Influenza virus infectivity, pathogenicity, and transmissibility in humans
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1 Influenza virus infectivity, pathogenicity, and transmissibility in humans Ron A.M. Fouchier, Ph.D. Department of Virology & National Influenza Centre FAO-OIE-WHO Scientific consultation on avian influenza at the human animal interface Verona, October 7-9, 2008 Avian influenza A virus - Adaptation to humans - Known mutations affecting infectivity and pathogenicity in humans Effects of these mutations on infectivity, pathogenicity and transmissibility Interplay between mutations Antiviral resistance mutations What are the effects of molecular/antigenic structure, strain, HP/LPAI status, virus dose, and other properties on infectivity, pathogenicity, transmission Contrast H5N1 and H7N7 1
2 Avian influenza A virus - Adaptation - E. De Wit & R.A.M. Fouchier, J Clin Virol (2008) E. De Wit, Y. Kawaoka, M.D. De Jong & R.A.M. Fouchier, Vaccine (2008) HA NS1 PB1, PB2, PA, NP NA Avian influenza A H5N1 virus - HA: Receptor specificity - Shinya et al., Nature 440, 2006 Van Riel et al., Science 312, 2006 Van Riel et al., Am J Pathol 171,
3 Influenza A virus - Host differences in sialic acid receptors - Simplification: - Variation hosts Neu5Ac-α2,3-Gal - Variation tissues - Variation in sialic acids - Not absolute Neu5Ac-α2,6-Gal Avian influenza A H5N1 virus - HA: Receptor specificity - 3
4 Avian HPAI H7N7 virus (NL) - Polymerase activity in human cells - PA PB2 PB2 33 C 37 C 41 C PB2 E627K increased expression, independent of temperature. PA has an additive effect. Avian HPAI H5N1 virus - Polymerase activity - 627K 627E A/Vietnam/1204/2004 Hatta et al., PLoS Pathogens
5 Influenza A virus - Replication temperature & host cell factors; RNPs - Intestinal tract 41 C Upper respiratory tract 33 C % activity Avian flu Polymerase 41 C 33 C Human flu Polymerase Naffakh et al., J Gen Virol 81: (2000) De Wit, Munster et al., In preparation Avian influenza A virus - Modulation of host (innate) immune responses - NS1: determinant of pathogenicity in mice, ferrets, chicken, human? (e.g. Dybing 2000, Cheung 2002, Lipatov 2005, Chan 2005, De Jong 2006, Twu 2007) Glu-92: resistance to TNF, IFNs (pigs) (Seo et al., 2002, 2004) Ser-42: IFN antagonism (mice) (Jiao et al., 2008) Ala-149: IFN antagonism (chicken) (Li et al., 2006) Phe-103 & Met-106: mrna processing (Twu et al., 2007) C-term PDZ: pathogenicity, not IFN (mice) (Jackson et al., 2008) PB1-F2: determinant of pathogenicity in mice? Ser-66: replication, pathogenicity, cytokine secretion (Conenello et al., 2007) 5
6 Avian HPAI H5N1 virus - NA; stalk deletion - Influenza A H7N7 virus - Determinants of infectivity in human cells - Virus # amino acid substitutions in Gene Segment A/Netherlands/219/03 (FC) Phenotype 1 (PB2) 5 (S79I,V297I,R355K,Q563R,E627K) Replication 2 (PB1) 0 3 (PA) 1(F666L) Replication 4 (HA) 3(I13S,A143T,K416R) Receptor binding 5 (NP) 0 6 (NA) 4(N308S, A346V, T442A, P458S) Particle release 7 (MA) 0 8 (NS) 1(V137I) Sequence as compared to A/Chicken/Netherlands/1/03 6
7 Influenza A H5N1 virus - Cynomolgus macaques - #2 Lung, HE #2 Lung, αnp #2 Bronchus, HE #2 Bronchus, αnp #4 Lung, HE #4 Lung, HE 4 dpi, 7 dpi Kuiken et al., Vet. Pathol. 40: (2003). Influenza A H5N1 virus - Pathogenesis in Cynomolgus macaques - Severe necrotizing broncho-interstitial pneumonia Necrotic lesions in kidney, liver, spleen and lymph nodes High virus titers in respiratory tract No evidence for virus replication in heart, brain, spleen (virus titration, immunohistochemistry) ARDS & MODS may be caused by severe lesions and virus replication in lungs alone Rimmelzwaan et al., J Virol 75: (2001). Kuiken et al., Vet. Pathol. 40: (2003). 7
8 Avian influenza A (H5N1) in felids - Experimental infection of domestic cats - Kuiken et al., Am J Pathol. 168: (2006) Avian influenza A (H5N1) virus - Extra-respiratory spread in man? - Cats Ganglioneuritis in intestines Encephalitis, virus in brains Hepatitis in cats Humans Diarrhea, virus in feces Encephalitis, virus in CSF High liver enzymes 8
9 H7N7 in The Netherlands - Pathogenesis in mice; fatal case vs. conjunctivitis - Bodyweight (%) Days after infection Conjunctivis virus 3 x 10 3 EID 50 Fatal case virus 3 x 10 3 EID 50 Munster, de Wit, et al.j. Inf. Dis. (2007) Human influenza A H7N7 virus pathogenicity - Pathogenesis in mice; PB2 E627K - Fatal case vs. conjunctivitis case Reassortants; CC virus + PB2 of FC virus Point mutations; CC virus + PB2 E627K Munster, de Wit, et al.j. Inf. Dis. (2007) 9
10 Human influenza A H7N7 virus pathogenicity - Systemic replication in mice: PB2 and HA - Black: wildtype viruses A: Conjunctivitis case (CC) B: Fatal case (FC) Gray: reassortants C: CC+PB2 of FC D: CC+PA of FC E: CC+HA of FC F: CC+NA of FC G: CC+NS of FC White; point mutants H: CC + PB2 E627K I: FC + PB2 K627E Munster, de Wit, et al.j. Inf. Dis. (2007) Human influenza A H7N7 virus pathogenicity - Pathology in mice - H&E IHC H&E IHC Munster, de Wit, et al.j. Inf. Dis. (2007) 10
11 Human influenza A H5N1 virus pathogenicity - virulence in mice - Source: Molecular Basis for High Virulence of Hong Kong H5N1 Influenza A Viruses. M.Hatta, P.Gao, P. Halfmann and Y. Kawaoka. Science 293: , Avian influenza A virus - Transmission models - Kilbourne Monto Katz Palese 11
12 Avian influenza A virus - Transmission models - A million ways to destroy a car Only one way to build one, properly Avian influenza A H5N1 virus - Neuraminidase inhibitor resistance - 12
13 Influenza A H1N1 virus - Neuraminidase inhibitor resistance - Lackenby et al., Euro Surveill Rameix-Welti et al., PLoS Pathogens 2008 Avian influenza A H5N1 virus - Neuraminidase inhibitor resistance - VN1203 (sensitive) H274Y (oseltamivir resistant) N294S (zanamivir resistant) Yen et al., J. Virol
14 A/H5N1 virus - Genetic variation - Source: Avian influenza - Transmissibility of H7N7 versus H5N1? - De Wit et al., Vaccine (2008) Olofsson et al., Lancet Inf Dis (2005) 14
15 Avian influenza virus adaptation - interplay between genes and gene products - Avian influenza A virus -Infectivity, pathogenicity, transmissibility in humans - -Determinants of infectivity & pathogenicity of avian influenza viruses - HA/NA; host cell receptors - Polymerase genes; body temp & cellular factors - NS; innate immunity -Multiple mutations, in several genes, some may act in concert -Pathogenicity often linked to efficient replication, sometimes other factors -Pathogenicity may vary in different models (humans?) -Basic cleavage site is a determinant of infectivity/pathogenicity in mammals -No good clues to determinants of transmission; -Animal models available -Multiple gene products in right conformation needed -Strain & dose-dependent differences in infectivity, pathogenicity, transmission? -Mutations affecting neuraminidase inhibitor resistance may occur without loss of infectivity or pathogenicity in animal models 15
16 Avian influenza A virus -Infectivity, pathogenicity, transmissibility in humans - Future work: -Receptor studies HA and NA, with focus on natural receptors -Glycan arrays; integrate with biology -Other determinants of infectivity, pathogenicity (consider H5N1 lineages) -Pathogenesis in humans -Pathogenesis in mammalian models (multiple) -Host-specific factors affecting replication (e.g. polymerase complex) -Transmission studies (ferrets and guinea pigs) -Alternatives for antivirals in outbreak management
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