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Name: Abby S.
Status: Student
Age: 15
Location: N/A
Country: N/A
Date: N/A 

What type of microorganism is used in the production of yogurt?

Mainly lactic acid bacteria, for instance lactobacillus species. There is a species-file on Lactobacillus in the Virtual Museum of Bacteria, see

Dr. Trudy Wassenaar
Curator of the Virtual Museum of Bacteria

A variety of bacteria do it, mostly ones from the genus Lactobacillus (such as L. acidophilus and L. bulgaricus.)

Richard E. Barrans Jr., Ph.D.
Assistant Director
PG Research Foundation, Darien, Illinois

Lactobacillus..I believe

Peter Faletra Ph.D.
Office of Science
Department of Energy

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