The vast majority of kittens under four months of age who test positive have not been exposed to the virus. Instead, the test is detecting the immunity (antibodies) that were passed from the mother to the kitten. These antibodies may persist until the kitten is about six months old, when the kitten should be retested. If the result remains positive, the possibility of true infection is much greater. If the kitten tests negative, there is nothing to worry about.
If a kitten is bitten by an FIV infected cat, it can develop a true infection. However, the test will usually not turn positive for many months. If a mother cat is infected with the FIV at the time she is pregnant or nursing, she can pass large quantities of the virus to her kittens. This means of transmission may result in a positive test result in just a few weeks.
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