I was intrigued to come across this, which I didn't know, though others may be familiar with it. [Dysentery is a form of infectious diarrhoea, can be severe or fatal, and characteristically causes the passage of blood and mucus].

https://www.jstor.org/stable/20324148
'Epidemic bacillary dysentery... was the main cause of the Gallipoli failure. No fewer than 120,000 casualties were evacuated from the Peninsula from July to November 1915 and they were mostly due to bacillary dysentery...'
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