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Population Biology of Foodborne Pathogenic E. Coli and Salmonella Along the Production and Supply Chain of Pork

ABSTRACT第11-13页
摘要第14-16页
Abbreviations used in this disseilation第16-19页
1. INTRODUCTION第19-29页
    1.1 LIVESTOCK DEVELOPMENT IN CHINA第19-20页
    1.2 PIG DEVELOPMENT IN CHINA第20-23页
    1.3 EXTRA INTESTINAL PATHOGENIC E.COLI ASSOCIATED OUTBREAKS IN CHINA第23-24页
    1.4 E.coliO157:H7 associated outbreaks in China第24-26页
    1.5 SALMONELLA IN CHINA第26-27页
    1.6 ANTIMICROBIAL RESISTANCE第27页
    1.7 SIGNIFICANCE OF THE STUDY第27-29页
2. REVIEW OF LITERATURE第29-67页
    2.1 ESCHERICHIA COLI第29-45页
        2.1.1 Characteristics of E. coli第29页
        2.1.2 Classification of pathogenic E. coli第29-34页
            2.1.2.1 Entero Pathogenic E. coli (EPEC)第30页
            2.1.2.2 Shiga-toxin producing E. coli第30-31页
            2.1.2.3 Enterotoxigenic E. coli (ETEC)第31页
            2.1.2.4 Entroinvasive E. coli (EIEC)第31页
            2.1.2.5 Enteraggregative E. coli (EAEC)第31页
            2.1.2.6 Diffuse adherent E. coli (DAEC)第31页
            2.1.2.7 Extraintstinal Pathogenic E. coli (ExPEC)第31-34页
            2.1.2.8 Uropathogenic E. coli (UPEC)第34页
        2.1.3 Disease in Animals第34-36页
        2.1.4 E. coli contamination in retail meat第36页
        2.1.5 Distribution of ExPEC and O157H7 in China第36-38页
        2.1.6 Epidemiology第38-39页
        2.1.7 Pathogensis of E. coli第39-43页
        2.1.8 Diagnosis第43-44页
        2.1.9 Control of E. coli infections第44-45页
            2.1.9.1 Treatment with Antibiotics第44页
            2.1.9.2 Phage theraphy第44页
            2.1.9.3 Vaccine第44-45页
    2.2 SALMONELLA第45-67页
        2.2.1. General Characteristics of Salmonella第45页
        2.2.2 Classification of Salmonella第45-53页
        2.2.3 Salmonella in different animals第53-55页
        2.2.4 Distribution of Salmonella in China第55-56页
        2.2.5 Epidemiology of Salmonella第56-57页
        2.2.6 Pathogenesis第57-58页
        2.2.7 Diagnosis and Characterization第58-61页
            2.2.7.1 Phenotyping Methods第59页
            2.2.7.2 Genotyping Methods第59-61页
        2.2.8 ANTIMICROBIAL RESISTANCE AND PUBLIC HEALTH第61-63页
            2.2.8.1 Mechanisms of antimicrobials第61-62页
            2.2.8.2 Antimicrobial resistance第62-63页
        2.2.9 Transfer of antimicrobial resistance factors第63-64页
        2.2.10 CONTROL STRATEGIES第64-65页
        2.2.11 Objectives第65-67页
3. PHYLOGENETIC GROUPING, DISTRIBUTION OF VIRULENCE GENES,ANTIBIOTIC RESISTANCE AND RESISTANT GENES OF E. COLI ISOLATESALONG THE PSCP第67-93页
    3.1 INTRODUCTION第67页
    3.2 MATERIALS AND METHODS第67-77页
        3.2.1 Samples第67-68页
        3.2.2 Media Preparation第68-69页
            3.2.2.1 BHI preparation第68页
            3.2.2.2 MacConkey agar preparation第68-69页
        3.2.3 Bacterial isolation第69页
        3.2.4 Analytical Profile Index (API) 20E第69-70页
            3.2.4.1 Principle第69-70页
            3.2.4.2 Procedure第70页
        3.2.5 Extraction of DNA第70-72页
        3.2.6 Phylogenetic grouping第72页
        3.2.7 PCR of virulence genes associated with ExPEC第72页
        3.2.8 Antimicrobial susceptibility testing第72-75页
            3.2.8.1 Preparation of MHA第73页
            3.2.8.2 Disc diffussion method第73-75页
        3.2.9 Detection of antibiotic resistance genes第75-76页
        3.2.10 Statistical analysis第76-77页
    3.3 RESULTS第77-89页
        3.3.1 Phylogenetic grouping第77-78页
        3.3.2 Virulent genes along the production and supply chain of pork第78-83页
        3.3.4 Antibiotic resistance第83-84页
        3.3.5 Antibiotic resistance genes(ARGs)第84-89页
    3.4 DISCUSSION第89-93页
4. PREVALENCE,DISTRIBUTION OF ANTIBIOTIC RESISTANCE ANDRESISTANCE GENES OF SALMONELLA ENTERICA SEROVARS ALONG THEPSCP第93-112页
    4.1 MATERIALS AND METHODS第93-99页
        4.1.1 Sample collection第93-94页
        4.1.2 Processing of samples第94页
        4.1.3 Media preparation第94页
        4.1.4 MPN series for enumeration of Salmonella第94-95页
        4.1.5 PCR targeting S almonella specific invA gene第95-96页
        4.1.6 Bacterial isolation and DNA extraction第96-98页
        4.1.7 Antimicrobial susceptibility testing第98页
        4.1.8 Detection of antibiotic resistance genes第98-99页
    4.2 RESULTS第99-109页
        4.2.1 Prevalence of Salmonella第99-100页
        4.2.2 Isolation of Salmonella enterica subsp.1 serovars第100-102页
        4.2.3 Comparision between specific antisera and PCR method第102-105页
        4.2.4 Antibiotic resistance in Salmonella serovars第105-106页
        4.2.5 Prevalence of Antimicrobial genes along the PSCP第106-109页
    4.3 DISCUSSION第109-112页
5. QUANTIFICATION AND ISOLATION OF PATHOGENIC SHIGA TOXINESCHERICHIA COLI O157:H7 ALONG THE PSCP第112-126页
    5.1 INTRODUCTION第112页
    5.2 MATERIALS AND METHODS第112-117页
        5.2.1 Sample collection and processing第112-113页
        5.2.2 MPN series for enumeration of E. coli O157:H7第113-114页
        5.2.3 Preparation of Media第114页
        5.2.4 Bacterial isolation and DNA extraction第114-115页
        5.2.5 Pathogenicity testing of E. coli O157:H7 using Balb/C mice第115-116页
        5.2.6 Histopathology第116-117页
    5.3 RESULTS第117-124页
    5.4 DISCUSSION第124-126页
CONCLUSION第126-128页
REFERENCES第128-147页
ACKNOWLEDGEMENTS第147-150页
PUBLICATIONS第150页

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