282 



PLASMODIUM, HAEMOPROTEUS AND LEUCOCYTOZCXDN 



Location : The ganietocytes are in 

 the white blood cells. 



Geographic Distribution : Worldwide. 



Prevalence: This species is fairly 

 common in wild doves. Hanson el al. 

 (1957), for example, found it in 1.2'/c of 

 392 immature and 6. 5% of 72 adult mourn- 

 ing doves {Zenaidura macroiira) in Illinois. 



Morphology : Levine (1954) redes- 

 cribed this species. The macrogametes 

 are rounded or elliptical, 8 to 15 by 7 to 

 11 fi with a mean of 12 by 9 p.; they stain 

 dark blue with Giemsa's stain and have a 

 compact, reddish nucleus. The micro- 

 gametocytes are often distorted or rup- 

 tured by the smearing process, but if not 

 badly damaged measure 8 to 15 by 5 to 

 11 (1 with a mean of 11 by 8 (i . They stain 

 pale blue with Giemsa's stain and have a 

 very diffuse, pale pink nucleus. Host 

 cell cytoplasm is rarely seen surrounding 

 the microgametocytes and was found in 

 only 26% of the cells parasitized by macro- 

 gametes. When present, it forms a nar- 

 row border around part of all of the para- 

 site's periphery. The host cell nucleus 

 forms a dark-staining band along about 

 1/3 of the periphery of the parasite. 



Young gametocytes were seen only in 

 lymphocytes or, in one case, in a mono- 

 cyte. 



Life Cycle : Unknown. 



Pathogenesis : Unknown. There were 

 no signs of illness in the infected mourning 

 doves seen by Levine (1954), even though 

 4 of them were nestlings and 1 was only 

 14 days old. 



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