densely basophilic inclusions, particularly in H&E stained
gill sections (Fig. 10A) and rapidly stained whole gills (Fig. 10B), or by staining of
hemolymph smears (Fig. 11). Smears
are useful in early stages of infection, but not later when the
hemocyte population has been depleted by the virus. Since
nuclear disintegration similar to that caused by YHV can
be found with some bacterial infections, it is important to
be sure that no bacteria appear in smears, if YHVinfection
is to be confirmed. Research onYHVin Thailand has been
reviewed along with current practices for diagnosis,
prevention and contro