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Single-Celled Fungi Multiply, Alien-Like, by Fusing Cells in Host

Microsporidia cause diarrhea, an illness called microsporidiosis and even death in immune-compromised individuals.

In spite of those widespread medical problems, scientists were uncertain about how these single-celled fungi reproduced in human or animal cells.

But in a study that employed transparent roundworms, biologists at the University of California San Diego succeeded in directly observing how these microorganisms replicate and spread. And what they saw surprised them.