Climate change can also have complicated, compounding and contradictory effects on pathogens and vectors. Increased rainfall creates more habitat for mosquitoes that transmit diseases like malaria, but too much rain washes away the habitat. Decreased rainfall also increases disease risk when people without reliable access to water use containers to store water where mosquitoes, such as the vectors of dengue fever Aedes aegypti and A. albopictus, lay their eggs. Hotter temperatures also increase mosquito-bite rate, parasite development and viral replication! Certain species of snails are intermediate hosts for many helminth parasites that make humans, livestock and wild animals sick. When it gets hot, the snails can produce 2-3 times as many infective larvae; however, if it becomes too hot, many pathogens and their vectors cannot survive or reproduce.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report