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Difference between Amoebic dysentery and Bacillary dysentery

Bacillary dysentery also known as shigellosis is a bacterial disease caused by a group of bacteria called Shigella spp. Other bacterial cause of dysentery are, Vibrio parahaemolyticus, Enteroinvasive E.coli (EIEC), Enterohemrorrhagic E.coli (EHEC), Campylobacter spps, and Salmonella sps.

Amoebic dysentery (also known as amoebiasis) is caused by a invasive protozoan parasite, Entamoeba histolytica.

 

Character Amoebic dysentery Bacillary dysentery
Macroscopic
Number 6-8 motions a day Over 10 motions a day
Amount (Volume) Relatively copious Small amount
Appearance and Amount Blood mucus, semi formed

Blood mucus, mainly watery

 

Odour Offensive (fishy odour) Odourless
Colour Dark red (altered blood) Bright red (fresh blood)
Reaction Acidic Alkaline
Consistency Not adherent to the container Adherent to the container
Microscopic
RBCs In clumps Discrete, sometimes in clumps due to rouleaux formation
Pus Cells Few Numerous
Macrophages Few Numerous, many of them contain RBCs hence may be mistaken for E. histolytica
Eosinophils Present Scarce
Charcot-Leyden (C-L) crystals* Present Absent
Pyknotic bodies** Present Absent
Ghost Cells*** Absent Present
Parasites Seen Trophozoites of E. histolytica Absent
Bacteria Seen Many motile bacteria Scanty, nonmotile  (Shigella is non motile bacteria)
Culture
Growth on MacConkey Agar Various intestinal flora may grow Pure growth of Shigella spp. may be seen

 Further notes: 

Charcot Leyden Crystals