Chapter 14 and 15 Normal Flora and Microbial Diseases

Chapter 14 and 15 Normal Flora and Microbial Diseases -...

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Chapter 14 and 15 Normal Flora and Microbial Diseases (Tortora) Humans live in a dynamic relationship with microbes of which are harmless but some have potential to cause disease. Pathogen: is a microbe that can cause disease in a susceptible host. Pathology: is the scientific study of disease. Disease: any change from a state of health. Infection: is the colonization of the body by pathogenic microorganisms. Normal flora / Normal microbiota Microorganisms that colonize an animal without causing a disease. Over 100 microbial species are regarded as the normal flora of the adult human. Examples: Skin: 1. Propionibacterium acnes 2. Staphylococcus epidermitis 3. Corynebacterium xerosis 4. Candida species Eyes: 1. Diphthroids Nose, throat, and upper respiratory system: Same as eyes plus 1. Streptococcus pneumoniae 2. Hemophilus and Neisseria species in the throat Mouth: Various species of Streptococcus, 1
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Actinomyces, Bacteroids, Candida Large intestine: Various species of enterobacter, Enterococcus, Citrobacter, Proteus, Klebsiella, Escherichia Urinary and genital systems: S. epidermitis, Lactobacillus, Proteus, Candida, Enterococcus Origin of normal flora A healthy fetus is free of foreign organisms until the birth membranes break and it is exposed to the flora of the mother’s vagina. The newborn is then exposed to the flora of: 1. Mother’s breast and skin 2. Hand’s of those who care for him 3. Air A fetus can be infected by pathogens during the birth process. Examples of congenital diseases include: gonorrhea, AIDS, and syphilis. HIV cannot pass through placenta unless internal injury
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Chapter 14 and 15 Normal Flora and Microbial Diseases -...

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