MIKROCYTOSIS( MIKROCYTOS MACKINI )IN THE UNITED STATES OF AMERICA
( Date of previous outbreak of Mikrocytosis in the United States of America reported to the OIE: July 2002).
Information received on 9 October 2003 from Dr Peter Fernandez, Associate Administrator, Animal and Plant Health Inspection Service, United States Department of Agriculture (USDA), Washington, DC:
Report date: 7 October 2003.
Nature of diagnosis: clinical and laboratory.
Date of initial detection of animal health incident: 4 April 2003.
Location: South Puget Sound, Washington. No. of outbreaks: 1;
San Juan Islands, Washington. No. of outbreaks: 4.
Description of affected population: Pacific oyster( Crassostrea gigas ).
Diagnosis: the organism in the above described areas was detected in large oysters that were over 3 years old. Some of the oyster sampled were feral. However, detection of the organism has also been made in oysters collected either from farmed commercial sites.
A. Laboratory where diagnosis was made: AquaTechnics, Sequim, State of Washington.
B. Diagnostic tests used: tissue imprints, histopathology, and PCR(1).
C. Causal agent: Mikrocytos mackini .
A. Source of agent / origin of infection: unknown.
B. Mode of spread: unknown.
C. Other epidemiological details: the detection of Mikrocytos mackini was picked up as a result of the routine surveillance that is in place for that area. No increase in oyster mortality triggered the collection of samples.
- quarantine and movement control inside the country
(1) PCR: polymerase chain reaction