A M Iorio

Università degli Studi di Perugia, Perugia, Umbria, Italy

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Publications (50)92.63 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: We analyzed humoral and cellular immune responses against vaccine antigens and the new A(H1N1) virus in healthy adults before and after immunization with the 2007/2008 commercially available trivalent subunit MF59-adjuvanted influenza vaccine during the Fall 2007, prior to the emergence of the new virus. Antibody titers were significantly boosted only against the three vaccine antigens. Seasonal vaccination boosted pre-existing cellular responses upon stimulation of peripheral blood mononuclear cells not only with the homologous three vaccine antigens, but also with the heterologous new 2009 A(H1N1) and with a highly conserved peptide present in the stalk region of hemagglutinin (HA). These results show that cross-reactive cell responses against the new virus were present before the circulation of the virus and were boosted by seasonal vaccination. The cross-reactivity of cellular responses might, at least in part, explain the low pathogenicity of the new pandemic virus. The finding of cellular immunity, that can be increased by seasonal vaccination, against the conserved HA peptide, underline the potential use, in human vaccines, of conserved peptides of the stalk region of HA characterized by broad immunogenicity in experimental systems.
    Vaccine 02/2012; 30(9):1617-23. · 3.77 Impact Factor
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    10th NATIONAL CONGRESS OF THE ITALIAN SOCIETY FOR VIROLOGY; 09/2011
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    ABSTRACT: The surveillance network RotaNet-Italia was established in 2007 in order to investigate the diversity of co-circulating rotavirus strains in Italy, and to provide a baseline for future assessment of possible effects of vaccine implementation in selecting novel versus common rotavirus strains. A total of 2,645 rotavirus strains from pediatric patients with acute diarrhea were collected over three conse-cutive seasons from September 2006 through August 2009, and partially characterized by standardized multiplex RT-PCR. Most of strains (89.1%) belonged to genotypes G1–G4, and G9, associated with either P[8] or P[4], commonly found in humans worldwide. However, in at least 2.0% of cases, viruses exhibited either a G or P type typical of animal viral strains, sug-gesting gene reassortment events between rotaviruses of different origin. Mixed infections with two or more rotavirus strains were observed frequently (7.6% of patients), and depended on the frequencies of co-circulating rotaviruses of one particular genotype. The numbers and genotypes of likely natural reas-sortants of common genotype rotaviruses were found to be correlated with the observed num-bers and genotypes of mixed infections. Large variation in the relative frequency of different rotavirus genotypes was observed between dif-ferent seasons and/or areas of Italy, suggesting independent evolution or differential introduc-tion of viral strains with respect to both time and space.
    Journal of Medical Virology 01/2011; 83:0146-6615. · 2.37 Impact Factor
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    ABSTRACT: We measured haemagglutination inhibiting (HI) serum antibody titers to vaccine matched A/H1N1 influenza virus strain and to the new pandemic 2009 A/H1N1 (pH1N1) virus in two groups of volunteers prior and after 2003/2004 or 2007/2008 influenza seasonal vaccine administration. The responses were examined considering the overall volunteers studied in the two winters (144 and 79, respectively) and grouping those subjects in birth cohort classes (1903–1919; 1920–1957; 1958–1977). Before vaccination, HI antibody titers were found in all the groups examined and, on comparing the different age-groups, titers were higher in the younger groups as compared with the oldest against the A/H1N1 seasonal strains but titers were higher in the oldest as compared with the younger ones against the pH1N1 strain. Vaccination induced significant increases in HI titers against the matched A/H1N1 vaccine strains in all the groups examined. The responses satisfied the EMEA criteria and were higher in the youngest volunteers as compared with older groups. Increases were also found in the level of cross-reactive HI antibodies to the new pandemic 2009 A/H1N1 virus although in most instances the requirements of the EMEA were not met.
    Procedia in Vaccinology 01/2011; 4:50-58.
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    ABSTRACT: The study evaluated the immunogenicity and efficacy of a trivalent subunit MF59-adjuvanted influenza vaccine (A/Wisconsin/67/05 (H3N2), A/Solomon Islands/3/06 (H1N1) and B/Malaysia/2506/04) in preventing serologically diagnosed infections in a group of 67 institutionalized elderly volunteers during 2007/2008 winter, characterized by co-circulation of drifted A/H3N2, A/H1N1 and B influenza viruses. Influenza vaccination induced a significant increase in the amounts of hemagglutination inhibiting antibodies, both against the vaccine and the epidemic drifted strains. However, vaccination did not prevent the circulation of the new drifted influenza B virus (B/Florida/4/06-like), belonging to the B/Yamagata/16/88-lineage, antigenically and genetically distinct from B/Victoria/2/87-lineage viruses from which the vaccine B strain was derived.
    Vaccine 11/2010; 28(47):7536-41. · 3.77 Impact Factor
  • B Camilloni, M Neri, E Lepri, A M Iorio
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    ABSTRACT: This study evaluated whether MF59-adjuvanted subunit trivalent influenza vaccine for the 2003/04 winter season (A/Moscow/10/99, H3N2; A/New Caledonia/20/99, H1N1; B/Hong Kong/330/01) would confer protection against mismatched and frequently co-circulating variants of influenza B/Victoria- and B/Yamagata-like virus strains. Haemagglutination inhibiting (HI) antibodies were measured in middle-aged and elderly volunteers against the homologous B/Victoria-like vaccine strain (B/Hong Kong/330/01) and against mismatched B/Victoria-like (B/Malaysia/2506/04) and B/Yamagata-like (B/Singapore/379/99 and B/Shanghai/361/02) strains. Immunization induced significant increases in the amounts of HI antibodies against all influenza B strains under investigation. However, the responses against the heterologous B/Shanghai/361/02 virus did not reach the desirable values of seroprotection. An age-dependent decline of the responses was found for B/Victoria-like antigens, but not for B/Yamagata-like strains. Although further studies are needed, our data support the recommendation of including influenza B viruses of the B/Victoria and B/Yamagata lineages in the future influenza vaccine preparations.
    Vaccine 06/2009; 27(31):4099-103. · 3.77 Impact Factor
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    ABSTRACT: Concern about the possibility that annually repeated influenza immunizationmayinduce a lower antibody response than first vaccination. To ascertain the cumulative effects of yearly vaccination on serological response to unaltered vaccine antigens in the elderly. The haemagglutination-inhibiting (HI) antibody response was examined in 158 elderly institutionalized frail volunteers subdivided in 3 groups according to the sequential winters in which each subject received a trivalent inactivated influenza vaccine. The study, conducted over 5 consecutive winters (from 1998/99 to 2002/03), reports the antibody response only for sequential years (2 or 3) in which the vaccine strain examined was not altered. Significant increases in the values of HI antibody titres were observed after vaccination in each year examined against the different influenza vaccine strains used, except against B antigen in the second of the 3 winters studied (1999/00). The antibody responses found were not always adequate, i.e. at levels above the currently requested values for commercial vaccines (post-vaccination seroprotection rate >/=1:40, increases in geometric mean titres >/=2, positive responses >/=30% compared with pre-vaccination), probably because of old age (mean age >/=81 years) and the presence of underlying diseases in a high percentage of volunteers (>/=86%). The most frequent chronic diseases found werecardiovascular diseases (48%), endocrine disorders (19%), functional disability (10%) and pulmonary diseases (4%). The post-vaccination values observed in the sequential years were in general similar for A/H3N2 and A/H1N1 vaccine strains. A decrease, however, for some parameters at statistically significant levels, was observed against B antigen following repeated vaccine administrations. Our data seem to support the possibility of a slight impairment of HI antibody response against unaltered influenza vaccine antigens, especially for influenza strains that have circulated for prolonged periods of time. Indeed a tendency to a lower response was found only against B/Beijing antigen, introduced in the vaccine composition in the winter 1995/96, but not against the A/H3N2 and A/H1N1 vaccine strains, which weremore frequently changed.
    Gerontology 01/2007; 53(6):411-8. · 2.68 Impact Factor
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    ABSTRACT: This study examined the antibody response against the three vaccine antigens and the epidemic A/H3N2 drift variant (A/California) and the prevention of laboratory diagnosed influenza infections in a group of elderly institutionalized people vaccinated with the 2004/2005 influenza vaccine. Antibody titres were measured by hemagglutination inhibition (HI) in sera collected before and 1 month after vaccination. Laboratory diagnosis was done examining throat swabs (RT-PCR or MDCK cell culture) or by serology (seroconversion comparing HI titres in sera collected 1 and 5 months after vaccination). Results obtained showed that influenza vaccination induced an adequate immune response against the three vaccine antigens and the epidemic A/H3N2 variant, however it was not capable of preventing an influenza outbreak due to the new A/H3N2 (A/California) variant.
    Vaccine 12/2006; 24(44-46):6615-9. · 3.49 Impact Factor
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    ABSTRACT: To study immunological and virological parameters in HIV-1-seropositive adults treated with highly active antiretroviral therapy (HAART) for at least 7 months after immunisation with MF59-adjuvanted (FLUAD, Chiron, Siena, Italy) or with non-adjuvanted (AGRIPPAL, Chiron) trivalent influenza vaccine. Blood samples, collected before and after vaccination, were analysed for the presence of antibodies against the vaccine antigens, for number of CD4+ T lymphocytes and HIV-1 RNA levels. Forty-four volunteers received FLUAD and 40 AGRIPPAL influenza vaccine. Thirty days after vaccination both adjuvanted and non-adjuvanted vaccines induced significant increases of anti-influenza virus antibodies. However, antibody titres found in volunteers receiving adjuvanted vaccine were in general significantly higher when compared with those found in the non-adjuvanted vaccine group. The requirements of the European Commission of influenza vaccine for a non-elderly adult population were always met by recipients of the adjuvanted vaccine, even in those with the lowest CD4+ cell counts (<200 cells/mmc). The subjects receiving the non-adjuvanted vaccine failed to met these requirements. The CD4+ T lymphocytes and plasma HIV-1 RNA levels remained stable in the long term, both in people receiving adjuvanted or non-adjuvanted vaccine. MF59-adjuvanted influenza induced a significant higher immune responses as compared with conventional vaccine in HIV-seropositive HAART-treated patients. Both vaccines were safe regarding HIV RNA viral replication and loss of CD4+ T lymphocytes.
    Vaccine 09/2003; 21(25-26):3629-37. · 3.49 Impact Factor
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    ABSTRACT: Flow cytometric analysis, used to study intracellular expression of IFN-gamma in peripheral blood mononuclear cells (PBMC) from aged volunteers before and after parenteral influenza vaccination, was found capable of rapidly detecting influenza antigen induced variation of IFN-gamma expression. Although the vaccine was capable of generating a satisfactory antibody response, it did not stimulate an increase in the percentage of IFN-gamma positive cells.
    Developments in biologicals 02/2003; 115:55-9.
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    ABSTRACT: Objective: To study immunological and virological parameters in HIV-1-seropositive adults treated with highly active antiretroviral therapy (HAART) for at least 7 months after immunisation with MF59-adjuvanted (FLUAD, Chiron, Siena, Italy) or with non-adjuvanted (AGRIPPAL, Chiron) trivalent influenza vaccine. Design: Blood samples, collected before and after vaccination, were analysed for the presence of antibodies against the vaccine antigens, for number of CD4+ T lymphocytes and HIV-1 RNA levels. Results: Forty-four volunteers received FLUAD and 40 AGRIPPAL influenza vaccine. Thirty days after vaccination both adjuvanted and non-adjuvanted vaccines induced significant increases of anti-influenza virus antibodies. However, antibody titres found in volunteers receiving adjuvanted vaccine were in general significantly higher when compared with those found in the non-adjuvanted vaccine group. The requirements of the European Commission of influenza vaccine for a non-elderly adult population were always met by recipients of the adjuvanted vaccine, even in those with the lowest CD4+ cell counts (
    Vaccine. 01/2003; 21(25):3629-3637.
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    ABSTRACT: To study the decreasing responsiveness of the immune system during aging, influenza virus specific cellular immunity was investigated in a cohort of healthy blood donors between 18 and 70 years of age. The percentage of influenza A virus specific T cells was determined by flow cytometry and found not to change during aging. After stimulation with phorbol 12-myristate 13-acetate and ionomycin, an increase in the percentage of IFN-gamma and IL-4 producing CD8(+) T cells was observed during aging. In addition, the cytotoxic T lymphocyte (CTL) activity was investigated in two additional groups of five donors, 18-20 and 68-70 years of age. The lytic capacity of purified CD8(+) T cells, after in vitro stimulation of peripheral blood mononuclear cells with influenza A virus, seemed lower in 68- to 70-year-old donors than in 18- to 20-year-old donors. Therefore we conclude that the reduced CTL activity in the elderly is not the result of a lower frequency of virus-specific T cells, but more likely the result of impaired antigen-specific proliferation or lower lytic capacity of these cells.
    Virology 08/2002; 299(1):100-8. · 3.37 Impact Factor
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    ABSTRACT: The World Health Organization (WHO) programme for "Global eradication of Poliomyelitis" established since 1988 has achieved substantial goals, and paralytic poliomyelitis, already eradicatedfrom the Americas, has also become a rare disease in many other parts ofthe world. The goal is realistic and could be reached during thefirst decade of the third millennium.To achieve the certification ofthe eradicàtion of poliomyelitis in a country, it must be verified that no paralytic poliomyelitis due to wild poliovirus occurs over an extended an active surveillance of Acute Flaccid Paralysis (AFP). In ltaly the active AFP surveillance started in 1996 as a pilot study, and was gradually extended at nationallevel in 1997. The rate of non-polio AFP found was 0.61 cases per 100,000 in 1997 and 0.67 in 1998. The values were lower than the rate of l case per 100,000, in the population aged less than 15 years, considered acceptable by the WHO. However, during the three year survey seven cases of vaccine associated paralytic poliomyelitis (VAPP) were identified and no wild poliovirus was detected. The underestimation of AFP cases in 1997 was particularly due to the delay in organizing the regional hospital network. ln 1998 an improvement of the biologica[ samples collection has been evidenced. This study is the first systematic attempt to determine the rate of AFP in Italy.
    Annali di igiene: medicina preventiva e di comunità 01/2000; 12:99-110.
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    ABSTRACT: The last case of poliomyelitis due to transmission of indigenous wild poliovirus occurred in Italy in 1982. To achieve the certification of the eradication of poliomyelitis in Italy, an active surveillance of acute flaccid paralysis (AFP) in the population aged less than 15 years was set up following the World Health Organization (WHO) guidelines. The survey started in 1996 with a pilot study involving 4 out of 21 regions, and was gradually extended to a national level in 1997. The two-year survey identified five patients with diagnosis of vaccine associated paralytic poliomyelitis (VAPP). Polioviruses type 2 and 3 Sabin-like were isolated and characterized in three of them. In the remaining two cases, samples were collected late after the onset of symptoms, and poliovirus could not be isolated. No wild polioviruses were detected during the survey. The rate of non-polio AFP found in Italy in 1997 was 0.61 cases per 100,000, which is lower than the level of 1.0 case per 100,000 considered as acceptable by the WHO. This was mainly due to the delay in organizing the hospital network and starting the active search of AFP cases in the largest and most densely populated regions. Therefore, the overall rate of AFP found in Italy underestimates the global effectiveness of the program, which however will be better evaluated in the next few years. This study is the first systematic attempt to determine the rate of AFP in Italy.
    European Journal of Epidemiology 01/1999; 15:591-592. · 5.12 Impact Factor
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    ABSTRACT: Concern about poor responsiveness to influenza vaccination by institutionalized elderly people. To determine whether institutionalized elderly volunteers develop a significant antibody response following influenza vaccine and to compare this response with that of non-institutionalized subjects. The haemagglutination-inhibiting antibody response after 1995-1996 influenza vaccination [A/Shangdong/9/93 (H3N2), A/Taiwan/1/86 (H1N1), B/Panama/45/90] was estimated in 80 elderly women living in a nursing home and compared with that of 51 non-institutionalized women. No differences were found in the prevaccination status, and, after vaccination, a significant humoral response was elicited both in institutionalized and non-institutionalized elderly subjects against all three influenza strains tested. The immune response of institutionalized patients was satisfactory and significantly higher than that observed in non-institutionalized women. These results were confirmed both by a separate analysis of homogeneous subgroups stratified according to the presence in the two cohorts of potential causes of differential antibody response (prevaccination antibody titre, age, long-term drug treatment, risk factors for influenza infection, and physical disability) and by logistic regression analysis in order to adjust immune responses for the different variables. Influenza vaccination is effective in elderly people living in nursing homes. However, the postvaccination antibody response to influenza vaccine is influenced by different factors directly or indirectly related to residence.
    Gerontology 01/1999; 45(1):31-8. · 2.68 Impact Factor
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    ABSTRACT: The humoral response (haemagglutination inhibiting antibodies) to trivalent split influenza vaccine for the 1993-94 winter season (A/Beijing/32/92 (H3N2), A/Singapore/6/86 (H1N1) and B/Panama/45/90) was evaluated in a group of young HIV-seropositive ex-intravenous heroin users and compared with responses measured in HIV-seronegative individuals with a similar history. HIV-negative volunteers showed an overall positive response suggesting that previous heroin use did not influence their humoral response to influenza vaccine. Comparable results were obtained in HIV-positive subjects with CD4+ lymphocyte counts > 500 microliters-1, whereas impaired reactivity was found in HIV-positive volunteers with CD4+ counts < 500 microliters-1. Booster vaccination did not increase antibody levels in any of the groups studied, although the data did not exclude a positive influence of a second vaccine dose on persistence of antibody at 120 days after the first dose. No significant changes were observed in p24 antigenemia levels in HIV-positive individuals after vaccination.
    Vaccine 01/1997; 15(1):97-102. · 3.49 Impact Factor
  • A M Iorio, M Neri, T Zei
    Pharmacological Research 10/1992; 26 Suppl 2:74-5. · 4.35 Impact Factor
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    ABSTRACT: The immunogenicity of inactivated whole trivalent influenza vaccines (A/Taiwan/1/86 (H1N1), A/Sichuan/2/87 (H3N2), and B ijing/1/87) recommended for the 1988-89 winter season was evaluated in 236 elderly (mean age 71 years) high risk volunteers. An overall significant increase in the number of subjects with protective haemagglutination inhibiting (HI) antibodies (titer > 1:40) against vaccine components was observed after vaccination. Nevertheless, a percentage of individuals (ranging from 56% to 62%) remained without protective antibodies and the number of people showing a positive response was limited (from 32% to 41%). By the comparative analysis of the results obtained examining the presence of protective levels of antibody in the sera from 91 volunteers using HI versus the single radial haemolysis (SRH) test, we obtained evidence for a higher sensitivity of SRH technique especially against B antigen.
    European Journal of Epidemiology 07/1992; 8(4):491-7. · 5.12 Impact Factor
  • T Zei, M Neri, A M Iorio
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    ABSTRACT: Trivalent split or subunit influenza vaccines [A/Shangai/11/87 (H3N2), A/Singapore/6/86 (H1N1) and B/Yamagata/16/88] recommended for the 1989-90 winter season and licensed in Italy, were administered to 149 volunteers of three different age groups (elderly, middle-aged and young). Antibody production was determined in pre- and postvaccination sera by haemagglutinin inhibition test and the results were evaluated as protection and response rates. The split vaccine was more immunogenic than the subunit preparation, especially against the B virus strain. Age had no obvious impact on the degree of responsiveness to vaccination.
    Vaccine 10/1991; 9(9):613-7. · 3.49 Impact Factor
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    ABSTRACT: The antibody response (determined using the single radial haemolysis in gel technique) to inactivated whole-virion trivalent influenza vaccine [A/Leningrad/360/86(H3N2), A/Taiwan/5/87 and B/Ann Arbor/1/86], recommended for the 1987-88 winter season in Italy, in 49 elderly (age greater than or equal to 60 years) subjects was compared with the response in 23 young adult (age less than 60 years) volunteers. The subjects were prevalently healthy and a high percentage of young and old people had been repeatedly immunized against influenza in previous years. No significant differences were detected among age groups; moreover, the immune response measured by seroconversion or by a significant rise in antibody titre was constantly low.
    Vaccine 09/1989; 7(4):341-4. · 3.49 Impact Factor