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%
4%
0%
95%
21
flagItaly
9%
9%
0%
81%
22
flagthe Netherlands
6%
12%
4%
77%
66
flagRepublic of Ireland
8%
8%
9%
74%
85
flagFrance
8%
8%
8%
74%
47
flagNorway
14%
10%
3%
71%
28
flagAustralia
3%
26%
0%
70%
30
flagGermany
9%
14%
7%
68%
209
flagPoland
9%
15%
6%
67%
17781
flagSweden
14%
14%
0%
67%
28
flagCanada
10%
19%
3%
66%
77
flagMalaysia
3%
31%
0%
65%
29
flagthe United Kingdom
9%
17%
7%
64%
510
flagLithuania
7%
14%
0%
64%
28
flagIndia
9%
25%
2%
60%
376
flagUnknown
12%
20%
6%
60%
96
flagPakistan
3%
33%
5%
56%
51
flagthe United States
14%
23%
5%
55%
967
flagthe Philippines
8%
29%
4%
53%
71
flagAustria
5%
35%
10%
50%
20

Gender

men67%
women67%
bacteria
9%
9%
virus
15%
16%
fungi
7%
6%
prion
67%
67%

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Which infectious agent is the smallest?
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