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
2%
2%
0%
95%
45
flagRepublic of Ireland
6%
7%
6%
79%
144
flagthe Netherlands
6%
11%
3%
78%
88
flagNorway
14%
8%
2%
73%
34
flagSwitzerland
8%
17%
2%
71%
35
flagGermany
10%
13%
6%
69%
283
flagFrance
10%
8%
10%
69%
56
flagPoland
9%
15%
6%
68%
24554
flagSweden
15%
11%
2%
68%
44
flagAustralia
6%
23%
2%
67%
43
flagAustria
2%
23%
5%
67%
34
flagMalaysia
2%
29%
0%
67%
34
flagthe United Kingdom
9%
16%
6%
65%
646
flagCanada
11%
17%
4%
65%
85
flagIndia
9%
24%
2%
60%
543
flagLithuania
5%
19%
2%
58%
36
flagUnknown
16%
16%
10%
55%
817
flagPakistan
6%
30%
6%
55%
80
flagthe United States
14%
23%
4%
54%
1126
flagthe Philippines
12%
25%
4%
54%
94

Gender

men62%
women67%
bacteria
12%
9%
virus
16%
15%
fungi
8%
7%
prion
62%
67%

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Which infectious agent is the smallest?
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