OIE Influenza Standards and Communication on Pandemic (H1N1) 2009

Transcription

1 OIE Influenza Standards and Communication on Pandemic (H1N1) 2009 AVIAN INFLUENZA: INTERSECTORAL COLLABORATION Larnaca, Cyprus July 2009 Kate Glynn DVM, MPVM Scientific and Technical Department

2 WORLD ORGANISATION FOR ANIMAL HEALTH (OIE) An intergovernmental organisation Founded in Members (In June 2009) Headquarters in Paris, France 5 Regional offices 4 Regional sub offices Mandate : to improve Animal Health worldwide

3 OIE Standards

4 Animal Health Standards - OIE Major Texts for Terrestrial Animals Terrestrial Animal Health Code (Terrestrial Code) Manual of Diagnostic Tests and Vaccines for Terrestrial Animals (Terrestrial Manual) OIE Principles Guidance, Standards, Transparency

5 Terrestrial Animal Health Code Structure Volume 1 cross-cutting, 'horizontal standards' Volume 2 disease-specific, 'vertical standards' The value of the Terrestrial Code is twofold represents consensus among the veterinary authorities of OIE Members constitutes a reference within the World Trade Organization Agreement on the Application of Sanitary and Phytosanitary Measures as an international standard for animal health and zoonoses

6 Terrestrial Manual Principal target readership - laboratories carrying out veterinary diagnostic tests and surveillance, plus vaccine manufacturers and regulatory authorities in Member Countries Objective - to provide internationally agreed diagnostic laboratory methods and requirements for the production and control of vaccines and other biological products

7 Notification and Reporting Chapter 1.1. Notification of diseases and epidemiological information Members shall.. Built upon a framework of a competent veterinary services and effective surveillance program

8 Criteria for Listing a Disease INTERNATIONAL SPREAD? EMERGING? NO YES ZOONOTIC POTENTIAL? NO SIGNIFICANT SPREAD IN NAIVE POPULATIONS? YES NO YES EXCLUDE INCLUDE EXCLUDE INCLUDE

9 Multiple species diseases: Anthrax Aujeszky's disease Bluetongue Brucellosis (B. abortus/melitensis/suis) Crimean Congo haemorrhagic fever Echinococcosis/hydatidosis Epizootic haemorrhagic disease Equine encephalomyelitis (Eastern) Foot and mouth disease Heartwater Japanese encephalitis Leptospirosis New world screwworm (Cochliomyia hominivorax) Old world screwworm (Chrysomya bezziana) Paratuberculosis Q fever Rabies Rift Valley fever Rinderpest Surra (Trypanosoma evansi) Trichinellosis Tularemia Vesicular stomatitis West Nile fever OIE Listed Diseases Avian diseases: Avian chlamydiosis Avian infectious bronchitis Avian infectious laryngotracheitis Avian mycoplasmosis (Mycoplasma gallisepticum) Avian mycoplasmosis (Mycoplasma synoviae) Duck virus hepatitis Fowl cholera Fowl typhoid Highly pathogenic avian influenza in birds and low pathogenicity notifiable avian influenza in poultry as defined in Chapter Infectious bursal disease (Gumboro disease) Marek's disease Newcastle disease Pullorum disease Turkey rhinotracheitis

10 Notification Procedures Types of Reports Immediate notification of disease, infection or unusual epidemiological events Weekly reports: Follow-up to the immediate notification Final report: if the outbreaks have ended (event closed) if the situation becomes endemic Six-monthly report Annual report

11 Emerging Disease a new infection resulting from the evolution or change of an existing pathogenic agent, a known infection spreading to a new geographic area or population, or a previously unrecognized pathogenic agent or disease diagnosed for the first time and which has a significant impact on animal or public health

12 Avian Influenza Terrestrial Code «Highly pathogenic avian influenza in birds and low pathogenicity notifiable avian influenza in poultry» ( 4.htm) For the purposes of international trade, Notifiable avian influenza (NAI) - an infection of poultry caused by any influenza A virus of the H5 or H7 subtypes or by any AI virus with an intravenous pathogenicity index (IVPI) greater than 1.2 (or as an alternative at least 75% mortality) as described below. highly pathogenic notifiable avian influenza (HPNAI) low pathogenicity notifiable avian influenza (LPNAI)

13 Avian Influenza Terrestrial Code For the purposes of international trade, HPNAI vs LPNAI HPNAI viruses have an IVPI in 6-week-old chickens greater than 1.2 or, as an alternative, cause at least 75% mortality in 4-to 8- week-old chickens infected intravenously. H5 and H7 viruses which do not have an IVPI of greater than 1.2 or cause less than 75% mortality in an intravenous lethality test should be sequenced to determine whether multiple basic amino acids are present at the cleavage site of the haemagglutinin molecule (HA0); if the amino acid motif is similar to that observed for other HPNAI isolates, the isolate being tested should be considered as HPNAI; LPNAI are all influenza A viruses of H5 and H7 subtype that are not HPNAI viruses.

14 What Is Poultry? Poultry is defined as all domesticated birds, including backyard poultry, used for the production of meat or eggs for consumption, for the production of other commercial products, for restocking supplies of game, or for breeding these categories of birds, as well as fighting cocks used for any purpose. Birds that are kept in captivity for any reason other than those reasons referred to in the preceding paragraph, including those that are kept for shows, races, exhibitions, competitions or for breeding or selling these categories of birds as well as pet birds, are not considered to be poultry.

15 Avian Influenza Terrestrial Manual Diagnostic tests 1) Identification of the agent (the prescribed test for international trade) 2) Assessment of pathogenicity 3) Serological tests 1) Agar gel immunodiffusion 2) Haemagglutination and haemagglutination inhibition tests 4) Antigen capture and molecular techniques 1) Antigen detection 2) Direct RNA detection Safe, effective, potent vaccine development, DIVA strategy, and post-vaccination monitoring

16 OIE Communications on Pandemic (H1N1) 2009

17 Laboratory Confirmed Pandemic (H1N1) 2009 Cases among Humans, by Date Reported to WHO Number of cases Outbreak of respiratory illness, Mexico 2 cases new A/H1N1, USA; 1 case atypical pneumonia, Mexico Mexico and USA cases = same strain April Date Reported to WHO May As of 22 May 2009

18 Number of cases Laboratory Confirmed Pandemic (H1N1) 2009 Cases among Humans, by Date Reported to WHO April Pandemic Phase 4 29 April Pandemic Phase 5 July 6 Testing Changes June 11, Pandemic Phase April May June July As of 6 July 2009

19 April 27 A/H1N1 influenza like human illness Not justified to name this human disease swine influenza Now called Pandemic (H1N1) 2009

20 Background Influenza A in Swine Respiratory illness described in pigs in 1918 believed to be the first occurrence of influenza in swine Classical swine influenza Swine influenza virus first isolated in 1930 as H1N1 Swine influenza endemic in many pig populations Pigs can be infected with different influenza viruses - reassortant strains Currently - various avian-like, reassortant, or triple reassortant influenza viruses circulating among swine populations Swine influenza is not an OIE listed disease

21 Why Classical Swine Influenza Is Not an OIE Listed Disease It does not meet the criteria outline in the Terrestrial Code (Chapter 1.2) of the Terrestrial Code. While swine influenza is capable of rapidly spreading within a herd, it is predominantly a production diseases with very low mortality. Human infection with the known swine influenza viruses has been an uncommonly described event and is clinically similar to seasonal influenza. Note Occurrence of pandemic (H1N1) 2009 in pigs is currently reportable to the OIE under the qualification of an emerging disease

22 OIE Statements Related to Pandemic (H1N1) 2009 A/H1N1 influenza like human illness in Mexico and the USA: OIE statement (27-Apr) OIE position on safety of international trade of pigs and products of pig origin (28-Apr) The OIE strongly counsels against the culling of pigs (30-Apr) Joint FAO/WHO/OIE Statement on influenza A(H1N1) and the safety of pork (30-Apr, reissued 7-May)

23 First report of Pandemic (H1N1) 2009 Virus in Swine 2-May: One swine herd in tested positive for influenza A H1N1 virus, later confirmed as pandemic (H1N1) 2009 strain Based on available epidemiologic information - it is believed that the pigs were exposed to the virus from a human with influenza-like symptoms Immediate quarantine of herd and notification by Canada to OIE as an Emerging Disease

24 OIE Statements Related to Pandemic (H1N1) 2009 OIE comments on the findings of A/H1N1 in pigs in Canada (4-May) OIE reaction to trade restrictions imposed following transmission of virus A/H1N1 from human to pigs (7-May) The OIE advocates implementing international standards for humane killing of animals for disease prevention purposes (20-May) Novel influenza A/H1N1 pandemic: the OIE maintains its recommendations to animal health authorities worldwide (11-June)

25 13 July: Pandemic H1N1 2009

26 OFFLU OIE-FAO Network of Expertise on Animal Influenza Established initially as the joint OIE-FAO network of expertise on avian influenza in 2005 to exchange scientific data and biological materials (including virus strains) within the network, to analyse such data, and to share such information with the wider scientific community. to offer technical advice and veterinary expertise to Member Countries to assist in the prevention, diagnosis, surveillance and control of avian influenza to collaborate with the WHO influenza network on issues relating to the animal-human interface, including early preparation of human vaccine to highlight avian influenza research needs, promote their development and ensure co-ordination.

27 OFFLU OFFLU strengthens links within our animal health network and collaborates with the existing WHO influenza network on all matters relevant to public health Expanded mandate to animal influenza in response to pandemic (H1N1) 2009 Drawing upon existing swine influenza expertise Incorporating new swine influenza expertise

28 OFFLU Actions in Response to Emergence of Pandemic (H1N1) 2009 Technical consultations human animal interface aspects of the current influenza A (H1N1) situation (WHO-OFFLU) laboratory diagnosis of new A/H1N1 in swine (OFFLU-WHO) proposed origin of novel influenza A H1N1 virus (WHO-OFFLU) surveillance issues around new influenza A/H1N1 and the human animal interface (OFFLU-WHO)

29

30 Remaining Issues Regarding Pandemic (H1N1) 2009 Strain for OIE It is likely that the circulation of this virus among humans lead to more pig infections and/or illness It appears that infection of pigs with this new virus causes disease similar to classical swine influenza Can we prevent this new influenza from becoming established in the pig population? Do existing pig SIV vaccines provide cross-protection against this new strain? What may be the implications for disease reporting?

31 Thank you for your attention Organisation Mondiale de la Santé Animale World Organisation for Animal Health Organización Mundial de Sanidad Animal 12 rue de Prony, Paris, France - oie@oie.int