depression in young people

Summary- Depression in the young population have grown and are growing rapidly. Scientists think this may be because of a loss of healthy bacteria that contributes to an imflammatory response in the brain. A scientist says, "The modern world has become so clean, we are deprived of the bacteria our immune systems came to rely on over long ages to keep imflammation at bay."
Benign microorganisms taught the immune system how to tolerate harmless microorganisms, while reducing imflammatory responses that link to the development of illnesses, from cancer to depression.
Impact- Since we are deprived of what our body needs to stay healthy and happy, the young population is becoming more and more depressed. This impacts our young population.
Critique- I know I don't want to be depressed, we need to find a way to get the microorganisms back into our immune systems and keep kids from being depressed.
http://scienceagogo.com/news/20101107220930data_trunc_sys.shtml