QUIZ 1. How many enterotoxins have been found in Staphylococcus aureus up to now? 2. Clostridium botulinum can produce a kind of highly fatal toxin, it is an enterotoxin or neurotoxin?What is the lethal dose of this toxin? 3. Where can we usually isolate Campylobacter?Why? 4. What is the basis of the classification of Salmonella spp.?And what is this basis determined by? 5. What makes Listeria monocytogenes highly hazardous to ready-to-eat foods?
1. How many enterotoxins have been found in Staphylococcus aureus up to now? 2. Clostridium botulinum can produce a kind of highly fatal toxin, it is an enterotoxin or neurotoxin? What is the lethal dose of this toxin? 3. Where can we usually isolate Campylobacter? Why? 4. What is the basis of the classification of Salmonella spp.? And what is this basis determined by? 5. What makes Listeria monocytogenes highly hazardous to ready-to-eat foods?
TOXIN-MEDIATED INFECTIONS (TOXICOINFECTION OR INTOXIFICATION) Clostridium perfringens Escherichia coli 0157:H7 x Bacillus cereus
Clostridium perfringens Escherichia coli O157:H7 Bacillus cereus
CLOSTRIDIUM PERFRINGENS 产气荚膜梭菌 x G+,厌氧，产芽孢，棒 杆菌 ×T:10-45°C(opt37-45°C) ×Min pH:5.0 ×aw0.93 NaCl 5%
G+，厌氧，产芽孢，棒 杆菌 T: 10-45˚C (opt 37-45˚C) Min pH : 5.0 aw 0.93 NaCl 5%
高危食品：炖制食品和肉汤 ×感染剂量：105 ×潜伏期：8-24 hours ×发病期：12-24 hours 通常不会致死
高危食品：炖制食品和肉汤 感染剂量：105 潜伏期: 8-24 hours 发病期: 12-24 hours 通常不会致死
PATHOGENIC E.COLI Enteropathogenic E.coli-(EPEC) 肠致病型大肠杆菌 108 cells Enterotoxigenic E.coli-(ETEC) 肠产毒型大肠杆菌 108 cells Enteroinvasive E.coli-(ElEC) 肠侵袭型大肠杆菌 unknown Enteroaggregative E.coli-(EAEC) 肠凝集型大肠杆菌 unknown Enterohemmorhagic E.coli-(EHEC,STEC)(includes VTEC 10 cells 0157:H7) 肠出血型大肠杆菌
Enteropathogenic E.coli - (EPEC) 肠致病型大肠杆菌 108 cells Enterotoxigenic E. coli - (ETEC) 肠产毒型大肠杆菌 108 cells Enteroinvasive E. coli - (EIEC) 肠侵袭型大肠杆菌 unknown Enteroaggregative E. coli - (EAEC) 肠凝集型大肠杆菌 unknown Enterohemmorhagic E. coli - (EHEC, STEC) (includes VTEC 10 cells O157:H7) 肠出血型大肠杆菌