Highly pathogenic avian influenza, South Africa (OIE, May 6 2011): H5N2, four new poultry outbreaks

[Giuseppe]

[Source: OIE, full text: (LINK). Edited.]

Highly pathogenic avian influenza, South Africa


Information received on 06/05/2011 from Dr Bothle Michael Modisane, Chief Director Partnerships, Department of Agriculture, Forestry and Fisheries, Food Safety and Biosecurity, PRETORIA, South Africa

• Summary
  • Report type Follow-up report No. 1
  • Start date 01/02/2011
  • Date of first confirmation of the event 16/03/2011
  • Report date 06/05/2011
  • Date submitted to OIE 06/05/2011
  • Reason for notification Reoccurrence of a listed disease
  • Date of previous occurrence 07/2006
  • Manifestation of disease Clinical disease
  • Causal agent Highly pathogenic avian influenza virus
  • Serotype H5N2
  • Nature of diagnosis Laboratory (advanced)
  • This event pertains to the whole country
  • Related reports
    • Immediate notification (11/04/2011)
    • Follow-up report No. 1 (06/05/2011)
• New outbreaks
  • Outbreak 1 (AI_WCP2011_07) AI_WCP2011_07, Oudtshoorn, WESTERN CAPE PROVINCE
    • Date of start of the outbreak 25/03/2011
    • Outbreak status Continuing (or date resolved not provided)
    • Epidemiological unit Farm
    • Affected animals: Species ? Susceptible ? Cases ? Deaths ? Destroyed ? Slaughtered
      • Birds ? 1217 ? 15 ? 0 ? 0 ? 0
      • Affected Population Positive on PCR. Post-mortem signs seen.
  • Outbreak 2 (AI_WCP2011_09) AI_WCP2011_09, Oudtshoorn, WESTERN CAPE PROVINCE
    • Date of start of the outbreak 14/04/2011
    • Outbreak status Continuing (or date resolved not provided)
    • Epidemiological unit Farm
    • Affected animals: Species ? Susceptible ? Cases ? Deaths ? Destroyed ? Slaughtered
      • Birds ? 553 - ? - 0 ? 0 ? 0
      • Affected Population No clinical signs seen. Positive on serology, negative on PCR.
  • Outbreak 3 (AI_WCP2011_06) AI_WCP2011_06, Oudtshoorn, WESTERN CAPE PROVINCE
    • Date of start of the outbreak 25/03/2011
    • Outbreak status Continuing (or date resolved not provided)
    • Epidemiological unit Farm
    • Affected animals: Species ? Susceptible ? Cases ? Deaths ? Destroyed ? Slaughtered
      • Birds ? 307 ? 30 ? 0 ? 0 ? 0
      • Affected Population No clinical signs seen. PCR positive.
  • Outbreak 4 (AI_WCP2011_08) AI_WCP2011_08, Oudtshoorn, WESTERN CAPE PROVINCE
    • Date of start of the outbreak 25/03/2011
    • Outbreak status Continuing (or date resolved not provided)
    • Epidemiological unit Farm
    • Affected animals: Species ? Susceptible ? Cases ? Deaths ? Destroyed ? Slaughtered
      • Birds ? 337 ? 5 ? 0 ? 0 ? 0
      • Affected Population Positive on PCR. No clinical signs seen.
• Summary of outbreaks
  • Total outbreaks: 4
  • Total animals affected: Species ? Susceptible ? Cases ? Deaths ? Destroyed ? Slaughtered
    • Birds ? 2414 - 50 ** ? 0 ? 0 ? 0
  • Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
    • Birds ? ** - 0.00% ? ** - 0.00%
    • * 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
  • Commercial ostrich farms.
  • Farms tested positive on serology during routine surveillance, but tested negative on PCR and no virus could be found.
  • Diagnosis only confirmed after several follow-up PCR tests.
  • South Africa only reports outbreaks on confirmation on PCR tests.
  • Initially no clinical signs or mortalities were seen.
• Control measures
  • Measures applied
    • Quarantine
    • Screening
    • Vaccination prohibited
    • No treatment of affected animals
  • Measures to be applied
    • Stamping out
• Future Reporting
  • The event is continuing. Weekly follow-up reports will be submitted.

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