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Yeast on Pizza bought at "2 for 1" sale!!!!

One of our faculty brought this sample in for analysis - edible or not?.   It is a piece of Pizza he bought at a two for one sale at the local supermarket (that shall remain nameless!).  It was absolutely covered with tiny white glistening colonies of a Saccharomyces-like yeast.  


Qu.  Would it be OK to eat this pizza if you were really hungry?

Qu.  What about mouldy peanuts?

Qu.  What about mouldy cheese?

Qu. What about fungus ripened cheeses e.g. blue cheeses such as  Roquefort?

Qu. What about mycotoxins in foodstuffs?    Is this a problem.  If so, then where?