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Principles of Medical Microbiology

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Presentation on theme: "Principles of Medical Microbiology"— Presentation transcript:

1 Principles of Medical Microbiology
Principles of Infectious Disease: The Host-Parasite Relationship Colonization, Normal Microbiota & Symbiotic Relationships Pathogenicity and Virulence Mechanisms of Pathogenicity Epidemiology Mechanisms of Immunity Beneficial Harmful Manipulated Antimicrobial Chemotherapy

2 Principles of Infectious Disease
The Host-Parasite Relationship Colonization and Normal Microbiota Permanent residents, transients and opportunists Symbiotic Relationships Mutualism, Commensalism, Parasitism Pathogenicity and Virulence Evolution of parasitism Attenuation of virulence The Infectious Process: 1) Exposure: Oral, respiratory, parenteral, etc 2) Attachment: Pili, capsules, proteins, etc 3) Colonization: Metabolism, replication, avoid clearance 4) Tissue Damage: Toxins, invasiveness, immune response

3 Principles of Infectious Disease
The Host-Parasite Relationship Colonization and Normal Microbiota Permanent residents, transients and opportunists Symbiotic Relationships Mutualism, Commensalism, Parasitism Pathogenicity and Virulence Evolution of parasitism Attenuation of virulence The Infectious Process: 1) Exposure: Oral, respiratory, parenteral, etc 2) Attachment: Pili, capsules, proteins, etc 3) Colonization: Metabolism, replication, avoid clearance 4) Tissue Damage: Toxins, invasiveness, immune response

4 Colonization

5 Normal Microbiota

6 Principles of Infectious Disease
The Host-Parasite Relationship Colonization and Normal Microbiota Permanent residents, transients and opportunists Symbiotic Relationships Mutualism, Commensalism, Parasitism Pathogenicity and Virulence -Evolution of parasitism -Attenuation of virulence The Infectious Process: 1) Exposure: Oral, respiratory, parenteral, etc 2) Attachment: Pili, capsules, proteins, etc 3) Colonization: Metabolism, replication, avoidance of immune clearance 4) Tissue Damage: Toxins, invasiveness, adverse immune response

7 Routes of Exposure

8 Attachment

9 Colonization

10 Avoiding the Immune Response

11 Avoiding the Immune Response

12 Tissue Damage: Invasiveness

13 Tissue Damage: Invasion

14 Tissue Damage: The Action of Exotoxins

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18 Infectious vs contagious; Chronological sequence;
Epidemiology Reservoirs of Agents Humans, Animals, Inanimate, Nosocomial Transmission of Agents Contact, Vectors, Vehicles Disease Categories Infectious vs contagious; Chronological sequence; Geographical distribution; Incidence rates; Extent of involvement; Agents; Clinical nature

19 Nosocomial Infections

20 Transmission: How the Microorganisms Spread

21 Portals of Entry: How the agents enter the body

22 Incidence

23 Emerging Diseases

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25 The Immune System Functions of the Immune System
Types of Immune Responses Organization of the Immune System Innate Defense Mechanisms Acquired Defense Mechanisms Applied Immunology A macrophage

26 The Immune System Functions of the Immune System
Defense – Recognition of… Homeostasis – Recognition of… Surveillance – Recognition of… Types of Immune Responses Humoral – Transferred by… Cellular – Transferred by… Innate – First and second line defenses Acquired – “Antigen driven” third line defenses Recognition, Specificity, Memory Organization of the Immune System Innate Defense Mechanisms Acquired Defense Mechanisms Applied Immunology

27 Epithelial Barriers

28 Chemical Barriers

29 The Immune System Functions of the Immune System
Types of Immune Responses Organization of the Immune System Cells: Phagocytes: Neutrophils, macrophages, APC’s Antigen responsive cells: B and T cells Tissues: Primary: Bone marrow, thymus Secondary: Lymph nodes, spleen, diffuse lymphoid tissue Molecules: Enzymes, interferons, complement, interleukins, antibody Innate Defense Mechanisms Acquired Defense Mechanisms Applied Immunology

30 Hematopoiesis

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32 Tissues

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34 The Immune System Innate Defense Mechanisms Phagocytosis Inflammation
Functions of the Immune System Types of Immune Responses Organization of the Immune System Innate Defense Mechanisms Phagocytosis Inflammation Interferon Complement Acquired Defense Mechanisms Applied Immunology

35 Distribution of Phagocytic Cells

36 Phagocytosis

37 Inflammation

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39 Interferon

40 C’

41 The Immune System Acquired Defense Mechanisms
Functions of the Immune System Types of Immune Responses Organization of the Immune System Innate Defense Mechanisms Acquired Defense Mechanisms -Humoral vs cellular specific immunity -The nature of antigens -The nature of antibodies -The functions of antibodies -Clonal selection -Humoral (antibody) immune responses -Cellular immune responses -Natural killer cells Applied Immunology

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43 Antigens

44 Antibodies

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46 Functions of Antibodies

47 Passive Transfer of Antibody

48 Clonal Selection

49 Antibody Production

50 Immunity: -APC’s -Ag Processing -Il-1 Production -Ag Presentation -Th Activation -Il-2 Production -Th Development -Th1 and CMI -Th2 and Antibody -Tc Developement -Tc Killing

51 The Immune System Applied Immunology -Methods of acquiring immunity
Functions of the Immune System Types of Immune Responses Organization of the Immune System Innate Defense Mechanisms Acquired Defense Mechanisms Applied Immunology -Methods of acquiring immunity -Vaccination -Immunological-based testing: ELISA assays -Clinical immunology

52 Figure 17.1

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58 Antimicrobial Chemotherapy
History Ancient, Ehrlich, Domagck Terminology Antibiotics, Synthetic antibiotics, Semi-synthetic antibiotics Properties of Antibiotics Selective toxicity, Therapeutic index, Spectrum of activity Adverse Reactions Toxicity, Allergy, Disrupt normal microbiota, Resistance The Ideal Antibiotic Mechanism of Action Bacteria, Viruses, Fungi, Protozoa, Helminths

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