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

bacteria
virus
fungi
prion
answers
flagItaly
2%
11%
5%
77%
36
flagthe Netherlands
4%
23%
2%
69%
43
flagGreece
5%
24%
2%
67%
37
flagRepublic of Ireland
11%
16%
6%
66%
62
flagAustralia
11%
22%
1%
63%
87
flagPoland
11%
18%
8%
61%
24585
flagAustria
10%
22%
6%
59%
130
flagthe United Kingdom
10%
25%
4%
57%
424
flagPakistan
5%
30%
3%
57%
136
flagCanada
14%
25%
2%
57%
106
flagGermany
10%
27%
4%
56%
765
flagMalaysia
3%
36%
3%
55%
52
flagIndia
9%
31%
4%
51%
996
flagUnknown
10%
34%
2%
51%
49
flagSouth Africa
12%
29%
6%
51%
31
flagthe United States
16%
28%
4%
47%
1167
flagSwitzerland
26%
27%
1%
45%
84
flagthe Philippines
17%
39%
3%
36%
128
flagNigeria
10%
35%
14%
36%
76
flagthe United Arab Emirates
17%
41%
8%
29%
34