In Jainism, yogurt culture (bacteria) are considered two-sensed beings (Beindriya Jiva). That means they are believed to have two senses: touch and taste. There is some variation in how very small life-forms are categorized in different Jain texts, but the common view in many Jain sources places microbes like bacteria in the two-sensed category.

If you’d like, I can point you to a JainKnowledge.com page that discusses the sense-based classification of jivas.