cutting boards, bacteria

[Brother Bob Wiethorn]

I am a high school student trying to gather information on my science project. 
 My experiment is to determine whether plastic or wooden cutting boards harbor 
the most bacteria.  Plastic was favored in the past.  After an experiment in a 
Wisconsin university wood was favored.  This university proposed that natural 
enzymes kill the bacteria or that spores absorb it.  Also, cut grooves make 
plastic more difficult to clean than wood.  If you know of any other 
experiments performed of if you have more information on this subject please 
send me something at this E-Mail address brobob at rcinet.com
Thanks in advance, 

Alicia