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Mexico - 2 new outbreaks of highly pathogenic avian influenza H7N3 in backyard birds, Guanajuato, Queretaro (OIE, March 9, 2018)
Mexico - 2 new outbreaks of highly pathogenic avian influenza H7N3 in backyard birds, Guanajuato, Queretaro (OIE, March 9, 2018)
Highly pathogenic avian influenza,
Mexico
Information received on 10/03/2018 from MVZ 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, M?xico, Mexico
Summary
Report type
Immediate notification
Date of start of the event
12/02/2018
Date of confirmation of the event
03/03/2018
Report date
09/03/2018
Date submitted to OIE
10/03/2018
Reason for notification
Recurrence of a listed disease
Date of previous occurrence
31/05/2017
Manifestation of disease
Clinical disease
Causal agent
Highly pathogenic avian influenza virus
Serotype
H7N3
Nature of diagnosis
Clinical, Laboratory (advanced)
This event pertains to
a defined zone within the country
New outbreaks (2)
Outbreak 1
San Felipe, San Felipe, GUANAJUATO
Date of start of the outbreak
12/02/2018
Outbreak status
Resolved (20/02/2018)
Epidemiological unit
Backyard
Affected animals
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
1900
1380
1380
520
0
Affected population
Approximately-80-weeks-old Rhode Island Red chickens and white chickens in a rural farm.
Outbreak 2
Cadereyta de Montes, Cadereyta de Montes, QUERETARO
Date of start of the outbreak
22/02/2018
Outbreak status
Resolved (23/02/2018)
Epidemiological unit
Backyard
Affected animals
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
26
7
7
19
0
Affected population
Backyard birds with clinical signs: conjunctivitis, watery diarrhea and sudden death.
Summary of outbreaks
Total outbreaks: 2
Total animals affected
Species
Susceptible
Cases
Deaths
Killed and disposed of
Slaughtered
Birds
1926
1387
1387
539
0
Outbreak statistics
Species
Apparent morbidity rate
Apparent mortality rate
Apparent case fatality rate
Proportion susceptible animals lost*
Birds
72.01%
72.01%
100.00%
100.00%
*Removed from the susceptible population through death, destruction and/or slaughter
Epidemiology
Source of the outbreak(s) or origin of infection
Introduction of new live animals
Epidemiological comments
A farm was detected in Guanajuato within the framework of the permanent National program for active epidemiological surveillance. It initially had 1,400 Rhodes Island Red chickens, before the introduction of 500 white chickens towards the end of the laying phase, supposedly coming from a farm in Jalisco where vaccination is applied. This was verified through serology on 30 sera with two titers of 1:256, four titers of 1:512 and 24 titers of 1:1024. This introduction is considered to be the source of infection of the susceptible birds. Isolation in Quer?taro was obtained after the reporting by an authorized laboratory, which provided the official laboratory with the samples. As difficulties were faced during typing of the virus, several diagnostic assays were performed until confirmation. Isolated viruses in Guanajuato and Quer?taro presented an IVIP of 2.84 and 2.86, respectively. In both cases, measures to control the epidemic were applied, including quarantine of the premises and killing of the birds. Pre-emptively, a focal zone and a perifocal zone of three and ten kilometers respectively were implemented, where the absence of the disease has been verified. The National veterinary services will keep the epidemiological surveillance going and inform the OIE about any evolution.
Control measures
Measures applied
Movement control inside the country
Screening
Quarantine
Official disposal of carcasses, by-products and waste
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