OIE: Highly pathogenic avian influenza(H7N3), Mexico
submited by kickingbird at Mar, 13, 2018 13:27 PM from OIE
Information received on 09/03/2018 from MVZ Joaquín Braulio Delgadillo álvarez, Director General de Salud Animal, Servicio Nacional de Sanidad, Inocuidad y Calidad Agroalimentaria (SENASICA) Secretaría de Agricultura, Ganadería, Desarrollo Rural, Pesca y Alimentación, Ministerio de Agricultura, Ganadería, Desarrollo Rural, Pesca y Alimentación, México, Mexico
Summary
| Report type |
Immediate notification |
| Date of start of the event |
12/02/2018 |
| Date of confirmation of the event |
03/03/2018 |
| Report date |
09/03/2018 |
| Date submitted to OIE |
10/03/2018 |
| Reason for notification |
Recurrence of a listed disease |
| Date of previous occurrence |
31/05/2017 |
| Manifestation of disease |
Clinical disease |
| Causal agent |
Highly pathogenic avian influenza virus |
| Serotype |
H7N3 |
| Nature of diagnosis |
Clinical, Laboratory (advanced) |
| This event pertains to |
a defined zone within the country |
New outbreaks
| Summary of outbreaks |
Total outbreaks: 2 |
| Outbreak Location |
- GUANAJUATO ( San Felipe, San Felipe )
- QUERETARO ( Cadereyta de Montes, Cadereyta de Montes )
|
| Total animals affected |
| Species |
Susceptible |
Cases |
Deaths |
Killed and disposed of |
Slaughtered |
| Birds |
1926 |
1387 |
1387 |
539 |
0 | |
| Outbreak statistics |
| Species |
Apparent morbidity rate |
Apparent mortality rate |
Apparent case fatality rate |
Proportion susceptible animals lost* |
| Birds |
72.01% |
72.01% |
100.00% |
100.00% |
* Removed from the susceptible population through death, destruction and/or slaughter; |
Epidemiology
| Source of the outbreak(s) or origin of infection |
- Introduction of new live animals
|
| Epidemiological comments |
A farm was detected in Guanajuato within the framework of the permanent National program for active epidemiological surveillance. It initially had 1,400 Rhodes Island Red chickens, before the introduction of 500 white chickens towards the end of the laying phase, supposedly coming from a farm in Jalisco where vaccination is applied. This was verified through serology on 30 sera with two titers of 1:256, four titers of 1:512 and 24 titers of 1:1024. This introduction is considered to be the source of infection of the susceptible birds. Isolation in Querétaro was obtained after the reporting by an authorized laboratory, which provided the official laboratory with the samples.
As difficulties were faced during typing of the virus, several diagnostic assays were performed until confirmation. Isolated viruses in Guanajuato and Querétaro presented an IVIP of 2.84 and 2.86, respectively.
In both cases, measures to control the epidemic were applied, including quarantine of the premises and killing of the birds. Pre-emptively, a focal zone and a perifocal zone of three and ten kilometers respectively were implemented, where the absence of the disease has been verified. The National veterinary services will keep the epidemiological surveillance going and inform the OIE about any evolution. |
Control measures
| Measures applied |
- Movement control inside the country
- Screening
- Quarantine
- Official disposal of carcasses, by-products and waste
- Stamping out
- Zoning
- Disinfection
- Vaccination prohibited
- No treatment of affected animals
|
| Measures to be applied |
|
Diagnostic test results
| Laboratory name and type |
SENASICA level-3 biosecurity laboratory ( National laboratory ) |
| Tests and results |
| Species |
Test |
Test date |
Result |
| Birds |
haemagglutination inhibition test (HIT) |
18/02/2018 |
Positive |
| Birds |
intravenous pathogenicity index (IVPI) test |
19/02/2018 |
Positive |
| Birds |
neuraminidase inhibition assay |
03/03/2018 |
Positive |
| Birds |
virus isolation |
19/02/2018 |
Positive |
| Birds |
virus sequencing |
23/02/2018 |
Positive | |
Future Reporting
| The event is continuing. Weekly follow-up reports will be submitted. |
