Final answer:
Lactobacilli are commonly called Doderlein's bacilli and are part of the Lactobacillales order, involved in lactic acid fermentation and known for health benefits.
Step-by-step explanation:
Lactobacilli are also commonly referred to as Doderlein's bacilli, particularly in reference to the types found in the human vagina where they help maintain a healthy pH balance. They are not E. coli, Streptococcus, or Salmonella, which are different types of bacteria. Lactobacilli are a part of the order Lactobacillales, which includes low G+C gram-positive bacteria and is known for its role in lactic acid fermentation, a process pivotal during the production of fermented foods. Specifically, Lactobacillus bacteria are known for their health benefits, such as promoting digestive health.