In Infectious Behavior, neurobiologist Paul Patterson examines the involvement of the immune system in autism, schizophrenia, and major depressive disorder. Although genetic approaches to these diseases have garnered the lion's share of publicity and funding, scientists are uncovering evidence of the important avenues of communication between the brain and the immune system and their involvement in mental illness. Patterson focuses on this brain-immune crosstalk, exploring the possibility that it may help us understand the causes of these common but still mysterious diseases. The heart of this engaging book, accessible to nonscientists, concerns the involvement of the immune systems of the pregnant woman and her fetus, and a consideration of maternal infection as a risk factor for schizophrenia and autism. Patterson reports on research that may shed light on today's autism epidemic. He also outlines the risks and benefits of both maternal and postnatal vaccinations.