Efter en influenzavaccination kan der ses falsk positive resultater m. h. t antistoffer mod HIV- 1, hepatitis C og specielt HTLV- 1 i serum undersøgt med ELISA- metoden.
Following influenza vaccination, false-positive serology test results may be obtained by the ELISA method for antibody to human immunodeficiency virus-1 (HIV-1), hepatitis C virus and, especially, HTLV-1.