OIE: Highly pathogenic avian influenza ,Mexico

Information received on 08/05/2015 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	28/04/2015
Date of confirmation of the event	07/05/2015
Report date	08/05/2015
Date submitted to OIE	08/05/2015
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: 1

Outbreak Location

CHIAPAS ( Tuxtla Gutierrez )

Total animals affected

Species	Susceptible	Cases	Deaths	Destroyed	Slaughtered
Plain chachalaca:Cracidae (Ortalis Vetula)		6	6	0	0
Clay-colored thrush:Turdidae (Turdus grayi)		2	2	0	0

Outbreak statistics

Species	Apparent morbidity rate	Apparent mortality rate	Apparent case fatality rate	Proportion susceptible animals lost*
Plain chachalaca:Cracidae (Ortalis Vetula)	**	**	100.00%	**
Clay-colored thrush:Turdidae (Turdus grayi)	**	**	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

Endemic wild birds were reported having been found dead in a nature reserve called “The Zapotal”; the reserve is in the State of Chiapas, consists of 100 hectares of semi-humid forest, with several species of sapotas, and shows a wide variety of native wildlife of this State. It has about 220 animal species in their natural environments and 154 species living freely in the reserve, of which 62 species of birds.
During the initial investigation, three highly pathogenic avian influenza virus of H7N3 subtype were isolated with an intravenous pathogenicity index of 2.91 and 2.99. A 10 km focal and perifocal zone was established and no evidence of infection was found in commercial poultry. Under the national epidemiological surveillance program, a state active epidemiological surveillance program is on-going for 100% of the commercial poultry and, through a statistical sample size, in backyard poultry, based on serological, virological and molecular testing; no evidence of infection was found in commercial poultry or in backyard poultry. The affected species are Ortalis vetula and Turdus grayi. The epidemiological investigation continues.

Control measures

Measures applied	Control of wildlife reservoirs 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

Level 3 Biosecurity Laboratory, SENASICA ( National laboratory )

Tests and results

Species

Test