MDARD Mosquito Control Practice Exam 2025 – Complete Category 7F Study Guide

The La Crosse virus primarily uses small mammals, particularly chipmunks and squirrels, as its principal hosts in the transmission cycle. This virus is mainly transmitted to humans through the bite of infected Aedes mosquitoes, which become infected when they feed on these small mammals. The rodents serve as an amplification host, allowing the virus to replicate and circulate before being passed on to mosquitoes, which can then infect humans.

Understanding the role of small mammals in the La Crosse virus transmission cycle is crucial for mosquito control efforts. While birds and other animals may play roles in the ecology of some viruses, in the case of La Crosse, the emphasis is on small mammals as the main reservoir. Human hosts are not a significant part of the virus cycle since humans are considered incidental hosts and do not contribute to the virus's maintenance in nature. Domestic animals do not play a major role in this particular transmission cycle, further underscoring the importance of small mammals in the ecology of the La Crosse virus.