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Mexico - 2 new outbreaks of highly pathogenic avian influenza H7N3 in backyard birds (OIE, April 08, 2015)
Mexico - 2 new outbreaks of highly pathogenic avian influenza H7N3 in backyard birds (OIE, April 08, 2015)
Highly pathogenic avian influenza,
Mexico
Information received on 09/04/2015 from Dr Joaqu?n Braulio Delgadillo ?lvarez, 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, Ministerio de Agricultura, Ganader?a, Desarrollo rural, Pesca y Alimentaci?n, 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
Tehuac?n, 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.
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