There are a lot of times a kitten with test "positive" falsely so be careful. The kit can test negative and months later test positive (especially if he was vaccinated) and then test negative once again. it has a lot to do with thier immune system as well. You would do well to wait and have him retested at 8 to 10 months of age, possibly not gettin him vaccinated after all his initial shots are done if he is going to be an indoor kitty. Inndoor only cats do no necessarily need vaccinations and can opften get cancer or other illness from being vaccianted.