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.
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Answers by country
bacteria
virus
fungi
prion
answers
 Italy
Italy40
 the Netherlands
the Netherlands47
 Republic of Ireland
Republic of Ireland70
 Greece
Greece40
 Australia
Australia90
 Poland
Poland25531
 the United Kingdom
the United Kingdom464
 Pakistan
Pakistan145
 Canada
Canada115
 Austria
Austria167
 Germany
Germany1035
 India
India1050
 Malaysia
Malaysia55
 Unknown
Unknown49
 Ghana
Ghana39
 the United States
the United States1232
 Switzerland
Switzerland110
 Nigeria
Nigeria84
 the Philippines
the Philippines139
 the United Arab Emirates
the United Arab Emirates38