Iceland - 1 new outbreak of Infectious bursal disease (Gumboro disease) in birds in farm, H?lavellir, Rang?rvalla (OIE, September 19, 2019)

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Infectious bursal disease (Gumboro disease), Iceland

Information received on 20/09/2019 from Dr Sigurborg Da?ad?ttir, Chief Veterinary Officer, Icelandic Food and Veterinary Authority, Ministry of Industries and Innovation, Selfoss, Iceland

Summary Report type Immediate notification Date of start of the event 19/07/2019 Date of confirmation of the event 09/09/2019 Report date 19/09/2019 Date submitted to OIE 20/09/2019 Reason for notification Recurrence of a listed disease Date of previous occurrence 01/01/1998 Manifestation of disease Clinical disease Causal agent Infectious bursal disease virus Serotype Pending Nature of diagnosis Clinical, Laboratory (basic), Laboratory (advanced), Necropsy This event pertains to the whole country

New outbreaks (1)

Outbreak 1 H?lavellir, Rang?rvalla Date of start of the outbreak 19/07/2019 Outbreak status Resolved (19/09/2019) Epidemiological unit Farm Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Birds 47850 11830 10292 1538 36020

Summary of outbreaks Total outbreaks: 1 Total animals affected Species Susceptible Cases Deaths Killed and disposed of Slaughtered Birds 47850 11830 10292 1538 36020 Outbreak statistics Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost* Birds 24.72% 21.51% 87.00% 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 In late July, the Icelandic Food and Veterinary Authority (MAST) was notified about an increase in daily mortality (0.5%) in 23 days old broilers in the oldest flock on a broiler farm with four units. Subsequently, the other flocks on the same farm also got affected. The birds were diagnosed with both Viral inclusion body hepatitis (IBH) and Infectious bursal disease (IBD). Post mortem examination revealed hepatitis with eosinophilic intranuclear inclusion bodies and an extensive lymphoid depletion in lymphoid organs, especially in the bursa of Fabricius. Attempts to verify adenovirus as the cause of hepatitis have been unsuccessful. Serology for IBD was positive and the presence of IBDV was confirmed with PCR. Genotyping is pending. Infectious bursal disease (IBD, Gumboro disease) has not been detected in Iceland since 1998 and vaccination against the disease is not practiced. Birds with clinical symptoms either died or were humanely killed. All carcasses were securely disposed of. The remaining birds were slaughtered under the strict supervision of veterinary officers. Intensive cleaning and disinfection of the premises have been carried out. Certain measures are planned to be applied as an attempt to eradicate the virus from the affected premises such as prolonged down time of the rearing units for a few months and temporary vaccination of the parent flocks and the broilers.

Control measures Measures applied Movement control inside the country Traceability Quarantine Official destruction of animal products Official disposal of carcasses, by-products and waste Stamping out Disinfection Slaughter Vaccination permitted (if a vaccine exists) No treatment of affected animals Measures to be applied Surveillance outside containment and/or protection zone Surveillance within containment and/or protection zone

Diagnostic test results Laboratory name and type Species Test Test date Result National Veterinary Institute SVA, Sweden (Foreign laboratory) Birds antibody detection ELISA 20/08/2019 Positive GD Animal Health, Netherlands (Private Laboratory) Birds polymerase chain reaction (PCR) 09/09/2019 Positive

Future Reporting The event is continuing. Weekly follow-up reports will be submitted.

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https://www.oie.int/wahis_2/public/wahid.php/Reviewreport/Review?page_refer=MapFullEventReport&reportid=31829