Microbiology General 77ceb16a Lactose nonfermenting are all except - A Shigella sonnei B Shigella dysenteriae C Shigella flexneri D Shigella boydii High-Yield Explanation Ans. is 'a' i.e., Shigella sonnei * Lactose and sucrose are not fermented except by Sh. Sonnei which ferment them late.