Subject: Did ancient man use antibiotics?

I am doing a science fair project.  My hypothesis is that ancient man or 
primitive peoples were able to obtain and use antibiotics.  Since antibiotics 
are naturally occuring fungi, then ancient/primitive peoples should have 
"discovered" their beneficial properties.

To test my hypothesis, I exposed food items (cheese, bread, fruit and 
mushrooms), which may have been available to ancient peoples, to the air for 
a week.  I then scraped bacteria from an old piece of steak onto a slide and 
scraped the mould from one of the other foods onto to the same slide.  
If the bacteria started to disappear then I knew I had found an antibiotic.  I
concluded that ancient people could have easily cultivated and used antibiotics
 but I didn't try treating myself.

Has anyone identified that ancient or primitive peoples used antibiotics?  
Is anyone researching this matter?

Re: Did ancient man use antibiotics?