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MLT-Vibrionaceae
Microbiology
| Question | Answer |
|---|---|
| Whats basic info of Vibrionaceae? | 1.Gram negative rod 2.facultative aerobic 3.good growth of Mac 4.Oxidase positive 5.Halophilic |
| What is Mac agar? | MacConkey Agar, a selective and differential agar |
| Why Mac is selective? | Crystal violet and bile salts:no growth of Gram + bacteria and fastidious Gram - bacteria. Gram-negative enteric bacteria can tolerate bile salts because of their bile-resistant outer membrane. |
| Why Mac can use to differentiate? | lactose fermenting gram-negative rods -> Purple, eg. Vibrionaceae non-lactose fermenting gram-negative rods -> Colourless |
| What are the species of Vibrio ? | Vibrio cholerae, Vibrio parahaemolyticus, Aeromonas, Plesiomonas |
| What is 0129(150ug)? | Vibrio static agent 0129 (2,4-Diamino-6,7-di-iso-propylpteridine phosphate) . Vibrio is sensitive it. Aeromonas is resistant to it. |
| What is the reservoir of Vibrio? | Shellfish |
| What would be caused by V.cholerae? | gastroenteritis |
| What toxic would be produced by V.cholerae? | Cholera toxin, it is a neurotoxin |
| The function of Cholera toxin? | 1.Block uptake of Na and Cl from lumen 2.Lead to great loss of fluid and electrolyte(15-20L/day) |
| What is the transport medium for Vibrio? | Transport medium: Cary Blair semi solid agar |
| What is the enrichment medium for Vibrio? | Alkaline peptone broth, pH 8.4 |
| What is the selective and differential culture medium for Vibrio? | Thiosulphate Citrate Bile salt Sucrose Agar, TCBS V.cholerae: positive, yellow V.parahemolyticus: negative, green |