Mexico - 2 new outbreaks of highly pathogenic avian influenza H7N3 in backyard birds (OIE, April 08, 2015)

[Pathfinder]

Highly pathogenic avian influenza, Mexico

Information received on 09/04/2015 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 09/03/2015 Date of confirmation of the event 09/03/2015 Report date 08/04/2015 Date submitted to OIE 09/04/2015 Reason for notification Reoccurrence of a listed disease Date of previous occurrence 09/2014 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 (2)

Outbreak 1 Santiago Yaitepec, OAXACA Date of start of the outbreak 09/03/2015 Outbreak status Resolved (27/03/2015) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Destroyed Slaughtered Birds 200 90 90 110 0

Outbreak 2 Tehuacán, PUEBLA Date of start of the outbreak 09/03/2015 Outbreak status Resolved (27/03/2015) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Destroyed Slaughtered Birds 324 49 4 320 0

Summary of outbreaks Total outbreaks: 2 Total animals affected Species Susceptible Cases Deaths Destroyed Slaughtered Birds 524 139 94 430 0 Outbreak statistics Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost* Birds 26.53% 17.94% 67.63% 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 Following the notification by the owners of an increase in sudden death in birds at two backyards located in the States of Oaxaca and of Puebla, animals showing clinical signs suggestive of avian influenza were identified in both outbreaks. The official veterinary services launched the necessary epidemiological investigation and the presence of highly pathogenic avian influenza virus subtype H7N3 was confirmed. Control measures implemented immediately are, among others: quarantine, movement restrictions, stamping out and sampling in the focal and perifocal areas. Both outbreaks were confirmed as positive for avian influenza on 9 March and later by determining the intravenous pathogenicity index. So far, no epidemiological link has been identified between them.

Control measures Measures applied Stamping out Quarantine Movement control inside the country Screening Vaccination prohibited No treatment of affected animals Measures to be applied No other measures

Diagnostic test results Laboratory name and type Species Test Test date Result Level 3 Biosecurity Laboratory, SENASICA (National laboratory) Birds virus isolation 09/03/2015 Positive

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

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http://www.oie.int/wahis_2/public/wa...reportid=17489