Microbiology General b3674991 Which of the following bacteria act by increasing c-AMP - A Vibrio cholera B Staphylococcus aureus C E. coli, heat stable toxin D Salmonella High-Yield Explanation Toxin acts by cAMP are: LT of E.coli, Cholera toxin, Pertussis toxin, Anthrax toxin (edema factor).