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2019-8-25 23:07:22


OIE: Highly pathogenic avian influenza, Mexico
submited by kickingbird at Jul, 30, 2019 9:13 AM from OIE

Summary
Report type Follow-up report No. 7
Date of start of the event 06/03/2019
Date of confirmation of the event 10/03/2019
Report date 26/07/2019
Date submitted to OIE 27/07/2019
Reason for notification Recurrence of a listed disease
Date of previous occurrence 18/04/2018
Manifestation of disease Clinical disease
Causal agent Highly pathogenic avian influneza virus
Serotype H7N3
Nature of diagnosis Clinical, Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (01/04/2019)
Follow-up report No. 1 (16/04/2019)
Follow-up report No. 2 (26/04/2019)
Follow-up report No. 3 (17/05/2019)
Follow-up report No. 4 (04/06/2019)
Follow-up report No. 5 (19/06/2019)
Follow-up report No. 6 (08/07/2019)
Follow-up report No. 7 (26/07/2019)
New outbreaks (4)
Outbreak 1 Coacoatzintla, Veracruz
Date of start of the outbreak 29/06/2019
Outbreak status Resolved (02/07/2019)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 25 13 3 22 0
Affected population Backyard with 25 birds detected following a reported high mortality and clinical signs suggesting highly pathogenic avian influenza (cyanosis, edema and swelling on red comb and wattles and sudden death).
Outbreak 2 Col髇, Queretaro
Date of start of the outbreak 03/07/2019
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 174163 10 0 0 0
Affected population As part of the epidemiological surveillance, samples of tracheal swabs were collected from animals not showing clinical signs in a fattening farm; the virus was isolated.
Outbreak 3 Dolores Hidalgo, Guanajuato
Date of start of the outbreak 10/07/2019
Outbreak status Resolved (13/07/2019)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 20 5 4 16 0
Affected population Backyard with 20 birds detected following a reported high mortality and clinical signs suggesting highly pathogenic avian influenza (cyanosis, edema and swelling on red comb and wattles and sudden death).
Outbreak 4 Pedro Escobedo, Queretaro
Date of start of the outbreak 11/07/2019
Outbreak status Resolved (18/07/2019)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 21644 10000 4275 17369 0
Affected population Light-breeder farm with 21,644 birds, detected following a reported high mortality in birds, with clinical signs pathognomonic of highly pathogenic avian influenza (cyanosis, edema and swelling of red comb and wattles and sudden death).
Summary of outbreaks Total outbreaks: 4
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 195852 10028 4282 17407 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Birds 5.12% 2.19% 42.70% 11.07%
*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 As a result of epidemiological surveillance, an outbreak was identified in a fattening farm in the municipality of Col髇, State of Quer閠aro, in which the birds did not show clinical signs. In addition, two outbreaks in backyard premises, located in the states of Veracruz and Guanajuato, and another outbreak in a production of light breeders with clinical signs suggestive of highly pathogenic avian influenza (cyanosis, edema and swelling on the red comb and wattles and sudden death) were reported. In all four outbreaks, virus isolation was achieved and quarantine was implemented. The culling of all birds, and the disposal of carcasses, products and waste were completed in three of the outbreaks reported, while they are still underway for the outbreak in the municipality of Col髇, Quer閠aro. IPIV titles were obtained for outbreaks in Santa Cruz de Juventino Rosas, Guanajuato (2.41); Coacoatzintla, Veracruz (2.25) and Col髇, Quer閠aro (2.29). The States of Quer閠aro, Veracruz and Guanajuato have a sanitary condition with low prevalence and the vaccine against the H7N3 avian influenza virus is applied, following prior authorization from SENASICA.
Control measures
Measures applied
  • Movement control inside the country
  • Surveillance outside containment and/or protection zone
  • Surveillance within containment and/or protection zone
  • Quarantine
  • Official disposal of carcasses, by-products and waste
  • Vaccination permitted (if a vaccine exists)
  • No treatment of affected animals
Measures to be applied
  • Stamping out
  • Disinfection
  • Slaughter
  • Ante and post-mortem inspections
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
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