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Which infectious agent causes diseases that are the most difficult to cure?

bacteria

virus

fungus

prion

All known prion diseases affect the structure of the brain or other neural tissue and all are currently untreatable and universally fatal. This includes bovine spongiform encephalopathy (BSE, also known as "mad cow disease") in cattle and Creutzfeldt–Jakob disease (CJD) in humans.

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Answers by country

Italy

10%

26%

0%

63%

38

Pakistan

6%

23%

6%

62%

143

Greece

5%

31%

2%

60%

38

Republic of Ireland

9%

26%

2%

59%

71

Malaysia

2%

34%

6%

58%

50

Poland

8%

28%

7%

55%

24648

Australia

10%

28%

5%

54%

103

the Netherlands

8%

28%

8%

52%

46

Canada

7%

36%

6%

50%

113

Germany

7%

36%

5%

48%

995

Switzerland

6%

40%

6%

47%

114

the United States

7%

38%

6%

46%

1132

Austria

9%

39%

4%

46%

171

India

4%

42%

7%

44%

1005

the United Kingdom

5%

42%

6%

44%

435

Nigeria

1%

51%

2%

43%

80

Ghana

3%

46%

3%

43%

32

the United Arab Emirates

13%

32%

10%

37%

37

South Africa

13%

36%

10%

36%

30

the Philippines

13%

48%

5%

31%

122

How do baby birds get oxygen inside their eggs?

They have a large oxygen supply from the start

Oxygen is created during protein reduction

Oxygen comes in through pores in the shell

They don't need oxygen at all

How deep is the root system of a giant sequoia?

4 meters (13 feet)

20 meters (60 feet)

40 meters (130 feet)

80 meters (260 feet)

How many chromosomes does a mule have? (A horse has 64, a donkey has 62)

It is infertile and does not have chromosomes

Which infectious agent is the smallest?