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Histopathology and Ultrastructure of the Hemocytic Response to an Acid‐Fast Bacterial Infection in Cultured Penaeus vannamei
Author(s) -
Krol R. M.,
Hawkins W. E.,
Vogelbein W. K.,
Overstreet R. M.
Publication year - 1989
Publication title -
journal of aquatic animal health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 52
eISSN - 1548-8667
pISSN - 0899-7659
DOI - 10.1577/1548-8667(1989)001<0037:hauoth>2.3.co;2
Subject(s) - penaeus , shrimp , biology , ultrastructure , bacteria , histopathology , microbiology and biotechnology , granule (geology) , electron microscope , pathology , anatomy , fishery , genetics , medicine , paleontology , physics , optics
Two specimens of cultured Pacific white shrimp Penaeus vannamei exhibiting dark pigmentation in the abdominal area were examined by light and electron microscopy and found to be infected with an unidentified acid‐fast bacterium. The hemocytic response to the infection resulted in multifocal nodules composed of a dense melanized core of bacteria, compacted cells, and necrotic areas surrounded by a multilayered capsule of small‐ and large‐granule hemocytes. Small‐granule hemocytes were the predominant cell type in the response. Sequestered bacteria appeared intact. This finding suggested that the host's cellular response did not completely protect against the infection.