Evaluation of live avian-human reassortant influenza A H3N2 and H1N1 virus vaccines in seronegative adult volunteers.
Identifieur interne : 000495 ( PubMed/Corpus ); précédent : 000494; suivant : 000496Evaluation of live avian-human reassortant influenza A H3N2 and H1N1 virus vaccines in seronegative adult volunteers.
Auteurs : M H Snyder ; M L Clements ; R F Betts ; R. Dolin ; A J Buckler-White ; E L Tierney ; B R MurphySource :
- Journal of clinical microbiology [ 0095-1137 ] ; 1986.
English descriptors
- KwdEn :
- Adult, Antibodies, Viral (biosynthesis), Hemagglutinins, Viral (immunology), Humans, Influenza A Virus, H1N1 Subtype, Influenza A Virus, H3N2 Subtype, Influenza A virus (growth & development), Influenza A virus (immunology), Neuraminidase (immunology), Viral Vaccines (immunology), Virus Replication.
- MESH :
- chemical , biosynthesis : Antibodies, Viral.
- chemical , immunology : Hemagglutinins, Viral, Neuraminidase, Viral Vaccines.
- growth & development : Influenza A virus.
- immunology : Influenza A virus.
- Adult, Humans, Influenza A Virus, H1N1 Subtype, Influenza A Virus, H3N2 Subtype, Virus Replication.
Abstract
An avian-human reassortant influenza A virus deriving its genes coding for the hemagglutinin and neuraminidase from the human influenza A/Washington/897/80 (H3N2) virus and its six "internal" genes from the avian influenza A/Mallard/NY/6750/78 (H2N2) virus (i.e., a six-gene reassortant) was previously shown to be safe, infectious, nontransmissible, and immunogenic as a live virus vaccine in adult humans. Two additional six-gene avian-human reassortant influenza viruses derived from the mating of wild-type human influenza A/California/10/78 (H1N1) and A/Korea/1/82 (H3N2) viruses with the avian influenza A/Mallard/NY/78 virus were evaluated in seronegative (hemagglutination inhibition titer, less than or equal to 1:8) adult volunteers for safety, infectivity, and immunogenicity to determine whether human influenza A viruses can be reproducibly attenuated by the transfer of the six internal genes of the avian influenza A/Mallard/NY/78 virus. The 50% human infectious dose was 10(4.9) 50% tissue culture infectious doses for the H1N1 reassortant virus and 10(5.4) 50% tissue culture infectious doses for the H3N2 reassortant virus. Both reassortants were satisfactorily attenuated with only 5% (H1N1) and 2% (H3N2) of infected vaccines receiving less than 400 50% human infectious doses developing illness. Consistent with this level of attenuation, the magnitude of viral shedding after inoculation was reduced 100-fold (H1N1) to 10,000-fold (H3N2) compared with that produced by wild-type virus. The duration of virus shedding by vaccines was one-third that of controls receiving wild-type virus. At 40 to 100 50% human infectious doses, virus-specific immune responses were seen in 77 to 93% of volunteers. When vaccinees who has received 10(7.5) 50% tissue culture infectious doses of the H3N2 vaccine were experimentally challenged with a homologous wild-type human virus only 2 of 19 (11%) vaccinees became ill compared with 7 of 14 (50%) unvaccinated seronegative controls ( P < 0.025; protective efficacy, 79%). Thus, three different virulent human influenza A viruses have been satisfactorily attenuated by the acquisition of the six internal genes of the avian influenza A/Mallard/NY/78 virus. The observation that this donor virus can reproducibly attenuate human influenza A viruses indicates that avian-human influenza A reassortants should be further studied as potential live influenza A virus vaccines.
PubMed: 3711273
Links to Exploration step
pubmed:3711273Le document en format XML
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<author><name sortKey="Clements, M L" sort="Clements, M L" uniqKey="Clements M" first="M L" last="Clements">M L Clements</name>
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<author><name sortKey="Betts, R F" sort="Betts, R F" uniqKey="Betts R" first="R F" last="Betts">R F Betts</name>
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<author><name sortKey="Dolin, R" sort="Dolin, R" uniqKey="Dolin R" first="R" last="Dolin">R. Dolin</name>
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<author><name sortKey="Buckler White, A J" sort="Buckler White, A J" uniqKey="Buckler White A" first="A J" last="Buckler-White">A J Buckler-White</name>
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<front><div type="abstract" xml:lang="en">An avian-human reassortant influenza A virus deriving its genes coding for the hemagglutinin and neuraminidase from the human influenza A/Washington/897/80 (H3N2) virus and its six "internal" genes from the avian influenza A/Mallard/NY/6750/78 (H2N2) virus (i.e., a six-gene reassortant) was previously shown to be safe, infectious, nontransmissible, and immunogenic as a live virus vaccine in adult humans. Two additional six-gene avian-human reassortant influenza viruses derived from the mating of wild-type human influenza A/California/10/78 (H1N1) and A/Korea/1/82 (H3N2) viruses with the avian influenza A/Mallard/NY/78 virus were evaluated in seronegative (hemagglutination inhibition titer, less than or equal to 1:8) adult volunteers for safety, infectivity, and immunogenicity to determine whether human influenza A viruses can be reproducibly attenuated by the transfer of the six internal genes of the avian influenza A/Mallard/NY/78 virus. The 50% human infectious dose was 10(4.9) 50% tissue culture infectious doses for the H1N1 reassortant virus and 10(5.4) 50% tissue culture infectious doses for the H3N2 reassortant virus. Both reassortants were satisfactorily attenuated with only 5% (H1N1) and 2% (H3N2) of infected vaccines receiving less than 400 50% human infectious doses developing illness. Consistent with this level of attenuation, the magnitude of viral shedding after inoculation was reduced 100-fold (H1N1) to 10,000-fold (H3N2) compared with that produced by wild-type virus. The duration of virus shedding by vaccines was one-third that of controls receiving wild-type virus. At 40 to 100 50% human infectious doses, virus-specific immune responses were seen in 77 to 93% of volunteers. When vaccinees who has received 10(7.5) 50% tissue culture infectious doses of the H3N2 vaccine were experimentally challenged with a homologous wild-type human virus only 2 of 19 (11%) vaccinees became ill compared with 7 of 14 (50%) unvaccinated seronegative controls ( P < 0.025; protective efficacy, 79%). Thus, three different virulent human influenza A viruses have been satisfactorily attenuated by the acquisition of the six internal genes of the avian influenza A/Mallard/NY/78 virus. The observation that this donor virus can reproducibly attenuate human influenza A viruses indicates that avian-human influenza A reassortants should be further studied as potential live influenza A virus vaccines.</div>
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<Abstract><AbstractText>An avian-human reassortant influenza A virus deriving its genes coding for the hemagglutinin and neuraminidase from the human influenza A/Washington/897/80 (H3N2) virus and its six "internal" genes from the avian influenza A/Mallard/NY/6750/78 (H2N2) virus (i.e., a six-gene reassortant) was previously shown to be safe, infectious, nontransmissible, and immunogenic as a live virus vaccine in adult humans. Two additional six-gene avian-human reassortant influenza viruses derived from the mating of wild-type human influenza A/California/10/78 (H1N1) and A/Korea/1/82 (H3N2) viruses with the avian influenza A/Mallard/NY/78 virus were evaluated in seronegative (hemagglutination inhibition titer, less than or equal to 1:8) adult volunteers for safety, infectivity, and immunogenicity to determine whether human influenza A viruses can be reproducibly attenuated by the transfer of the six internal genes of the avian influenza A/Mallard/NY/78 virus. The 50% human infectious dose was 10(4.9) 50% tissue culture infectious doses for the H1N1 reassortant virus and 10(5.4) 50% tissue culture infectious doses for the H3N2 reassortant virus. Both reassortants were satisfactorily attenuated with only 5% (H1N1) and 2% (H3N2) of infected vaccines receiving less than 400 50% human infectious doses developing illness. Consistent with this level of attenuation, the magnitude of viral shedding after inoculation was reduced 100-fold (H1N1) to 10,000-fold (H3N2) compared with that produced by wild-type virus. The duration of virus shedding by vaccines was one-third that of controls receiving wild-type virus. At 40 to 100 50% human infectious doses, virus-specific immune responses were seen in 77 to 93% of volunteers. When vaccinees who has received 10(7.5) 50% tissue culture infectious doses of the H3N2 vaccine were experimentally challenged with a homologous wild-type human virus only 2 of 19 (11%) vaccinees became ill compared with 7 of 14 (50%) unvaccinated seronegative controls ( P < 0.025; protective efficacy, 79%). Thus, three different virulent human influenza A viruses have been satisfactorily attenuated by the acquisition of the six internal genes of the avian influenza A/Mallard/NY/78 virus. The observation that this donor virus can reproducibly attenuate human influenza A viruses indicates that avian-human influenza A reassortants should be further studied as potential live influenza A virus vaccines.</AbstractText>
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