OIE: Highly pathogenic avian influenza ,Mexico

Information received on 18/02/2013 from Dr Joaquín Braulio Delgadillo álvarez, Director General de Salud Animal, Servicio Nacional de Sanidad, Inocuidad y Calidad Agroalimentaria (SENASICA) Secretaría de Agricultura, Ganadería, Desarrollo Rural, Pesca y Alimentación, Ministerio de Agricultura, Ganadería, Desarrollo rural, Pesca y Alimentación, Mexico, Mexico

Summary

Report type	Immediate notification
Date of start of the event	12/02/2013
Date of pre-confirmation of the event	17/02/2013
Report date	18/02/2013
Date submitted to OIE	19/02/2013
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	Laboratory (basic), Laboratory (advanced)
This event pertains to	a defined zone within the country

New outbreaks

Summary of outbreaks

Total outbreaks: 9

Outbreak Location

GUANAJUATO ( San Felipe, San Felipe Dolores Hidalgo, Dolores Hidalgo San Luis de La Paz, San Luis de La Paz Juventino Rosas, Juventino Rosas Dolores Hidalgo, Dolores Hidalgo Dolores Hidalgo, Dolores Hidalgo Dolores Hidalgo, Dolores Hidalgo Dolores Hidalgo, Dolores Hidalgo Dolores Hidalgo, Dolores Hidalgo )

Total animals affected

Species	Susceptible	Cases	Deaths	Destroyed	Slaughtered
Birds	647742	53553	34889	612853	0

Outbreak statistics

Species	Apparent morbidity rate	Apparent mortality rate	Apparent case fatality rate	Proportion susceptible animals lost*
Birds	8.27%	5.39%	65.15%	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

On 13 February 2013, an increase of mortality in breeding hens in the State of Guanajuato was reported to SENASICA. The event apparently began suddenly on 12 February 2013; later, the following clinical signs were observed: edema, cyanosis and palpebral, comb and chin swelling, diarrhea, dyspnea, shell-less or rough-shelled eggs and sudden death. SENASICA immediately went to the affected farms and to those located in the outbreak area and around the outbreaks in order to start analyzing the situation. Virological and serological samples were taken and sent to both the regional and the national laboratory of SENASICA.
On 17 February 2013, positive results were obtained by viral isolation of the highly pathogenic notifiable avian influenza virus, H7N3 subtype.
During the epidemiological investigation, nine outbreaks of highly pathogenic H7N3 avian influenza were identified in the State of Guanajuato. The outbreaks occurred in seven breeder farms and in two commercial layer farms. The affected population was 647,742 birds, of which 34,889 died and 53,553 were ill.
The affected breeder farms are located in the municipalities of San Felipe (1) and of Dolores Hidalgo (6), while commercial layer farms are in the municipalities of San Luis de La Paz (1) and of Juventino Rosas (1), all in the State of Guanajuato.
In addition to the depopulation activities, a preventive vaccination was launched in breeder and layer farms in the State of Guanajuato. The epidemiological investigation is ongoing and the first results suggest the introduction of the virus through fomites and biosecurity failures.

Control measures

Measures applied	Stamping out Quarantine Movement control inside the country Screening Zoning Vaccination in response to the outbreak (s) Disinfection of infected premises/establishment(s) No treatment of affected animals
Measures to be applied	No other measures

Diagnostic test results

Laboratory name and type

Biosecurity Laboratory Level 3, SENASICA ( National laboratory )

Tests and results

Species	Test	Test date	Result
Birds	virus isolation	17/02/2013	Positive

Future Reporting

The event is continuing. Weekly follow-up reports will be submitted.