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
flagthe Netherlands
8%
10%
4%
77%
75
flagRepublic of Ireland
8%
9%
9%
73%
99
flagNorway
14%
8%
2%
73%
34
flagItaly
10%
10%
3%
71%
28
flagFrance
11%
9%
9%
69%
52
flagGermany
10%
13%
7%
68%
248
flagPoland
9%
15%
6%
67%
21822
flagCanada
10%
18%
3%
67%
79
flagAustralia
8%
24%
0%
67%
37
flagthe United Kingdom
9%
17%
7%
65%
579
flagMalaysia
3%
31%
0%
65%
29
flagSweden
17%
11%
2%
64%
34
flagLithuania
6%
19%
0%
61%
31
flagIndia
9%
25%
2%
60%
433
flagPakistan
5%
28%
5%
57%
69
flagthe United Arab Emirates
12%
24%
8%
56%
25
flagUnknown
15%
16%
11%
55%
697
flagthe Philippines
8%
28%
3%
55%
78
flagthe United States
14%
23%
5%
54%
1035

Gender

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

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Which infectious agent is the smallest?
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