Low pathogenic avian influenza (poultry) H7, South Africa (OIE, August 30 2013): 1 New Outbreak

[Giuseppe]

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


Low pathogenic avian influenza (poultry) H7, South Africa


Information received on 30/08/2013 from Dr Bothle Michael Modisane, Chief Director , Department of Agriculture, Forestry and Fisheries, Animal Production and Health, PRETORIA, South Africa

• Summary
  • Report type Immediate notification
  • Date of start of the event 30/07/2013
  • Date of pre-confirmation of the event 01/08/2013
  • Report date 30/08/2013
  • Date submitted to OIE 30/08/2013
  • Reason for notification Reoccurrence of a listed disease
  • Date of previous occurrence 05/2012
  • Manifestation of disease Sub-clinical infection
  • Causal agent Low pathogenic avian influenza virus
  • Serotype H7
  • Nature of diagnosis Laboratory (advanced)
  • This event pertains to a defined zone within the country
• New outbreaks (1)
  • Outbreak 1 (LPNAI_Gau2013_001) LPNAI_Gau2013_001, City of Tshwane, GAUTENG
    • Date of start of the outbreak 30/07/2013
    • Outbreak status Continuing (or date resolved not provided)
    • Epidemiological unit Farm
    • Affected animals: Species ? Susceptible ? Cases ? Deaths ? Destroyed ? Slaughtered
      • Birds - 2000 ? 4 ? 0 ? 0 ? 0
      • Affected population Captive cattle egrets, umbrella cockatoo and eagle owl
• Summary of outbreaks
  • Total outbreaks: 1
    • Total animals affected: Species ? Susceptible ? Cases ? Deaths ? Destroyed ? Slaughtered
      • Birds ? 2000 ? 4 ? 0 ? 0 ? 0
    • Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
      • Birds - 0.20% - 0.00% - 0.00% - 0.00%
      • *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
  • This outbreak is more than 1,000 km away from any other reported H7N1 or H7N7 outbreaks and occurred in species other than ostriches.
  • There is no evidence to link this outbreak to previous outbreaks.
  • This outbreak occurred in indigenous wild birds and an exotic parrot kept in captivity.
  • The birds were tested for planned export.
  • They tested positive on RT-PCR for H7.
  • The samples did not render enough material to allow sequencing or virus isolation and the N-type could not be determined.
  • It is highly unlikely that further information on the N-type will be obtained.
  • For this reason, the veterinary services decided to report it as a new event.
  • Note by the OIE Animal Health Information Department:
    • H5 and H7 avian influenza in its low pathogenic form in poultry is a notifiable disease as per Chapter 10.4. on avian influenza of the Terrestrial Animal Health Code (2012).
• Control measures
  • Measures applied
    • Quarantine
    • Screening
    • No vaccination
    • No treatment of affected animals
  • Measures to be applied
    • No other measures
• Diagnostic test results
  • Laboratory name and type ? Species ? Test - Test date ? Result
    • Agricultural Research Council - Onderstepoort Veterinary Institute (ARC ? OVI) (National laboratory) ? Birds - real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) - 01/08/2013 ? Positive
• Future Reporting
  • The event is continuing. Weekly follow-up reports will be submitted.

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