<prompt> Staph. aureus causes vomiting in 16-18 hours. The mechanism of action isStimulation of cy AMPVagal stimulationStimulation of cy GMPActs through ganglioside GM receptor  <response>: The mechanism by which the staphylococcus aureus causes vomiting is uncertain but may involve direct neural stimulation of the autonomic nervous system rather than a local effect on G.I.T mucosa. 