Microsporidia are obligate parasitic unicellular protozoa that can develop and divide in tissue cells, reproduce indefinitely, and are infectious.
Microsporidia proliferate in large numbers in the host cells, gradually replace the host cytoplasm, severely damage the endoplasmic reticulum, mitochondria, and nucleus of the host cells, severely damage the metabolic function of the cells, and eventually lead to cell fragmentation and death.
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