Low pathogenic avian influenza H7 (poultry), Mexico (OIE, June 22 2012): 1st Occurence of the disease

[Giuseppe]

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


Low pathogenic avian influenza (poultry), Mexico


Information received on 22/06/2012 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
  • Start date 13/06/2012
  • Date of first confirmation of the event 21/06/2012
  • Report date 21/06/2012
  • Date submitted to OIE 22/06/2012
  • Reason for notification First occurrence of a listed disease
  • Manifestation of disease Clinical disease
  • Causal agent Low pathogenic avian influenza virus
  • Serotype H7
  • Nature of diagnosis Laboratory (basic)
  • This event pertains to a defined zone within the country
• New outbreaks
  • Summary of outbreaks
    • Total outbreaks: 3
      • Location(s) - JALISCO (Tepatitlan de Morelos, Pegueros; Acatic, Tierras Coloradas; Tepatitlan de Morelos, Valle de Guadalupe)
        • Total animals affected: Species ? Susceptible ? Cases ? Deaths ? Destroyed ? Slaughtered
          • Birds ? 1042039 ? 587160 ? 211242 ? 60000 ? 0
  • Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
    • Birds - 56.35% - 20.27% - 35.98% ? **
    • * 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
  • An epidemiological investigation is being conducted.
  • The event includes 3 commercial layer farms.
  • The birds showed: gasping, depression, lethargy, drooping wings, prostration, fever and death.
  • The birds are 32, 72, 75, 84 and 94 weeks old.
  • Isolates are being tested by intravenous pathogenicity test to determine their pathogenicity and by gene sequencing.
  • Epidemiological investigation is on-going to establish the extent of the problem and the source of infection in order to implement additional measures to rapidly resolve the problem.
  • Additional sampling is underway to identify the possible presence of other pathogens involved in the outbreaks.
  • Note by the OIE Animal Health Information Department:
    • H5 and H7 avian influenza in its low pathogenic form in poultry is a notifiable disease as per Chapter 10.4. on avian influenza of the Terrestrial Animal Health Code (2011).
• Control measures
  • Measures applied
    • Quarantine
    • Movement control inside the country
    • Screening
    • Zoning
    • Disinfection of infected premises/establishment(s)
    • Modified stamping out
    • No vaccination
    • No treatment of affected animals
  • Measures to be applied
    • Stamping out
• Diagnostic test results
  • Laboratory name and type Biosecurity Laboratory Level 3 (National laboratory)
    • Tests and results: Species ? Test - Test date ? Result
      • Birds - virus isolation - 21/06/2012 ? Positive
• Future Reporting
  • The event is continuing. Weekly follow-up reports will be submitted.

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[Gert van der Hoek]

Re: Low pathogenic avian influenza H7 (poultry), Mexico (OIE, June 22 2012): 1st Occurence of the disease

Update OIE:

Information received on 26/06/2012 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

Causal agent Highly pathogenic avian influenza virus

Serotype H7N3

The epidemiological investigation is on-going to identify the source of the infection and the risk factors. The isolates were tested by intravenous pathogenicity test and correspond to a highly pathogenic avian influenza virus subtype H7N3. A full gene sequencing of the virus is on-going.

Following this diagnosis, about 60 poultry farms within the area around the outbreaks have been sampled in order to determine their health status. The samples are being tested by the official national reference laboratory. Preventive quarantine measures will be established throughout the poultry region at risk, which is estimated at around 500 production units.

Currently, the following control measures are being applied: official movement control measures on poultry and poultry products inside and outside the area around the outbreaks; official sampling in industrial poultry farms, backyard poultry farms and poultry markets; assessment of biosecurity and good livestock practices; depopulation of affected farms in order to introduce later sentinel animals.

OIE