As some of you may have read a guy I work with surrendered his cat to our shelter this past weekend. She tested F.I.V. positive, but she had had 3 rounds of the F.I.V. immunization shots. I know that this will cause cats to test positive, but I'm intrested in reading more about these shots. My vet never brought these up because my cats are all tested & all stay inside. So I'm wondering if anyone here knows anything about these shots or knows where I can read more about them?