Higher temperatures may alter the geographical distribution of species that transmit disease. In a warmer world, mosquitoes, ticks, and rodents could expand their range to higher latitudes and higher altitudes. The seasonal transmission and distribution of many diseases that are transmitted by mosquitoes (malaria, dengue, yellow fever) and by ticks (Lyme disease, Hantavirus pulmonary syndrome, tick-borne encephalitis) may be accentuated by climate change.