New challenges for the diagnosis of feline immunodeficiency virus infection

Area of Science:

• Veterinary Immunology
• Virology
• Diagnostic Medicine

Background:

• Whole-virus vaccines for feline immunodeficiency virus (FIV) induce antibody responses.
• These vaccine-induced antibodies are serologically indistinguishable from antibodies produced during natural FIV infection.
• This creates a diagnostic challenge for veterinarians seeking to determine a cat's true infection status.

Purpose of the Study:

• To highlight the diagnostic dilemma caused by whole-virus FIV vaccination.
• To emphasize the urgent need for diagnostic tests that can differentiate infected from vaccinated animals (DIVA).

Main Methods:

• The study is a review of the current diagnostic landscape for FIV.
• It analyzes the immunological response to whole-virus FIV vaccines.
• It identifies the limitations of existing diagnostic assays in the context of vaccination.

Main Results:

• Antibodies produced after vaccination with whole-virus FIV vaccines are persistent and indistinguishable from infection-induced antibodies.
• Current diagnostic tests for FIV cannot reliably differentiate between vaccinated and naturally infected cats.
• There is a lack of commercially available rapid diagnostic tests that meet DIVA standards.

Conclusions:

• The use of whole-virus FIV vaccines poses a significant diagnostic challenge.
• Development of novel diagnostic tests is crucial for accurate FIV diagnosis in vaccinated cat populations.
• Meeting DIVA standards is essential for effective FIV control and management strategies.