NANFA-- Infectious salmon anemia - USA
Fri, 27 Jun 2003 09:36:26 -0400
> Date: 25 June 2003
> From: ProMED-mail <promed_at_promedmail.org>
> Source: Office International des Epizooties(OIE), Disease Information
> Infectious salmon anemia in the United States of America
> - -------------------
> Emergency report
> Information received on 16 Jun 2003 from Dr Peter Fernandez, Associate
> Administrator, Animal and Plant Health Inspection Service, United States
> Department of Agriculture (USDA), Washington, DC:
> Report date: 16 Jun 2003.
> Nature of diagnosis: laboratory.
> Date of initial detection of animal health incident: 11 Jun 2003.
> Estimated date of first infection: 9 Jun 2003.
> Location: Broad Cove, Cobscook Bay, State of Maine
> No. of outbreaks: 1 farm
> Description of affected population: Atlantic salmon (Salmosalar).
> Total number of animals in the outbreak:
> species/ susceptible/ cases/ deaths/ destroyed/ slaughtered
> pis/ 28,000/ 1
> cage/ .../ 0/ 28,000
> This is the first incidence of infectious salmon anemia (ISA) virus in
> Maine since the ISA outbreak in the spring of 2001 (see Disease
> Information, 14 , 65, et seq.). The surveillance programme that was
> implemented as a result of the 2001 outbreak allowed early detection of
> Following the outbreak of 2001, all infected and exposed sites were
> depopulated, cleaned and disinfected. Sites were fallowed for up to 90
> days. Some sites were restocked in the spring of 2002. Biosecurity
> were implemented, an integrated pest management programme implemented (for
> sea lice), control of transportation movement implemented, and single
> year-class farming implemented. All farms participate in the USDA ISA
> programme. As part of the surveillance programme, low-risk sites are
> sampled monthly, and high-risk sites are sampled twice a month. It was
> through this
> surveillance programme that the samples which led to this detection were
> taken on 9 Jun 2003.
> A. Laboratory where diagnosis was made: MicroTechnologiesInc., Richmond,
> B. Diagnostic tests used: indirect fluorescent antibody test (positive at
> +3) and RT-PCR(1) (positive). Tissue samples are being cultured for
> definitive confirmation.
> A. Source of agent / origin of infection: unknown.
> B. Mode of spread: ISA virus is considered a slow spreading low virulent
> virus. The mode of spread of ISA virus may be
> passively in seawater, via sea lice as a vector, or there may be a natural
> host acting as a reservoir, although none of these has been confirmed in
> the field.
> Control measures: on 16 Jun 2003 the farm was depopulated.
> (1) RT-PCR: reverse transcription - polymerase chain reaction
> - --
> [see also:
> Hemorrhagic smolt syndrome, salmon - Norway: etiology 20030512.1175
> - ----
> Infectious salmon anemia - Denmark (Faroe Is.) 20000524.0819
> - ----
> Infectious salmon anemia - UK (Scotland) (04) 19981006.1979
> Infectious salmon anemia - UK (Scotland): RFI 19980930.1940
> Infectious salmon anemia - UK (Scotland) (02) 19980521.0977
> - ----
> Hemorrhagic kidney syndrome, Atlantic salmon - Canada 19971224.2539]
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