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→Antigenicity
There are 3 antigenic subgroups which are defined by the gp70 regulated viral response:
There are 3 antigenic subgroups which are defined by the gp70 regulated viral response:
*Group A is transmitted between cats and is monotypic: one vaccine covers all isolates. Infection with this viral subgroup leads to '''lymphosarcoma'''.
*Group A is transmitted between cats and is monotypic: one vaccine covers all isolates. Infection with this viral subgroup leads to '''[[Lymphoma|lymphosarcoma]]'''.
*Group B is recombinant with transmissible FeLV-A; infection with viruses of this subgroup increases the chance of developing '''thymic tumors'''.
*Group B is recombinant with transmissible FeLV-A; infection with viruses of this subgroup increases the chance of developing '''thymic tumors'''.
*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'''.
*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'''.