<prompt> Bacteria surviving alkaline mediaE.coliShigellaVibrioSalmonella  <response>: Ans: c Vibrio Ref: Ananthanarayan, 7th ed, p. 305Culture characteristics of Vibrio: Strongly aerobic Temperature range 16 - 40deg C pH range 6.4 - 9.6 Growth is better in alkaline medium, optimum pH is 8.2 MacConkeys agar - red colonies due to late fermentation of lactose. Blood agar - initially zone of greening later clears due to haemodigestion Gelatin stab culture: infundibuliform or napiform liquefaction 