When Hurricane Katrina struck, many displaced families were left wondering how to explain the changes to their children with autism, said Lynda Geller, a professor of child and adolescent psychiatry at the New York University's School of Medicine.

CNN: Looking for hope in the ashes

"Like everything else, dose makes the poison, " said Dr. Robert Geller, medical director of the Georgia Poison Center and an associate professor at Emory University School of Medicine.

CNN: Lottery winner exhumed; cyanide deaths rare, experts say