03009naa a2200433 a 450000100080000000500110000800800410001902400520006010000220011224501190013426000090025350000630026252017750032565000220210065000160212265000220213865000110216065000160217165000110218765300160219865300150221465300200222965300190224965300220226865300200229065300190231065300120232970000140234170000200235570000190237570000130239470000200240770000170242770000180244470000200246270000170248270000210249977300550252021561792023-09-04       2023    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1186/s12985-023-02158-02DOI1 aFONSECA, F. M. da  aImmunological profile of mice immunized with a polyvalent virosome-based influenza vaccine.h[electronic resource]  c2023  aNa publicação: Francisco Noé Fonseca; Ana Paula Bastos.  aAbstract Background: Influenza A virus (IAV) causes respiratory disease in pigs and is a major concern for public health. Vaccination of pigs is the most successful measure to mitigate the impact of the disease in the herds. Influenza-based virosome is an effective immunomodulating carrier that replicates the natural antigen presentation pathway and has tolerability profile due to their purity and biocompatibility. Methods: This study aimed to develop a polyvalent virosome influenza vaccine containing the hemagglutinin and neuraminidase proteins derived from the swine IAVs (swIAVs) H1N1, H1N2 and H3N2 subtypes, and to investigate its effectiveness in mice as a potential vaccine for swine. Mice were immunized with two vaccine doses (1 and 15 days), intramuscularly and intranasally. At 21 days and eight months later after the second vaccine dose, mice were euthanized. The humoral and cellular immune responses in mice vaccinated intranasally or intramuscularly with a polyvalent influenza virosomal vaccine were investigated. Results: Only intramuscular vaccination induced high hemagglutination inhibition (HI) titers. Seroconversion and seroprotection (&gt4-fold rise in HI antibody titers, reaching a titer of ?1:40) were achieved in 80% of mice (intramuscularly vaccinated group) at 21 days after booster immunization. Virus-neutralizing antibody titers against IAV were detected at 8 months after vaccination, indicating long-lasting immunity. Overall, mice immunized with the virosome displayed greater ability for B, effector-T and memory-T cells from the spleen to respond to H1N1, H1N2 and H3N2 antigens. Conclusions: All findings showed an efficient immune response against IAVs in mice vaccinated with a polyvalent virosome-based influenza vaccine.  aInfluenza A virus  aVaccination  aInfluenza Aviaria  aVacina  aVacinação  aVírus  aNanovaccine  aNanovacina  aNanovacinação  aSeroprotection  aSoro imunológico  aSoro proteção  aSoroproteção  aVaccine1 aHAACH, V.1 aBELLAVER, F. V.1 aBOMBASSARO, G.1 aGAVA, D.1 aSILVA, L. P. da1 aBARON, L. F.1 aSIMONELLY, M.1 aCARVALHO, W. A.1 aSCHAEFER, R.1 aBASTOS, A. P. A.  tVirology Journalgv. 20, 2023. Article number 187.