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Fungal thermotolerance revisited and why climate change is unlikely to be supercharging pathogenic fungi (yet).

Fungal Biology 2024 Februrary
Thermotolerance has been viewed as an uncommon characteristic among the fungi and one of the reasons that less than 1% of the described species operate as opportunistic pathogens of humans. Growth at 37°C is certainly a requirement for a fungus that invades the body core, but tens of thousands of nonpathogenic species are also able to grow at this temperature. Ergo, body temperature does not serve as a thermal barrier to the development of infections by many harmless fungi. The absence of other virulence factors must be more demanding. This observation raises questions about the hypothetical links between climate change and the increasing number of life-threatening human mycoses. Given the widespread distribution of fungal thermotolerance and the 1°C (2°F) increase in global temperature over the last 140 years it seems unlikely that the warming climate has driven the evolution of more virulent strains of fungi. More compelling explanations for the changes in the behavior of fungi as disease agents include their adaptation to the widening use of azole antifungals in hospitals and the wholesale application of millions of tons of the same class of heterocyclic chemicals in agriculture. On the other hand, climate change is having a significant effect on the spread of human mycoses by extending the geographical range of pathogenic fungi. A related increase in fungal asthma caused by spore inhalation is another likely consequence of planetary change.

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