university of wisconsin yoshihiro kawaoka final kawaoka... · 2020-03-11 · university of...
TRANSCRIPT
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• H5N1 avian influenza viruses• Viruses possessing the 1918 virus HA and NA
University of Wisconsin Yoshihiro Kawaoka
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NA
HA
Viral RNA- single stranded
RNA polymerasePAPB1PB2
NP
M2
8 RNA segments
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8 RNA segments
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256
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Reverse genetics
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budding
uncoating
Anti-influenza drugs
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budding
uncoating
Anti-influenza drugs
NA inhibitors• oseltamivir• zanamivir
M2 inhibitors • amantadine and rimantadine
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H5N1 avian influenza virus
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Systemic infection Localized infection
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HA
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Host protease
HA cleavage is essential for viral infectivity.
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- - - - -ER R R R K K R R R RXX
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Representative experiments with H5N1 viruses - Determinants affecting pathogenicity of influenza virus -
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H5N1 Influenza Chronology in 1997
May November December
1 10 20 30 1 10 20 31
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ER R R R K K R RH5N1 Hong Kong virusHA cleavage site
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H5N1 Influenza Chronology in 1997
May November December
1 10 20 30 1 10 20 31
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• Importance of high HA cleavability for pathogenicity of the Hong Kong virus in mice
• Molecular basis for the difference in mouse pathogenicity among the Hong Kong viruses
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• Importance of high HA cleavability for pathogenicity of the Hong Kong virus in mice
• Molecular basis for the difference in mouse pathogenicity among the Hong Kong viruses
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HK483 HK486
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8 RNA segments
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HK483HK486
LD50=<10YESNO
NONO
NONONONO
YESNO
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Difference between HK483 and HK486
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• Amino acid alteration from glutamic acid to lysine at position 627of PB2 enhances the pathogenicity of an H5N1 virus in mice.
• All human virus PB2 proteins possess lysine at this position.
LD50
<10
<10
>1,000
>1,000
LD50
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Determinants affecting pathogenicity of influenza virus
• HA cleavability
• PB2 amino acid at position 627 and others
• NS1 protein
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Sensitivity of H5N1 viruses to oseltamivir
IC50 1-10nMHuman H3N2 viruses
H5N1virusesIC50 3.4nM
H5N1 viruses are sensitive to oseltamivir
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RISK ASSESSMENT• Noninfectious • Inability to insert into humangenome
NIH Guidelines1, App. B.1; 9 CFR2 121.3f.2
1 NIH Guidelines, NIH Guidelines for Research Involving Recombinant DNA Molecules2 9 CFR 121, Title 9 Code of Federal Regulations
Molecular cloning (genetic material)
RISK GROUP 1
BIOSAFETYLEVEL
BSL-2
H5N1 viruses isolated since 1997 in Asia
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RISK ASSESSMENT
BIOSAFETYLEVEL
BSL-3ABSL-3
NIH Guidelines, Sect. IIA; 9 CFR 121.3d
RISK GROUP 3
H5N1 viruses isolated since 1997 in Asia
• Known to cause lethal infectionin avian species and humans
• Aerosol transmission • Prophylaxis available • low human-to-human transmission
Virus generation, cell culture, experimental infection (mice, ferrets, chickens)
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H5N1 viruses isolated since 1997 in Asia
SPECIFIC PRACTICES
PAPRs: Powered air-purifying respirators
1) Annual vaccination required2) Prophylaxis when aerosols likely3) PAPRs with face shields4) Shower out5) Susceptibility testing of agents
Virus generation, cell culture, experimental infection (mice, ferrets, chickens)
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Additional features/procedures in BSL-3 at UW
1) Entry/exit through change and shower rooms2) Double-door autoclave3) Shower facilities4) Daily decontamination of work surfaces5) All personal clothing removed in outer change rooms6) Established system for reporting and treating exposures7) Annual inspection by federal regulatory agencies8) Contact with non-experimental mice, ferrets, and
chickens is prohibited within one week of contact with experimentally infected animals
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Experiments with viruses possessing the 1918 virus genes
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Reid AH et al. PNAS (1999)Reid AH et al. PNAS (2000)
The Spanish influenza virus does not exist.
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HA
NA
1918 virus
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Origin of Genes LD50(Log10 PFU)(Log10 PFU)
VirusHA
Virus titerin lung
NA OthersWSN (H1N1) WSN WSN WSNWSN/HspNsp WSN 3.0
3.35.0 ± 0.15.0 ± 0.3
M88 (H3N2) M88 M88 M88 >6.2 2.9 ± 0.2M88/Hsp K173 M88 4.4 5.1 ± 0.1M88/HspNsp M88 5.2 4.7 ± 0.2
K173 (H1N1) K173 K173 K173 >7.4 3.5 ± 0.3K173/Hsp K173 K173 5.2 4.8 ± 0.2K173/HspNsp 1918 K173 6.9 ND1918
1918
1918
1918
1918
1918
1918
Properties of viruses with the 1918 virus HA and/or NA in mice
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Detection of viral neutralizing antibodies
Virus a virus with the 1���virus HA and NA
Sera
102 years old(born in 1897�
1 year old(born in 2001�
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Neutralizing antibodies to a virus with the 1918 virus HA and NA
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RISK ASSESSMENT
• Noninfectious • Inability to insert into humangenome
NIH Guidelines1, App. B.1; 9 CFR2 121.3f.2
1 NIH Guidelines, NIH Guidelines for Research Involving Recombinant DNA Molecules2 9 CFR 121, Title 9 Code of Federal Regulations
Molecular cloning (genetic material)
RISK GROUP 1
Viruses with the 1918 virus HA and NA genes
BIOSAFETYLEVEL
BSL-2
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Viruses with the 1918 virus HA and NA genes
RISK ASSESSMENT
BIOSAFETYLEVEL
BSL-4
NIH Guidelines, Sect. IIA; 9 CFR 121.3d
Virus generation, cell culture, experimental infection (mice)
• Potential risk for human infection• Increased pathogenicity• Human population may be susceptible• Aerosol transmission• Potential for human-to-human transmission• Protection with current vaccines ???• Prophylaxis ???
RISK GROUP 3 or 4 ?
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4 hours laterchallenge
Prophylaxis of a virus with the 1918 virus HA and NA with oseltamivir
oseltamivir
?oseltamivir, daily
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Oseltamivir protects mice from challenge with a virus possessing the 1918 virus HA and NA
Oseltamivir
Days after infection
PBS
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Tumpey et al. (2002) PNAS 99, 13849
A virus with the 1918 virus NA is sensitive to oseltamivir carboxylate
oseltamivir carboxylate
In vitro Mouse model
Antiviral
1918HA/NAoseltamivir
PBS
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Tumpey et al. (2004) PNAS 101, 3166
Protection of mice against a virus with the 1918 HA and NA usinginactivated vaccine made from a contemporary H1 strain
Vaccine
Days after infection
PBSX31 (H3N2)
1918 HA/NA
N.Cal/99 (H1N1)
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Viruses with the 1918 virus HA and NA genes
RISK ASSESSMENT
BIOSAFETYLEVEL
BSL-3
NIH Guidelines, Sect. IIA; 9 CFR 121.3d
Virus generation, cell culture, experimental infection (mice)
• Potential risk for human infection• Likelihood of increased pathogenicity• Human population may be susceptible• Aerosol transmission• Potential for human-to-human transmission• Current vaccines may offer protection• Prophylaxis available
RISK GROUP 3
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SPECIFIC PRACTICES
PAPRs: Powered air-purifying respirators
1) Annual vaccination required2) Prophylaxis when aerosols likely3) PAPRs with face shields4) Shower out5) Susceptibility testing of agents
Virus generation, cell culture, experimental infection (mice)Viruses with the 1918 virus HA and NA genes
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Additional features/procedures in BSL-3 at UW
1) Entry/exit through change and shower rooms2) Double-door autoclave3) Shower facilities4) Daily decontamination of work surface5) All personal clothing removed in outer change rooms6) Established system for reporting and treating exposures7) Annual inspection by federal regulatory agencies