Yes, it is generally believed that a warmer climate could lead to an increase in infectious diseases. While this is not a simple cause-and-effect relationship, there are several reasons why warmer temperatures could contribute to the spread of certain diseases.

One reason is that warmer temperatures can increase the range and activity of disease-carrying insects, such as mosquitoes and ticks. These insects thrive in warm, humid environments and are known to transmit diseases such as malaria, dengue fever, and Lyme disease. As the climate warms, the range of these insects could expand, bringing diseases to new regions and populations.

Another reason is that warmer temperatures can affect the behavior and reproduction of some disease-causing microorganisms. For example, the bacterium Vibrio cholerae, which causes cholera, has been shown to grow more rapidly in warmer waters. This could increase the likelihood of cholera outbreaks in areas with poor sanitation and limited access to clean water.

Finally, climate change can also disrupt ecosystems and alter the behavior of animals, which can have indirect effects on disease transmission. For example, changes in temperature and rainfall patterns could affect the availability of food and water for animals, leading to changes in migration patterns and interactions with humans. This could increase the risk of diseases that are transmitted between animals and humans, such as Ebola and the Nipah virus.

There are many sources that discuss the relationship between climate change and infectious diseases. The World Health Organization (WHO) has published several reports and articles on this topic, including a 2018 report titled "Climate Change and Health: Infectious Diseases." The Centers for Disease Control and Prevention (CDC) and the Intergovernmental Panel on Climate Change (IPCC) have also produced reports and articles on this subject.
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