On the other hand, there is the correlation: the higher the midsummer temperatures, the faster many arboviruses multiply in mosquitoes. And the higher the risk that mosquitoes can transmit these viruses to humans and animals.
It is becoming increasingly clear that even native mosquito species can transmit a variety of viruses. The heatwave summer of 2018 saw the first outbreak of West Nile virus in eastern Germany. Since then, there have been annual cases of the disease in birds, horses and humans. "The transmission probability of this virus is directly temperature-dependent: If temperatures rise, so does the risk of infection," says Dr Renke Lühken, head of the Arbovirus Ecology research group at BNITM.
The interplay between, for example, rising temperatures, rising sea levels, changed precipitation regimes and the risk of transmission of pathogens is very complex. This was recently described in a study by the University of Hawaii in Nature Climate Change.