CHLAMYDOZOA 



193 



VACCINE 



Cornea cells showing developmental stages of Guaraieri bodies, Cytoryctes vac- 

 cinice. (After Tyzzer.) 



-ru. 



SCARLET FEVER 



Epithelial cells of skin showing various stages in development of Mallory bodies, 

 Cydasterion scarlatina. Radiate form shown in middle figure. (After Mallory.) 



TRACHOMA 



Epithelial cell of conjunctiva showing Prowazek bodies. (After Halberstaedter.) 



RABIES OR HYDROPHOBIA 



Nerve cells of Ammon's horn of cerebrum showing Negri bodies, Neuroryctes 

 hydrophobia;. (After Maresch.) 



FIG. 59. Various types of Chlamydozoa. Note that in each case the parasite- 

 like bodies are enclosed in a ground substance supposed to be extruded by the 

 nucleus. 



