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Unit 4 Chapter 34
Gastrointestinal Infections and Food Poisoning
Question | Answer |
---|---|
5 normal flora of GI with 100% incidence | Bacteroides fragilis,Bacteroides spp., Fusobacterium spp., Enterococcus spp., Escherichia coli |
5 common pathogens | Rotavirus, Enteric Adenovirus, Caliciviruses, Astroviruses, Campylobacter jejuni |
5 common vehicles for food borne illnesses | Undercooked chicken, eggs, unpasteurized milk, water, fried rice |
MAC and SMAC | MAC- to recover Enterobacteriaceae and other nonfastidious, gram-negative bacilli; inhibits gram-positive organisms and some fastidious gram-negative bacilli; SMAC-differential medium to detect sorbitol-negative Escherichia coli; contains sorbitol |
XLD | Differential and selective medium to isolate Salmonella and Shigella spp. from stool; inhibits most colon flora and most gram-positive bacteria; certain Shigella spp(S. dysenteriae and S. flexneri) may be slightly inhibited |
HE | Highly selective medium to recover primarily Salmonella and Shigella spp., inhibits common colon flora; contains indicators to detect hydrogen sulfide production |
CIN | Selective medium primarily to isolate and recover Yersinia enterocolitica and Aeromonas spp., Plesiomonas shigelloides may also be recovered; inhibits most gram-positive cocci, and most gram-negative bacilli, particularly the Enterobacteriaceae |