INFECTIOUS SALMON ANAEMIA IN THE UNITED STATES OF AMERICA
Follow-up report No. 1
Information received by OIE on 3 July 2003 from Dr Peter Fernandez, Associate Administrator, Animal and Plant Health Inspection Service, United States Department of Agriculture (USDA), Washington, DC:
End of previous report period: 16 June 2003 (see Disease Information , 16 , 146, dated 20 June 2003).
End of this report period: 3 July 2003.
New outbreaks: Location: Prince Cove, Cobscook Bay, State of Maine. No. of outbreaks: 1
Description of affected population in the new outbreak:
This is the second outbreak of infectous salmon anaemia (ISA) virus in Maine in 2003. The first infected cage has been completely depopulated and the remainder of the site continues to test negative. Following the first incidence of ISA in Maine, reported to the OIE on 16 June 2003, the USDA accelerated surveillance in Cobscook Bay. On 25 June 2003, lethargic fish were observed and reported by the attending veterinarian. The lethargic fish were included in surveillance testing samples. All samples taken from other cages at the site tested negative.
Total number of animals in the new outbreak: species: pis; susceptible: 23,500; cases: 1 cage; deaths:
destroyed: 0; slaughtered: 23,500
A. Laboratory where diagnosis was made: MicroTechnologies Inc., Richmond, Maine.
B. Diagnostic tests used: indirect fluorescent antibody test and RT-PCR(1) (positive results were obtained on 27 June 2003).
Epidemiology: see previous report.
Control measures during reporting period:
- The cage is scheduled to be depopulated no later than 4 July 2003.
- Quarantine and movement control inside the country.
- Stamping out.
(1) RT-PCR: reverse transcription - polymerase chain reaction.