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Climate change is increasing the risk of emerging parasites, necessitating an understanding of how shifting temperature regimes influence parasite evolution. In this study, the authors evolved a wild parasitic bacterium in a Caenorhabditis eleganshost across the thermal range and extremes of Cabo Verde — the site of field collection. They found that increasing temperature gave rise to more virulent (harmful) parasite variants, suggesting that rising environmental temperatures can affect parasites’ genetic makeup and disease traits.

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