Host-Parasite Relationship
• Normal Flora• Pathogens• Infections• Opportunistic• pathogens
Skin Flora
• 180 species• Streptococcus• Staphylococcus• Propionibacterium• Body Odor• Acne
Oral Cavity Flora
• Plaque• Anaerobes• Biofilms• Dental Caries• Streptococcus
mutans, sobrinus• Sucrose
Tongue
Intestinal Tract
• Stomach – pH • Helicobacter pylori
• Small Intestine• Enterococci, Lactobacilli
Large intestine
• 1010-1011 cells/gm• Bacteroides• Enterobacteria
•Escherichia coli•Enterococcus
Large Intestine Flora
•Methanogens•Food passage 24 hrs•Excrete 1013/day•Probiotics•Fecal transplant
Respiratory Tract
• Staphylococcus aureus
• Streptococcus pneumoniae
• S. pyogenes• Corynebacterium
diphtheriae• Carrier
Opportunistic Pathogens
E. coli
Virulence
Invasiveness
Toxicity
Lactobacillus acidophilus
Urogenital Tract
Adherence
• Specific Adherence• Capsule• Slime Layer• Glycocalyx• Fimbriae• Pili - longer
Invasiveness
• Colonization Factor Antigen
• Invasion• Colonization• Iron- Siderophore• Bacteremia vs.
Septicemia
Enzymes & Toxins
• Coagulase• Collagenase• Exotoxins• Cytolytic Toxins• Hemolysins, Leukocidins• Diphtheria Toxin• Botulism Toxin• Tetanus Toxin
Tetanus
Enterotoxin
Cholera toxin
Endotoxin – Pyrogen
LD50
Virulence Factors
Attenuated Strains
Other Toxins
Pyrogen free Products
Virulence Factors
Nonspecific Host Defense
• Natural Resistance• Age• Stress• Diet• Anatomical
Defenses• Skin, Stomach,
Tears
Compromised Hosts
Inflammation
Fever
Nosocomial Infections
Host-Parasite Word List
Normal Flora
Pathogens
Infection
Skin Flora
Staphylococcus, Propionibacterium
Oral Cavity Flora
Plaque
Streptococcus spp
Dental Caries
Streptococcus mutans
Intestinal Tract
Stomach – pH2
Helicobacter pylori
Small Intestine
Enterococci, Lactobacilli
Large Intestine
1010- 1011 cells/gram
Host-Parasite Word List 2
1010- 1011 cells/gram
Bacteroides, Enterobacteria,
Escherichia coli, Enterococcus
Respiratory Tract
Staphylococcus aureus,
Streptococcus pneumoniae,
S. pyogenes, Corynebacterium diphtheriae
Carrier
Urogenital Tract
Opportunistic Pathogens
Virulence
Invasiveness, Toxicity
Specific Adherence
Host-Parasite Word List 3
Capsule, Glycocalyx,
Slime Layer
Fimbriae, Pili
Colonization Factor Antigen
Invasion
Colonization
Iron – Siderophore
Bacteremia – Septicemia
Enzymes & Toxins
Coagulase, Collagenase
Exotoxins
Cytolytic Toxins
Hemolysins, Leukocidins
Host-Parasite Word List 4
Diphtheria Toxin
Botulism Toxin
Tetanus Toxin
Enterotoxin
Cholera Toxin
Endotoxin
LD50
Attenuated
Nonspecific Host Defenses
Natural Resistance
Natural Resistance
Age, Stress, Diet
Anatomical Defenses
Skin, Stomach, Tears
Host-Parasite Word List 5
Compromised Host
Inflammation
Fever
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