. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . ins, working with Councilman, thinks that his original tentativecycle is too elaborate. He still firmly believes that the bodies areprotozoa, but that they belong among the rhizopoda and not amongthe microsporidia where he first placed them. Prowazek and others believe that the organisms of this group of diseases, aswell as of rabies, scarlet fever, trachoma, and a few others, are all minute coccus- ETIOLOGY OF VARIOLA AND COW-POX 555 like forms which have the power of producing an envelope from th
. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . ins, working with Councilman, thinks that his original tentativecycle is too elaborate. He still firmly believes that the bodies areprotozoa, but that they belong among the rhizopoda and not amongthe microsporidia where he first placed them. Prowazek and others believe that the organisms of this group of diseases, aswell as of rabies, scarlet fever, trachoma, and a few others, are all minute coccus- ETIOLOGY OF VARIOLA AND COW-POX 555 like forms which have the power of producing an envelope from the host cellsubstance, such envelope with its contained organism constituting the specificbody which others have called a protozoon. Prowazek calls the group Chla-mydozoa and says they probably stand between the bacteria and the protozoain systematic classification. From our studies on this whole group of diseaseswe have come to the conclusion that there is no close relationship between thetrachoma bodies and the intracellular bodies of rabies, smallpox and scarletfever (see pp. 415 and 561).. Fig. 195.—Epithelial cells of a rabbits cornea, containing many vaccine fixed three days after inoculation with smallpox virus, a and 3, vaccine bodies;h and c. nuclei. X 1500 diameters. In our own work on sections, which has extended irregularly over a periodof several years, we have gotten results which are somewha,t confusing, princi-pally because of the non-uniformity of the appearances of these bodies, both bydifferent methods of demonstration and by the same methods at different is no doubt that, whatever the nature of the bodies, they are easily affectedby methods used for fixing, hardening, and staining them. This accounts in partfor the varied results reported. However, in the most perfectly preparedspecimens, judged according to the appearance of the red blood cells, leuko-cytes, and tissue cells at a distance from the lesions, we have found that thev
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