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==Antigenicity==
 
==Antigenicity==
*Main envelope protein: gp70
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Viral subgroups have been categorised based on the different abnormalities detected in the host cellular envelope protein gp70. This protein interacts with a cellular receptor, and can prevent already infected cells from being targeted by further viral organisms.
*3 antigenic subgroups:
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*Group A
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**is transmitted between cats
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**is monotypic: one vaccine covers all isolates
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**causes '''lymphosarcoma'''
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*Group B:
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**is recombinant with transmissible FeLV-A
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**increases the chance of '''thymic tumors'''
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*Group C:
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**is a mutant of A
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**isolates are rare, and occur as A+C mixtures
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**increases chances of '''anemia'''
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There are 3 antigenic subgroups which are defined by the gp70 regulated viral response:
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*Group A is transmitted between cats and is monotypic: one vaccine covers all isolates. Infection with this viral subgroup leads to '''lymphosarcoma'''.
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*Group B is recombinant with transmissible FeLV-A; infection with viruses of this subgroup increases the chance of developing '''thymic tumors'''.
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*Group C is a mutant of subgroup A. Isolates are rare, and occur as A+C mixtures, leading to  an increased chance of developing '''anemia'''.
    
==Diagnosis==
 
==Diagnosis==
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