Glad to help Digvul. Personally I think the link with the water supply relates to the need for cleanliness and good hygiene in the treatment of these outbreaks as well as the need for a lot of liquid being given to the patients.
Cholera doesn't seem to make an appearance, although there must have been one or two cases. The last significant outbreak in the NE had been in 1853 when it was rampant.
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