Are non-lactose fermenters Gram-negative?

Are non-lactose fermenters Gram-negative? E. coli are facultative anaerobic, Gram-negative bacilli that will ferment lactose to produce hydrogen sulfide. Up to 10% of isolates have historically been reported to be slow or non-lactose fermenting, though clinical differences are unknown. Which Gram-negative rods are lactose fermenters? Klebsiella, or Enterobacter spp. “Lactose-negative Read more…