Explanation There are various routes through which microbes may enter. These include the skin, gastrointestinal tract, respiratory tract, and urogenital tract. Vehicles that carry pathogens in each portal of entry are as follows: Skin: The skin is a very common portal of entry. The actual sites of entry are usually nicks, abrasions, and punctures (many of which are tiny and inapparent) rather than smooth, unbroken skin. Staphylococcus aureus (the cause of boils), Streptococcus pyogenes (an agent of impetigo), the fungal dermatophytes, and agents of gangrene and tetanus gain access through damaged skin. The cold sore virus (herpes simplex) enters through the mucous membranes near the lips. Gastrointestinal tract: The gastrointestinal tract is the portal of entry for pathogens contained in food, drink, and other ingested substances. These pathogens are adapted to survive digestive enzymes and abrupt pH changes. Most enteric pathogens possess specialized mechanisms for entering and localizing in the mucosa of the small or large intestine. The best-known enteric agents of disease are gram-negative rods in the genera Salmonella, Shigella, and Vibrio and in certain strains of Escherichia coli...

9th Edition

ISBN: 9780073522609

Author: Kathleen Park Talaro, Barry Chess Instructor

Publisher: McGraw-Hill Education

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Chapter 13.L1, Problem 5WC

Summary Introduction

Introduction:

To initiate an infection, a microbe enters the tissues of the body by a characteristic route, called the portal of entry. It is usually some sort of cutaneous or membranous boundary.

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Chapter 13.L1, Problem 4WC

Chapter 13.L1, Problem 6WC

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To initiate an infection, a microbe enters the tissues of the body by a characteristic route, called the portal of entry. It is usually some sort of cutaneous or membranous boundary.

Solution Summary: The author explains the various pathways through which microbes enter the body, including skin, gastrointestinal tract, respiratory tract and urogenital tract.

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Introduction: To initiate an infection, a microbe enters the tissues of the body by a characteristic route, called the portal of entry. It is usually some sort of cutaneous or membranous boundary.

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Chapter 13 Solutions

Introduction:

To initiate an infection, a microbe enters the tissues of the body by a characteristic route, called the portal of entry. It is usually some sort of cutaneous or membranous boundary.