Research Issues in Animal Surveillance and Pandemic Planning Robert G. Webster, PhD Division of Virology Department of Infectious Diseases St. Jude Children’s.

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Presentation transcript:

Research Issues in Animal Surveillance and Pandemic Planning Robert G. Webster, PhD Division of Virology Department of Infectious Diseases St. Jude Children’s Research Hospital

SURVEILLANCE

Spread of H5N1 Influenza in Asia s of millions of birds culled Human Cases: 70 Human Deaths: 47 Vietnam: 33 deaths Thailand: 12 deaths Cambodia 2 deaths

The Difficulty of Obtaining Avian H5N1 Viruses Trade embargos National pride Intellectual property Different missions for FAO, OIE and WHO Absence of infrastructure

The Hong Kong Model No H5N1 influenza in poultry or humans in 2004, 2005

The 1997 H5N1 Outbreak in Hong Kong FIRST BUILD THE INFRASTRUCTURE Nov small lab, 1 ancient hood Dec. 1997The brightest and best trained young virologists flown in Laminar flow cabinets flown in Temporary isolation lab established Staff stay on the ground No human infections: virus availability Collaboration Agriculture, Health Department, University, WHO

Current Advice to Countries with Poor Infrastructure After SARS and laboratory infection of humans –Do not attempt to isolate viruses –Use molecular analysis – RT PCR –Send samples to expert laboratories

Changes in Poultry Marketing in Hong Kong Two clean days per month Inactivated H5N1 vaccine –Sentinal birds No H5N1 2004, 2005

Why is the Hong Kong H5N1 Control Strategy Not Copied? Too expensive! Reluctance to accept agricultural vaccines Lack of promotion by international agencies Lack of political will

Agriculture Vaccines Not standardized for antigen content Required to induce HI antibody in poultry There are good and bad agricultural vaccines

Vaccines for use in Poultry (Traditional) Hong KongCommercialA/CK/Mexico/232/94/ (H5N2)* ChinaCommercialA/DK/England/N-28/73 (H5N2) IndonesiaA/CK/Indonesia/03 (H5N1) [H.P] *Homology of HA ≈ 94% with current H5/04

Recent Developments in Poultry Vaccines Fowlpox – H5China, US r.g. -- H5N1H9N2 backbone China r.g. -- H5N3PR8 backbone US

Poultry Vaccines (The Good Ones) Provide protection despite antigenic drift Mechanism unresolved Do not provide sterilizing immunity Can reduce virus load below level of transmission

Poultry Vaccines (The Bad Ones) Protect against disease signs Birds shed transmissible levels of virus Promotes spread of virus in live markets and antigenic drift

Missing Information The role of domestic ducks

Ducks Vietnam 60 million – many free range –Reduce to 40 million (commercial hatching ban) Peak numbers in May, October –Rice Harvest

Continuing Evolution of H5N1 in Ducks in Asia Nov. 2002H5N1 kills waterfowl in Hong Kong 2003Majority of H5N1 isolates are highly pathogenic in ducks 2004Many duck H5N1 isolates are non-pathogenic in ducks

Lethality of H5N1/04 Viruses for Ferrets Isolated from No. Tested SevereMild Humans440 Duck313 Chicken404

700, , , , , , , ,000 20,000 15,000 10,000 5, ,000 25,000 15,000 10,000 5, ,000 20,000 60,000 40,000 20,000 10, ,000 30, ChinaThailand Viet NamIndonesia Trends in Duck Populations (FAOSTAT 2001)

Duck Population -- Asia ~ 2 BILLION domestic ducks 10 to 100 times more domestic than wild ducks

N. Korean Poultry Industry Could be Wiped Out An outbreak of deadly bird flu in North Korea could wipe out its fledgling chicken breeding industry and deprive the impoverished country of its main source of animal protein, animal experts said yesterday South China Morning Post, Asia Pacific, Tuesday, March 29, 2005

? ? ? ? ?

Summary Reduce the likelihood of human to human transmission by reducing virus load in poultry –Stamping out –Vaccination –Quality vaccines for poultry needed The immediate issue

Summary Transmissibility Pathogenicity The Asian Host Unresolved issues

St. Jude Children’s Research Hospital Thailand Bureau of Disease Control and Veterinary Services Dr. Chantanee Buranathai Support: AI95357, NIAID, ALSAC Richard Webby, Elena Govorkova, Erich Hoffmann and The Influenza Support Staff Hong Kong University Drs. Yi Guan, Malik Peiris, Leo Poon, K.Y. Yuen Influenza Research Group Indonesian Ministry of Research & Technology Dr. Amin Soebandrio Vietnamese Ministry of Agriculture and Rural Health Development Dr. TD Nguyen