COCCIDIOSIS : SYMPTOMS 



119 



22 ounces. At the early stages of disease the birds 

 stand about in little groups and utter plaintive cries. 

 They often droop their heads, but when food or 



,-spz. 



ooc 



--:--:[ mz. 



v par. 



FIG. 27 PORTION OF THE GUT (CAECUM) OF A GROUSE INFECTED 

 WITH ElMERIA AVIUM, SHOWING THE LINING EPITHELIUM 

 RIDDLED WITH PARASITES. MANY STAGES IN THE LlFE- 

 HlSTORY OF ElMERIA AVIUM ARE SHOWN IN SECTION THEREIN 



par., Parasite; spz., sporozoite, or primary infecting germ; sch., 

 schizont, or dividing form ; mz., merozoites, or daughter forms ; 

 <J, microgametes (male elements) attached to the micro- 

 gametocyte (male mother cell) ; $ , macrogamete (female) ; 

 ooc., oocyst 



water is given them, will eat or drink greedily ; but 

 in spite of taking large quantities of food they 

 become thin and make little progress. The muscles 

 of the breast and legs particularly show wasting. 



