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Highly pathogenic avian influenza H7N3, Mexico (OIE, December 13 2012): 2 New Outbreaks, Final Report

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  • Highly pathogenic avian influenza H7N3, Mexico (OIE, December 13 2012): 2 New Outbreaks, Final Report

    [Source: OIE, full page: (LINK). Edited.]


    Highly pathogenic avian influenza, Mexico


    Information received on 12/12/2012 from Dr Hugo Fragoso Sαnchez, Director general de salud animal, Servicio nacional de sanidad, inocuidad y calidad agroalimentaria (SENASICA), Secretarνa de Agricultura, ganaderνa,desarrollo rural, pesca y alimentaciσn (SAGARPA), Mexico, Mexico
    • Summary
      • Report type Follow-up report No. 8 (Final report)
      • Date of start of the event 13/06/2012
      • Date of pre-confirmation of the event 21/06/2012
      • Report date 12/12/2012
      • Date submitted to OIE 12/12/2012
      • Date event resolved 29/09/2012
      • Reason for notification Reoccurrence of a listed disease
      • Date of previous occurrence 06/1995
      • Manifestation of disease Clinical disease
      • Causal agent Highly pathogenic avian influenza virus
      • Serotype H7N3
      • Nature of diagnosis Laboratory (basic)
      • This event pertains to a defined zone within the country
      • Related reports
        • Immediate notification (21/06/2012)
        • Follow-up report No. 1 (25/06/2012)
        • Follow-up report No. 2 (02/07/2012)
        • Follow-up report No. 3 (10/07/2012)
        • Follow-up report No. 4 (16/07/2012)
        • Follow-up report No. 5 (24/07/2012)
        • Follow-up report No. 6 (02/08/2012)
        • Follow-up report No. 7 (17/09/2012)
        • Follow-up report No. 8 (12/12/2012)
    • New outbreaks (2)
      • Outbreak 1 ( 45) - Tepatitlan de Morelos, foco 45, Tepatitlan de Morelos, JALISCO
        • Date of start of the outbreak 06/08/2012
        • Outbreak status Resolved (07/08/2012)
        • Epidemiological unit Not applicable
        • Affected animals: Species – Susceptible – Cases – Deaths – Destroyed – Slaughtered
          • Common Grackle: Quiscalus quiscula(Icteridae) - … – 10 – 8 – 2 – 0
      • Outbreak 2 ( 46) - Tepatitlan de Morelos, foco 46, Tepatitlan de Morelos, JALISCO
        • Date of start of the outbreak 28/09/2012
        • Outbreak status Resolved (29/09/2012)
        • Epidemiological unit Not applicable
        • Affected animals: Species – Susceptible – Cases – Deaths – Destroyed – Slaughtered
          • Barn Swallow: Hirundo rustica(Hirundinidae) - … – 1 – 1 – 1 – 0
    • Summary of outbreaks
      • Total outbreaks: 2
      • Total animals affected: Species – Susceptible – Cases – Deaths – Destroyed – Slaughtered
        • Common Grackle: Quiscalus quiscula(Icteridae) - … – 10 – 8 – 2 – 0
        • Barn Swallow: Hirundo rustica(Hirundinidae) - … – 1 – 1 – 1 – 0
      • Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
        • Common Grackle: Quiscalus quiscula(Icteridae) – ** – ** - 80.00% – **
        • Barn Swallow: Hirundo rustica(Hirundinidae) – ** – ** - 100.00% – **
        • *Removed from the susceptible population through death, destruction and/or slaughter
        • **Not calculated because of missing information
    • Epidemiology
      • Source of the outbreak(s) or origin of infection
        • Unknown or inconclusive
    • Epidemiological comments
      • As part of the surveillance activities and the epidemiological investigation carried out in response to the H7N3 highly pathogenic avian influenza (HPAI) event occurred in Jalisco, the National Food Quality, Food Safety and Health Service (SENASICA) continues to take epidemiological surveillance actions.
      • So far, 730 production units (272 layer farms, 46 breeder farms and 202 backyard farms including fighting birds) have been sampled.
      • A total of 81,835 samples have been tested and 44 H7N3 HPAI isolates have been identified in commercial layer and breeder farms and two in wild birds.
      • During the depopulation activities in the poultry farms, 11.4 million birds have been slaughtered and destroyed and around 11 other million birds have been slaughtered as a pre-emptive measure as agreed by farmers in order to avoid the establishment and spread of the virus.
      • Therefore, compensation for the slaughter and disposal of around 22.4 million birds will be implemented.
      • In addition to the sampling carried out in Jalisco, surveillance activities continue at the national level in poultry and backyard farms.
      • It includes 182,429 serological and virological samples which are processed in the official laboratories.
      • As part of the measures to prevent, control and eradicate the virus, a temporary official vaccine programme of birds at risk began on 26 June 2012, through the production and application of an emulsified vaccine manufactured in Mexico by the official sector.
      • 165.9 million doses have been applied; these figures include booster vaccination.
      • A vaccine bank of 70 million doses is currently available.
      • 117 days have elapsed since the last virus isolation in commercial farms in Jalisco, which means a remission of 5.6 incubation periods for notifiable avian influenza virus.
      • Therefore, on 16 November 2012, the event of HPAI H7N3 having occurred last June has been eradicated and surveillance and epidemiological investigation of notifiable avian influenza will continue as provided in Chapter 10.4.28, 10.4.29 and 10.4.30 of the OIE Terrestrial Animal Health Code.
    • Control measures
      • Measures applied
        • Stamping out
        • Quarantine
        • Movement control inside the country
        • Screening
        • Zoning
        • Vaccination in response to the outbreak (s): Administrative division – Species - Total Vaccinated – Details
          • JALISCO – Birds – 165945000 - The 165,945,000 doses applied include booster vaccination
        • Disinfection of infected premises/establishment(s)
        • No treatment of affected animals
      • Measures to be applied
        • No other measures
    • Future Reporting
      • The event is resolved. No more reports will be submitted.
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