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====Bovine Immunodeficiency Virus (BIV)====
 
====Bovine Immunodeficiency Virus (BIV)====
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*Lentivirus (non-oncogenic)
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*Causes a persistent viral infection and lymphocytosis
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*Immunocompromised cattle may develop secondary infections
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*The tranmission is not well known, but the following possibilities are being researched:
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**Through milk
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**Through infected semen (e.g.artificial insemination)
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**Placental transfer
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*Diagnosis:
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**Western Blot
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**PCR
    
===Toxic Causes===
 
===Toxic Causes===
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