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.

Answers distribution

bacteria
virus
fungi
prion
answers
flagUkraine
0%
2%
0%
97%
43
flagRepublic of Ireland
6%
6%
6%
79%
134
flagthe Netherlands
6%
11%
3%
77%
86
flagNorway
14%
8%
2%
73%
34
flagItaly
10%
10%
3%
73%
30
flagSwitzerland
9%
15%
3%
71%
32
flagGermany
10%
12%
6%
69%
266
flagAustralia
7%
23%
0%
69%
39
flagPoland
9%
15%
6%
68%
23231
flagFrance
11%
9%
11%
68%
54
flagCanada
10%
18%
3%
67%
82
flagthe United Kingdom
10%
16%
6%
65%
607
flagSweden
17%
12%
2%
65%
40
flagMalaysia
3%
31%
0%
65%
32
flagLithuania
6%
19%
0%
61%
31
flagIndia
9%
25%
2%
60%
504
flagUnknown
16%
16%
10%
55%
783
flagthe Philippines
13%
23%
4%
55%
92
flagthe United States
14%
23%
5%
54%
1079
flagPakistan
6%
30%
5%
54%
75

Gender

men63%
women67%
bacteria
12%
10%
virus
16%
15%
fungi
8%
7%
prion
63%
67%

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answers
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Which infectious agent is the smallest?
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