Highly pathogenic avian influenza H7N3, Mexico (OIE, January 9 2013): 1 New Outbreak, Aguascalientes

[Giuseppe]

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


Highly pathogenic avian influenza, Mexico


Information received on 08/01/2013 from Dr Hugo Fragoso S?nchez, Director general de salud animal, Servicio nacional de sanidad, inocuidad y calidad agroalimentaria (SENASICA), Secretar?a de Agricultura, ganader?a,desarrollo rural, pesca y alimentaci?n (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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