Growth factor required for salmonella:: (A) Tryptophan, (B) Niacin, (C) Vitamin B12, (D) Citrate
Answer is A. Salmonella require tryptophan as an essential growth factor. Also remember: Legionella require Iron and Cysteine Mycoplasma require sterols Ureaplasma require sterols and urea Halophilic Vibrio (parahemolyticus) require salt.