Guides

Oocysts with elongated sporozoites are characteristic of Goussia. Microscopy-based interpretation and diagnostic features.

Not everything with a capsule is Cryptococcus. Morphology may resemble it, but conclusions require caution.

Hyphae in fish are not always saprolegniosis. It is important to distinguish colonization from invasive processes.

The examined fish showed no visible signs of disease during life. Mortality occurred predominantly at night. Gills were pale, and the fish were slightly emaciated. Necropsy revealed granulomas in the spleen and/or kidneys. Parenchymal organs were enlarged and anemic. The gross appearance was consistent with mycobacteriosis. However, Ziehl–Neelsen staining of impression smears from spleen and kidney did not reveal acid-fast bacteria. The granulomas were necrotic, a feature commonly associated with mycobacterial infections. ...

Intracellular microorganisms in fish: morphology, localization, and diagnostic interpretation.