EQUINE VIRAL ARTERITIS - ARGENTINA (02): (BUENOS AIRES) OIE

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A ProMED-mail post

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International Society for Infectious Diseases


Date: 10 May 2010
Source: OIE, Paris [edited]



Equine viral arteritis, Argentina
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Information received on 7 May 2010 from Dr Jorge Nestor Amaya,
Presidente, Presidencia, SENASA, BUENOS AIRES, Argentina

Summary:
Report type: Immediate notification
Start date: 9 Mar 2010
Date of 1st confirmation of the event: 31 Mar 2010
Report date: 7 May 2010
Date submitted to OIE: 7 May 2010
Reason for notification: Reoccurrence of a listed disease
Date of previous occurrence: 2006
Manifestation of disease: Clinical disease
Causal agent: Equine arteritis virus
Nature of diagnosis: Clinical, Laboratory (advanced), Necropsy
This event pertains to: the whole country

New outbreaks:
Summary of outbreaks: Total outbreaks 8

(AVE 1): San Antonio de Areco, Villa Lia, San Antonio de Areco, BUENOS AIRES

Date of start of the outbreak: 9 Mar 2010
Outbreak status: Continuing (or date resolved not provided)
Epidemiological unit: Farm
Affected animals: Species (_equidae_) Susceptible (141) Cases (80)
Deaths (0) Destroyed (0) Slaughtered (0)
Affected Population: A farm with sport horses (jumping and races).
The 1st sign was abortions in mares that were with jumping mares
artificially inseminated (30 to 40 days before the abortions).
Animals from this farm went to other farms, where investigations are
on-going; in some of them, serologically positive animals have been
found. This is the index farm.

(AVE 2): Autonomous City of Buenos Aires, CAPITAL FEDERAL
Date of start of the outbreak: 11 Mar 2010
Outbreak status: Continuing (or date resolved not provided)
Epidemiological unit: Farm
Affected animals: Species (_equidae_) Susceptible (120) Cases (97)
Deaths (0) Destroyed (0) Slaughtered (0)
Affected Population: A farm with sport horses (riding) where mares
were inseminated with infected semen.

(AVE 3): Pilar, Pilar, BUENOS AIRES
Date of start of the outbreak: 27 Apr 2010
Outbreak status: Continuing (or date resolved not provided)
Epidemiological unit: Farm
Affected animals: Species (_equidae_) Susceptible (141) Cases (5)
Deaths (0) Destroyed (0) Slaughtered (0)
Affected Population: A closed district with sport horses (jumping and
polo) where animals from an infected farm (AVE 2) arrived.

(AVE 4): Ranchos, Gral. Paz, BUENOS AIRES
Date of start of the outbreak: 27 Apr 2010
Outbreak status: Continuing (or date resolved not provided)
Epidemiological unit: Farm
Affected animals: Species (_equidae_) Susceptible (100) Cases (2)
Deaths (0) Destroyed (0) Slaughtered (0)
Affected Population: A farm with sport horses where mares were
inseminated with infected semen.

(AVE 5) Suipacha, Suipacha, BUENOS AIRES
Date of start of the outbreak: 27 Mar 2010
Outbreak status: Continuing (or date resolved not provided)
Epidemiological unit: Farm
Affected animals: Species (_equidae_) Susceptible (21) Cases (4)
Deaths (0) Destroyed (0) Slaughtered (0)
Affected Population: A farm with sport horses where a mare from the
index farm arrived.

(AVE 6): San Vicente, San Vicente, BUENOS AIRES
Date of start of the outbreak: 22 Apr 2010
Outbreak status: Continuing (or date resolved not provided)
Epidemiological unit: Farm
Affected animals: Species (_equidae_) Susceptible (80) Cases (1)
Deaths (0) Destroyed (0) Slaughtered (0)
Affected Population: A farm with sport horses where a mare was
inseminated with infected semen.

(AVE 7): Autonomous City of Buenos Aires, CAPITAL FEDERAL
Date of start of the outbreak: 30 Apr 2010
Outbreak status: Continuing (or date resolved not provided)
Epidemiological unit: Farm
Affected animals: Species (_equidae_) Susceptible (195) Cases (2)
Deaths (0) Destroyed (0) Slaughtered (0)
Affected Population: A club with jumping horses where animals from an
infected farm (AVE 2) arrived.

(AVE 8): Zarate, Zarate, BUENOS AIRES
Date of start of the outbreak: 10 Apr 2010
Outbreak status: Continuing (or date resolved not provided)
Epidemiological unit: Farm
Affected animals: Species (_equidae_) Susceptible (10) Cases (5)
Deaths (0) Destroyed (0) Slaughtered (0)
Affected Population A farm where horses from the index farm came to graze.

Summary of outbreaks:
Total outbreaks: 8
Total animals affected: Species (_equidae_) Susceptible (808) Cases
(196) Deaths (0) Destroyed (0) Slaughtered (0)
Outbreak statistics: Species (_equidae_) Apparent morbidity rate
(24.26 percent) Apparent mortality rate (0.00 percent) Apparent case
fatality rate (0.00 percent) Proportion susceptible animals lost*
(0.00 percent)
* 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: A health alert has been
declared across the country, and movements of horses are prohibited
in the city and in the province of Buenos Aires. All detected cases
are related to mares inseminated with semen from the same stud;
investigations are underway.

Control measures:
Measures applied: Quarantine; Movement control inside the country;
Screening; Vaccination prohibited; No treatment of affected animals
Measures to be applied: No other measures

Diagnostic test results:
Laboratory name and type: Virology Institute, INTA-Castelar (National
laboratory)
Tests and results:
Species / Test / Test date / Result
_equidae_ / reverse transcription-polymerase chain reaction (RT-PCR)
/ 19 Apr 2010 / Positive
_equidae_ / seroneutralization test (SNT) / 05 Apr 2010 / Positive
_equidae_ / virus isolation / 31 Mar 2010 / Positive

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

Map of outbreak locations
Location of current outbreaks [see website for map] Click on map to zoom in.

--
Communicated by:
ProMED-mail

[see also:
Equine viral arteritis - Argentina ex Holland 20100509.1513]
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