Stamen Grigorov (1878<unk>1945), ọmọ ile-iwe iṣoogun Bulgarian kan ni Geneva, kọkọ ṣayẹwo microflora ti yogurt Bulgarian. Ni ọdun 1905, o ṣe apejuwe rẹ bi o ti ni awọn kokoro arun ti o n ṣe iṣelọpọ lactic acid. Ni ọdun 1907, kokoro arun ti o ni iṣelọpọ ni a pe ni Bacillus bulgaricus (ni bayi Lactobacillus delbrueckii subsp. bulgaricus). Oluṣakoso Nobel ti Russia ati onimọ-jinlẹ Ilya Mechnikov, lati Institut Pasteur ni Paris, ni ipa nipasẹ iṣẹ Grigorov ati hypothesized pe lilo deede ti yogurt jẹ iduro fun awọn Bulgarian pectobacillus pectobacillus. Stamen Grigorov ṣe apejuwe rẹ ni igba pipẹ bi ounjẹ ti o dara fun ilera.
Bacillus bulgaricus