Brain: Microsporidia
Microsporidians are intracellular parasites. Parasite growth within the host tissues and formation of xenomas may result in displacement and disruption of tissues, resulting in organ dysfunction. Microsporidium cerebralis infects central nervous system of sea cage-reared Atlantic salmon in British Columbia, resulting in abnormal swimming behaviour and loss of equilibrium.

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Microsporidia - space occupying lesion with minimal host response.

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Xenoma containing microsporidia in fish brain.

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