- Protection against FIV challenge infection by genetic vaccination using minimalistic DNA constructs for FIV env gene and feline IL-12 expression. Boretti, F.S., Leutenegger, C.M., Mislin, C., Hofmann-Lehmann, R., König, S., Schroff, M., Junghans, C., Fehr, D., Huettner, S.W., Habel, A., Flynn, J.N., Aubert, A., Pedersen, N.C., Wittig, B., Lutz, H. AIDS (2000)