Excerpt from The British Journal of Dermatology, Vol. 25: January-December, 1913
The sporozoite increases in size, but not to the dimensions met with in the previous case. Having reached a certain size, it divides into two, and again into four; after the primary division the karvosome disappears. These four masses, by a process of further subdivision, form a ring and migrate to the periphery of the body, then a picture is given, as if the ring had stones mounted in it the whole way round. By this time the host-cell is almost completely degenerated, and one might imagine that the parasite had become extra-cellular, while it only does so when the host-cell is no more. In the centre and around the ring other deeply stained bodies appear, until a picture of a perfect spore. Cyst is given. This is doubtless the trueas'exual stage, and the two stages just described represent the schizogony.
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