different between infectiously vs zymotically

English

infectious +? -ly

infectiously (comparative more infectiously, superlative most infectiously)

zymotic +? -ally

zymotically (not comparable)

(pathology, obsolete) In a zymotic manner, infectiously.
- 1851, Henry Mayhew, London Labour and the London Poor, London: G. Newbold, Volume 2, p. 385,^[1]
  Whether this mass of filth [wet house-refuse] be, zymotically, the cause of cholera, or whether it be (as cannot be questioned) a means of agricultural fertility, and therefore of national wealth, it must be removed.

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