1/09/2013

Highly pathogenic avian influenza H7N3, Mexico (OIE, January 8 2013, edited)

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

Highly pathogenic avian influenza, Mexico

Information received on 08/01/2013 from Dr Hugo Fragoso Sánchez, Director general de salud animal, Servicio nacional de sanidad, inocuidad y calidad agroalimentaria (SENASICA), Secretaría de Agricultura, ganadería,desarrollo rural, pesca y alimentación (SAGARPA), Mexico, Mexico

  • Summary
    • Report type Immediate notification
    • Date of start of the event 03/01/2013
    • Date of pre-confirmation of the event 07/01/2013
    • Report date 08/01/2013
    • Date submitted to OIE 09/01/2013
    • Reason for notification First occurrence of a listed disease
    • Manifestation of disease Clinical disease
    • Causal agent Highly pathogenic avian influenza virus
    • Serotype H7N3
    • Nature of diagnosis Clinical, Laboratory (basic)
    • This event pertains to a defined zone within the country
  • New outbreaks
    • Summary of outbreaks
      • Total outbreaks: 2
      • Outbreak Location: AGUASCALIENTES ( San Francisco de los Romo, San Francisco de los Romo Aguascalientes, Aguascalientes )
        • Total animals affected -  Species -  Susceptible -  Cases -  Deaths -  Destroyed -   Slaughtered
          • Birds  -  284755  -  2990 **  -  740  -  0  -   284015
      • Outbreak statistics:  Species -  Apparent morbidity rate -  Apparent mortality rate -  Apparent case fatality rate -  Proportion susceptible animals lost*
        • Birds -  ** -  0.26% -  ** -   100.00%
        • * Removed from the susceptible population through death, destruction and/or slaughter;
  • Epidemiology
    • Source of the outbreak(s) or origin of infection
      • Unknown or inconclusive
  • Epidemiological comments
    • The last outbreak of highly pathogenic avian influenza serotype H7N3 occurred in September 2012 in the northeastern part of the State of Jalisco.
    • Following control and eradication measures, passive and active surveillance was strengthened and on 3 January 2013 SENASICA was informed of an increase in mortality and a decrease of egg production on a commercial layer farm in the State of Aguascalientes.
    • Timely notification from the farmer and surveillance activities allowed immediate depopulation of the two affected production units, reason why both outbreaks identified are closed.
    • The first outbreak had a population of 146,755 birds aged 21-80 weeks, of which 2,990 sick and 740 dead.
    • Clinical signs were conjunctivitis, edema, cyanosis and palpebral, comb and chin swelling as well as opisthotonos and sudden death.
    • Additionally, during post-mortem inspections, hemorrhages were identified in trachea, lungs and tonsils.
    • Control measures included vaccination of laying and breeding hens within the zone around the outbreaks and the buffer zone and the strengthening of biosecurity and control of poultry goods movements.
    • The second outbreak was detected during active surveillance conducted in the State of Aguascalientes and the virus was isolated in another commercial layer farm with a population of 138,000 birds over 81 weeks old, which was also depopulated.
    • In both outbreaks, cleaning and disinfection of facilities and equipment as well as destruction of hen manure have been carried out.
    • After depopulation, sentinel birds will be introduced in order to confirm the absence of infection and viral circulation.
    • Active and passive surveillance continues at national level. Epidemiological investigation is on-going.
  • Control measures
    • Measures applied
      • Stamping out
      • Quarantine
      • Movement control inside the country
      • Screening
      • Zoning
      • Disinfection of infected premises/establishment(s)
      • Vaccination prohibited
      • No treatment of affected animals
    • Measures to be applied
      • No other measures
  • Diagnostic test results
    • Laboratory name and type -  Biosecurity Laboratory Level 3, Mexico-United States Commission for the Prevention of Foot and Mouth Disease and Other Exotic Diseases of Animals ( National laboratory )
      • Tests and results:  Species -  Test -  Test date -  Result
        • Birds -  virus isolation -  07/01/2013 -   Positive
  • Future Reporting
    • The event is continuing. Weekly follow-up reports will be submitted.

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