Current Events: Brain Parasite affects Dopamine Levels in Brain

          New studies show that a parasite called Toxoplasmosis gondii that directly affects how much dopamine there is in the human brain.  It is transmitted to humans through cat faeces that ends up on the fruits and vegetables we eat.  The parasite gets to our brain, where it then infects it by making a cyst in it cells and creating an enzyme called tyrosine hydroxylase, which is a chemical used by our bodies to make dopamine.  Because of this, a carrier of toxoplasmosis gondii can have very high levels of dopamine.  These discoveries may help scientists explain or find cures for dopamine-related disorders such as schizofrenia or Parkinson's disease.  It is estimated that around 22% of Americans have the parasite in their bodies, and most of them live normally.  However, the parasite can be dangerous to those not immune to its affects - especially pregnant women. 

Resources: http://www.sciencedaily.com/releases/2011/11/111104102125.htm