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==Pathogenesis==
 
==Pathogenesis==
*FeLV is the "disease of friends": transmission usually occurs through '''mutual grooming'''
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FeLV is the "disease of friends": transmission usually occurs through mutual grooming. From the oropharynx, the virus spreads to most tissues in the body to replicate, notably:
*From the oropharynx, virus spreads to most tissues in the body to replicate, notably:
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*Bone marrow
**Bone marrow
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*Thymus
**Thymus
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*Salivary glands
**Salivary glands
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*Reproductive tract
**Reproductive tract
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Most kittens but only 30% of adults become '''viremic''' for life without producing antibody. The condition progresses in various forms:
*Most kittens but only 30% of adults become '''viremic''' for life without producing antibody
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*20% of viremic cats die of tumors
**20% of viremic cats die of tumors
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*30% of viremic cats die of FeLV-associated disease
**30% of viremic cats die of FeLV-associated disease
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*80% die within three years of exposure
**80% die within three years of exposure
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30% of adults exposed become '''latently infected''' and can become viremic when immunosuppressed.
*30% of adults exposed become '''latently infected''' and can become viremic when immunosuppressed
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40% of exposed adults remain healthy and develop Ab and CD8+ T cells after clearing the virus, without becoming reinfected or silent carriers.
*40% of exposed adults remain healthy and develop Ab and CD8+ Tcells after clearing the virus, without becoming reinfected or silent carriers
      
==Clinical Signs==
 
==Clinical Signs==
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