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Impact of global warming on viral diseases: what is the evidence?
Roland Zell1, Andi Krumbholz, Peter Wutzler
1Institute of Virology and Antiviral Therapy, Friedrich Schiller University Jena, Hans Knoell Street 2, D-07745 Jena, Germany. Roland.Zell@med.uni-jena.de
Abstract:
Global warming is believed to induce a gradual climate change. Hence, it was predicted that tropical insects might expand their habitats thereby transmitting pathogens to humans. Although this concept is a conclusive presumption, clear evidence is still lacking--at least for viral diseases. Epidemiological data indicate that seasonality of many diseases is further influenced by strong single weather events, interannual climate phenomena, and anthropogenic factors. So far, emergence of new diseases was unlinked to global warming. Re-emergence and dispersion of diseases was correlated with translocation of pathogen-infected vectors or hosts. Coupled ocean/atmosphere circulations and 'global change' that also includes shifting of demographic, social, and economical conditions are important drivers of viral disease variability whereas global warming at best contributes.
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