Which infectious agent causes diseases that are the most difficult to cure?

bacteria
virus
fungus
prion
All known prion diseases affect the structure of the brain or other neural tissue and all are currently untreatable and universally fatal. This includes bovine spongiform encephalopathy (BSE, also known as "mad cow disease") in cattle and Creutzfeldt–Jakob disease (CJD) in humans.
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reach: rather globalbiologydiseasesmedicinemicrobiologynatureprions
bacteria
virus
fungus
prion
answers
flagUkraine
0%
16%
8%
76%
50
flagRepublic of Ireland
5%
16%
4%
72%
146
flagAustria
7%
21%
0%
70%
41
flagGermany
4%
20%
5%
68%
277
flagMalaysia
0%
27%
5%
67%
37
flagFrance
5%
22%
5%
66%
57
flagPoland
6%
22%
5%
64%
25978
flagItaly
4%
24%
8%
62%
45
flagIndia
3%
27%
6%
60%
643
flagPakistan
5%
23%
9%
60%
88
flagCanada
5%
31%
3%
59%
106
flagLithuania
2%
24%
8%
59%
37
flagthe United Kingdom
5%
29%
6%
58%
707
flagthe Netherlands
6%
25%
7%
58%
77
flagNorway
10%
22%
10%
57%
49
flagAustralia
10%
21%
8%
56%
46
flagUnknown
7%
31%
6%
54%
782
flagthe United States
6%
33%
5%
53%
1096
flagSweden
5%
42%
0%
51%
35
flagthe Philippines
12%
31%
5%
49%
105