Yes, pests can carry and transmit diseases to humans and animals through bites, contaminated surfaces, and feces. For example, mosquitoes can transmit malaria, dengue fever, and Zika virus, while rodents can spread hantavirus and salmonella. Cockroaches, flies, and fleas can also carry and spread diseases such as cholera, typhoid, and plague. Proper pest control measures can reduce the risk of disease transmission and protect public health.