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FIV May Not Be As Bad As We Think It Is

8/13/2014

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At the recent American Veterinary Medical Association Convention there was a very good lecture on FIV — Feline Immunodeficiency Virus: Does it Really Cause Disease?

The talk was given by Dr. Sue VandeWoude, Professor and Associate Dean for Research in the College of Veterinary Medicine and Biomedical Sciences at Colorado State University. Her laboratory studies FIV “in the context of an animal model for HIV/AIDS and as an agent useful for investigation of Ecology of Infectious Disease in charismatic large felid species such as pumas and bobcats.”

For some background FIV information check out this FIV article.

Between 1 and 25% of domestic cat populations are infected with one of 5 viral clades [variants of FIV].

FIV Lecture Highlights:

FIV infection may be relatively asymptomatic in cats for many years, and some studies suggest it does not result in significant morbidity [illness] for infected animals. Nondomestic felid species, including puma (P. concolor) and lions (P. leo), are infected with distinct FIV strains that are not typically associated with overt disease.

FIV infects activated T cells [a type of cell important for immune function] and after acute symptoms (lymphadenopathy [swollen lymph nodes], fever, transient weight loss) typically enters a subclinical phase that lasts for months to years. Many cats live for years in the subacute phase with minimal noticeable disease, particularly when they live in indoor situations with limited exposure to other animals [although opportunistic infections and conditions such as gingivitis, lymphoma, and neurologic symptoms may arise].

FIV-positive animals in multi-cat households may transmit infection to uninfected cohorts, but the disease is not highly contagious.

After months to years of asymptomatic infection, for reasons that are not well understood, host immunologic control of FIV replication fails, resulting in increases in plasma viremia [virus in the blood stream], decreases in CD4 T cells, and increased susceptibility to infections and opportunistic diseases.

Highly virulent strains of FIV have been described, but are rare. These isolates can result in rapid immunological decline, high rate of cancer occurrence, and death within weeks to months following infection.

Dr. VandeWoude also talked about the FIV vaccine, mentioning that it not only provides immunity to the variants of FIV included in the vaccine but also offers “reasonable” cross-protection against the types that are not. However, many veterinarians have been reluctant to recommend the vaccine because it makes immunized individuals appear to have the disease on the most commonly used types of FIV tests.

Now that it looks like FIV infection is not the threat we once thought it was, use of this vaccine seems to make even less sense except in the most extreme of circumstances.

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