<prompt> True about cholera vibrios is -Can tolerate wide range of alkaline pHNon motile bacilliCant be grown in mediaAll  <response>: Ans. is a i.e., Can tolerate wide range of alkaline pH VIBRIO CHOLERAE Morphology - Gram negative - Bacilli - Non capsulated - Comma shaped - S-shaped or spiral form may be seen. - Arranged in parallel rows -- Fish in stream appearance. - Motile by polar flegellum --- Daing type motility. - Actively motile vibrios suggest a Swarm of gnats . Culture characteristic - Strongly aerobic obligate aerobe - Growth is better in alkaline medium pH 6-4-9.6 - 0.5-1 Nacl is required for optimal growth. - MaConkeys agar -- Initial colourless colonies, later become reddish due to late lactose fermentation. - Blood agar -- Initially sorrounded by a zone of greening, which later become clear due to hemodigestion. - In gelatin stab culture, infundibulifornz funnel shaped or napiform turnip shaped liquefaction occur. Remember . While 0.5-1 NaCl is required for optimal growth, 6 or above NaCl inhibits the growth. 