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
3%
9%
3%
80%
31
flagGreece
5%
22%
2%
69%
36
flagAustralia
7%
22%
1%
68%
67
flagthe Netherlands
6%
27%
3%
63%
33
flagPoland
12%
18%
8%
60%
23117
flagRepublic of Ireland
17%
17%
5%
60%
40
flagGermany
10%
25%
4%
58%
307
flagCanada
15%
23%
2%
58%
84
flagthe United Kingdom
10%
25%
4%
57%
359
flagPakistan
6%
31%
3%
56%
130
flagMalaysia
2%
36%
4%
56%
46
flagIndia
10%
29%
3%
53%
837
flagUnknown
10%
34%
2%
51%
49
flagAustria
14%
26%
10%
50%
50
flagthe United States
16%
27%
4%
48%
1086
flagGhana
3%
48%
0%
44%
27
flagSwitzerland
25%
29%
1%
42%
54
flagthe Philippines
17%
37%
4%
36%
119
flagthe United Arab Emirates
20%
34%
10%
34%
29
flagNigeria
11%
34%
16%
32%
43