Changes

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====Antigenicity====

==== Antigenicity ====

3 subgroups of note:

 

*A and B are found in 10% of layers, causing occasional B cell leukosis

3 subgroups of note:  

 

*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

====Epidemiology====

==== Epidemiology ====

 

*All three subgroups are transferred vertically and horizontally

*All three subgroups are transferred vertically and horizontally

====Control====

==== Control ====

*Selective breeding has now controlled the virus:

 

*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]]

 

[[Category:To_Do_-_Clinical/Viruses]]

[[Category:Avian_Type_C_retrovirus]] [[Category:Avian Viruses]] [[Category:To_Do_-_Clinical/Viruses]]