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%
15%
5%
75%
40
flagthe Netherlands
4%
22%
2%
71%
45
flagRepublic of Ireland
11%
15%
5%
67%
70
flagGreece
5%
25%
2%
67%
40
flagAustralia
11%
22%
1%
63%
88
flagPoland
11%
18%
8%
61%
25360
flagthe United Kingdom
10%
24%
4%
58%
457
flagPakistan
6%
30%
3%
57%
145
flagCanada
13%
26%
2%
57%
115
flagAustria
11%
25%
4%
56%
163
flagGermany
11%
28%
4%
54%
1004
flagIndia
10%
31%
4%
52%
1049
flagMalaysia
3%
40%
3%
52%
55
flagUnknown
10%
34%
2%
51%
49
flagGhana
5%
41%
0%
51%
39
flagthe United States
16%
28%
4%
48%
1215
flagSwitzerland
23%
25%
3%
47%
107
flagNigeria
10%
34%
13%
39%
84
flagthe Philippines
18%
39%
3%
35%
138
flagthe United Arab Emirates
15%
47%
7%
26%
38