Location: Outside U.S.
Date: Fall 2012
Does yogurt contain gram positive or gram negative bacteria or both?
The typical strains are gram positive.
Lactobacillus bulgaricus and Streptococcus thermophilus, which are
commonly found in yogurt, are Gram-positive bacteria.
To my knowledge, the main bacterial cultures used in yogurt include
subspecies of Lactobacillus delbrueki and Streptococcus salivarius.
Both are Gram positive bacteria.
S. Unterman Ph.D.
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Update: November 2011