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Ch. 23 - Microbial Diseases of the Cardiovascular and Lymphatic Systems
Tortora - Microbiology: An Introduction 14th Edition
Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398Not the one you use?Change textbook
All textbooksTortora 14th EditionCh. 23 - Microbial Diseases of the Cardiovascular and Lymphatic SystemsProblem 1
Chapter 23, Problem 1

Show the path of Streptococcus from a focal infection to the pericardium. Identify the portals of entry for T. cruzi, Orthohantavirus, and Cytomegalovirus.
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Begin by understanding the concept of a focal infection: it is a localized infection that can spread to other parts of the body through various routes such as the bloodstream, lymphatic system, or direct extension.
Trace the possible routes Streptococcus can take from a focal infection site to reach the pericardium. This typically involves hematogenous spread (via the bloodstream) or direct extension from nearby infected tissues.
Identify the portals of entry for each pathogen by considering their common modes of transmission: for Trypanosoma cruzi, the portal of entry is usually through the skin via the bite of the triatomine bug or mucous membranes; for Orthohantavirus, entry occurs through inhalation of aerosolized rodent excreta; and for Cytomegalovirus, entry can be through bodily fluids such as saliva, urine, or sexual contact.
Summarize the pathways and portals of entry by linking the biological behavior of each microorganism to its typical infection route and target tissues.
Review the clinical relevance of these pathways, emphasizing how understanding the route of infection helps in diagnosis, treatment, and prevention of diseases caused by these pathogens.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Pathogenesis and Spread of Streptococcus

Understanding how Streptococcus bacteria spread from a focal infection to distant sites like the pericardium involves knowledge of bacterial invasion routes, including hematogenous dissemination and direct extension. This concept explains how localized infections can lead to systemic complications such as pericarditis.
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Portals of Entry for Infectious Agents

Portals of entry are the routes through which pathogens enter the host, such as mucous membranes, skin breaches, or vector bites. Identifying these portals for T. cruzi, Orthohantavirus, and Cytomegalovirus is essential to understand their transmission and initial infection sites.
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Characteristics and Transmission of T. cruzi, Orthohantavirus, and Cytomegalovirus

Each pathogen has unique transmission modes: T. cruzi is transmitted via triatomine bug feces entering through skin or mucosa; Orthohantavirus enters through inhalation of aerosolized rodent excreta; Cytomegalovirus spreads mainly via bodily fluids and infects through mucosal surfaces. Recognizing these helps in identifying their portals of entry.
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Related Practice
Textbook Question

Use the following choices to answer the question given below:

a. Ehrlichiosis

b. Lyme disease

c. Septic shock

d. Toxoplasmosis

e. Viral hemorrhagic fever

A patient was hospitalized because of continuing fever and progression of symptoms including headache, fatigue, and back pain. Tests for antibodies to B. burgdorferi were negative. What is your diagnosis?

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Textbook Question

Use the following choices to answer the question given below:

a. Ehrlichiosis

b. Lyme disease

c. Septic shock

d. Toxoplasmosis

e. Viral hemorrhagic fever

A patient presents with a history of fever and headache. Bacterial cultures of blood, CSF, and stool are negative. What is your diagnosis?

759
views
Textbook Question

Complete the following table.

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