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%
39
flagItaly
8%
13%
0%
78%
23
flagthe Netherlands
7%
11%
4%
77%
70
flagRepublic of Ireland
7%
10%
8%
73%
89
flagFrance
8%
10%
8%
73%
49
flagNorway
16%
10%
3%
70%
30
flagAustralia
3%
26%
0%
70%
30
flagGermany
8%
13%
7%
69%
230
flagPoland
9%
15%
6%
68%
18878
flagCanada
10%
19%
3%
66%
78
flagSweden
13%
13%
3%
66%
30
flagthe United Kingdom
9%
17%
7%
65%
546
flagMalaysia
3%
31%
0%
65%
29
flagLithuania
6%
17%
0%
62%
29
flagIndia
8%
25%
1%
61%
403
flagUnknown
11%
17%
9%
61%
139
flagPakistan
4%
30%
4%
58%
62
flagthe United States
14%
23%
5%
54%
1003
flagthe Philippines
8%
28%
4%
54%
73
flagthe United Arab Emirates
12%
25%
8%
54%
24

Gender

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

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Which infectious agent is the smallest?
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