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====Antigenicity====
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==== Antigenicity ====
3 subgroups of note:
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*A and B are found in 10% of layers, causing occasional B cell leukosis
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3 subgroups of note:  
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*A and B are found in 10% of layers, causing occasional B cell leukosis  
 
*J has been found in up to 40% of broilers causing up to 10% of deaths by myeloid tumors
 
*J has been found in up to 40% of broilers causing up to 10% of deaths by myeloid tumors
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====Epidemiology====
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==== Epidemiology ====
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*All three subgroups are transferred vertically and horizontally
 
*All three subgroups are transferred vertically and horizontally
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====Control====
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==== Control ====
*Selective breeding has now controlled the virus:
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*Selective breeding has now controlled the virus:  
 
**Hens whose eggs testing positive for antigen in albumin are removed from the flock
 
**Hens whose eggs testing positive for antigen in albumin are removed from the flock
[[Category:Avian_Type_C_retrovirus]][[Category:Avian]][[Category:Poultry]]
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[[Category:To_Do_-_Clinical/Viruses]]
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[[Category:Avian_Type_C_retrovirus]] [[Category:Avian Viruses]] [[Category:To_Do_-_Clinical/Viruses]]
Author, Donkey, Bureaucrats, Administrators
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