types of bacteria in yogurt
A bowl of yogurt with fresh fruit. Photo Credit abdone/iStock/Getty Images. Yogurt is made by fermenting many types of milk -- including whole, skim, and evaporated milk -- with lactic acid bacteria. These beneficial bacteria are usually from the types called lactobacillus bulgaricus and Streptococcus thermophilus.ifidobacterium are a type of good bacteria found naturally in healthy gastrointestinal systems, and also in fermented foods such as yogurt. Some commercial yogurts feature the probiotic Bifidobacterium strains B. animalis and B. lactis.