There are no specific clinical signs for EHP infection, and currently
it can be diagnosed through histological examination,
in situ hybridization and PCR (Tangprasittipap et al., 2013). EHP
is an intracellular spore-forming parasite, it replicates within the
cytoplasmic area of the tubule epithelial cells in the hepatopancreas.
Histology of infected tissues reveals several developmental
stages, including the early sporogonal plasmodia and mature
spores. The plasmodia are multinucleate and mature spores are
oval shaped, measuring 0.7–1.1 lm. The spores contain a single
nucleus, 5–6 coils of the polar filament, a posterior vacuole, an
anchoring disk attached to the polar filament, and a thick
electron-dense wall (Tourtip et al., 2009).
There are no specific clinical signs for EHP infection, and currentlyit can be diagnosed through histological examination,in situ hybridization and PCR (Tangprasittipap et al., 2013). EHPis an intracellular spore-forming parasite, it replicates within thecytoplasmic area of the tubule epithelial cells in the hepatopancreas.Histology of infected tissues reveals several developmentalstages, including the early sporogonal plasmodia and maturespores. The plasmodia are multinucleate and mature spores areoval shaped, measuring 0.7–1.1 lm. The spores contain a singlenucleus, 5–6 coils of the polar filament, a posterior vacuole, ananchoring disk attached to the polar filament, and a thickelectron-dense wall (Tourtip et al., 2009).
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