52%

1050

Malaysia

3%

40%

3%

52%

55

Unknown

10%

34%

2%

51%

49

Ghana

5%

41%

0%

51%

39

the United States

15%

28%

4%

48%

1235

Switzerland

22%

25%

3%

48%

110

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?

Which animals are the most threatened by a prion disease?