·
Shigella, enterohemorrhagic Escherichia
coli, Giardia lamblia, or Entamoeba, as few as 10–100
·
Salmonella: 103–106
·
Vibrio cholera: 105–108
·
ETEC, EIEC, and EAggEC: 106 to 1010
·
Cryptosporidium: 50%
infectious dose: ~132 oocysts in nonimmune individuals
·
B. anthracis,
While an LD50 of 10,000 spores is a generally accepted
number it has also been suggested that as few as one to three spores may
be adequate to cause disease in some settings.
·
F.turarensis: as few as 10 organisms causing infection
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