Shigella

Bloody diarrhoea is dysentery, and Shigella is the commonest cause.

What our notes say

Bloody diarrhoea is dysentery, and Shigella is the commonest cause. (Paediatrics main exam (MBPE 4300): 24 January 2022, Paper One, 100 MCQs, 2 short)
*Shigella sonnei* has the lowest ID50 (as few as 10–100 organisms can cause disease) — this is the correct answer whenever compared against *Salmonella typhi, Vibrio cholerae, Campylobacter jejuni* (Streptococcus Classification, S. pyogenes, Rheumatic Fever, AGN)
Caused by E. coli O157:H7 (verotoxin) or Shigella toxin → endothelial cell death in renal microvasculature → platelet thrombi (Platelet Disorders)
Topics tested: HIV and the gut, diarrhoea (infectious and non-infectious), alcoholic liver disease, hepatitis A, B and C, cirrhosis, liver tumours, cholera, shigella, gallstones and pancreatitis. (Internal Medicine CAT 1 (MBIM 6112), 2019/2020: gastroenterology and hepatology,)
a) No natural food products harbour endogenous shigella species (Internal Medicine CAT 1 (MBIM 6112), 2019/2020: gastroenterology and hepatology,)
Infective colitis (Shigella, amoeba, Campylobacter, CMV), ischaemic colitis, radiation proctitis, and a brisk upper GI bleed. (Internal Medicine 4th Year 1st Semester CAT: HIV and the gut, liver disease and )