In 2007, for example, WHO pointed to rising temperatures in an outbreak of a mosquito-borne virus, Chikungunya, in Italy. Yet WHO misdiagnosed the problem. Modern transportation, not climate change, caused the outbreak.
In that case, the transmitter of the disease, or vector, was the Asian Tiger mosquito. It is native to Asia, but exported world-wide in shipments of used tires. It is now abundant in parts of U.S. and in 12 countries in Europe. In cities, it breeds in man-made containers of water, such as saucers under flower-pots, water barrels, blocked gutters and so on. The virus was carried to Italy by an infected Indian who flew from Delhi, where an epidemic of the disease was then raging.