Weakness can be an advantage in surviving deadly parasites, a new study shows

When battling an epidemic of a deadly parasite, less resistance can sometimes be better than more. A new study suggests that a lake's ecological characteristics influence how freshwater zooplankton Daphnia dentifera evolve to survive epidemics of a virulent yeast parasite Metschnikowia bicuspidate. The study found that Daphnia populations evolved either enhanced resistance or susceptibility to infection depending on the nutrient concentration and predation levels in the lake.

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