There has been a recent article in Scientific American which links schizophrenia to Infection by a disease, such as influenza. Now this may seem strange to you, but it is not completely bollocks.
It is already well known that if a mother gets especially stressed during preganacy, her stress hormones can cross the placenta and this can cause problems for the baby.
Stoopid environmental action
5 hours ago in The Phytophactor