Information received on 10 August 2005 from Mr Jia Youling, Director General, Veterinary Bureau, Ministry of Agriculture, Beijing:
End of previous report period: 20 June 2005 (see Disease Information, 18 [25], 166, dated 24 June 2005).
End of this report period: 10 August 2005.
Precise identification of agent : highly pathogenic avian influenza (HPAI) type H5N1.
Date of first confirmation of the event: 10 August 2005.
Date of start of the event: 1 August 2005.
Clinical disease: yes.
Nature of diagnosis: clinical, post-mortem and laboratory.
Details of new outbreak:
| First administrative division | Lower administrative division | Type of epide-miolo-gical unit | Date of start of the outbreak | Spe-cies | Number of animals in the outbreak | ||||
| susceptible | cases | deaths | destroyed | slaugh-tered | |||||
| Tibet Autonomous Region | Lhasa | farm | 1 August 2005 | avi | 2,608 | 133 | 133 | 2,475 | 0 |
Description of affected population: breeding hens.
Diagnosis:
| Laboratories where diagnosis was made | Diagnostic tests used | Date | Results |
| General Station of Animal Epidemics Prevention and Surveillance, Tibet, Lhasa | haemagglutination inhibition (HI) test | 4 August 2005 | positive |
| National Avian Influenza Reference Laboratory, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences | RT-PCR(1) | 10 August 2005 | positive |
|
intravenous pathogenicity index |
positive (HPAI) | ||
Source of outbreak or origin of infection: unknown or inconclusive.
Control measures undertaken:
- stamping out;
- quarantine;
- movement control inside the country;
- screening;
- zoning;
- vaccination;
- disinfection of infected premises/establishment(s).
- dipping/spraying.
Vaccination in response to the outbreak:
| First administrative division | Species | Total number of vaccinated animals | Details of the vaccine |
| Tibet Autonomous Region | avi | ... | monovalent inactivated vaccine against subtype H5N2 |
Treatment of affected animals: no.
Vaccination prohibited: no.
(1) RT-PCR: reverse transcriptase - polymerase chain reaction