a. Final testing should be done at least 90 days post-exposure.
b. For client "peace of mind," a second retest can be done earlier (ie: 30 days post-exposure) at which point the majority of cats possibly incubating virus at the first test will be identified. However, for the utmost confidence in the testing results, cats should be retested at least 90 days post-exposure.
c. See recommendations for FeLV testing. No. 13.

13.Discordant results are defined as conflicting test results, usually being an ELISA positive and IFA negative result. Discordancy can occur due to testing in the early phase of infection: antigenemia without viremia (no intact virus); or a false positive ELISA due to faulty technique or cross reactive antigens. These cats should be montitored by both ELISA and IFA assays at 4-8 week intervals for at least 90 days.