Climate and emerging diseases: dangerous connections found

Climate change may affect human health directly or indirectly. In addition to increased threats of storms, flooding, droughts, and heat waves, other health risks are being identified. In particular, new diseases are appearing, caused by infectious agents (viruses, bacteria, parasites) heretofore unknown or that are changing, especially under the effect of changes in the climate (change of host, vector, pathogenicity, or strain). These are so-called "emerging" or "re-emerging" infectious diseases, such as leishmaniasis, West Nile fever, etc. According to the WHO, these diseases are causing one third of deaths around the world, and developing countries are on the front line.

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