(I) In the former class the eggs are extruded with the faeces, and the young become fully formed within the egg, and when accidentally swallowed by their host are liberated by the solvent action of the gastric juice and complete their development.
It was also shown that animals may become infected through the faeces of a flea which has been fed on plague-infected rats.
The urodaeum serves only as a passage, the urine being mixed with the faeces in the chamber above.
(A and B from Lankester's Treatise on Zoology, part iv., C original.) of proglottides or of eggs which are disseminated along with the faeces of the final host and subsequently eaten by herbivorous or omnivorous mammals, insects, worms, molluscs or fish.
Discharges - vomited matters, sputa, urine and faeces - are possible media by which plague is spread from person to person.