Textbook Question
Label inclusion, elementary, and reticulate bodies of Chlamydia: <IMAGE>
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Ch. 21 - Rickettsias, Chlamydias, Spirochetes, and Vibrios
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302
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Table of contents
- Ch. 1 - A Brief History of Microbiology31
- Ch. 2 - The Chemistry of Microbiology28
- Ch. 3 - Cell Structure and Function39
- Ch. 4 - Microscopy, Staining, and Classification25
- Ch. 5 - Microbial Metabolism51
- Ch. 6 - Microbial Nutrition and Growth37
- Ch. 7 - Microbial Genetics51
- Ch. 8 - Recombinant DNA Technology21
- Ch. 9 - Controlling Microbial Growth in the Environment36
- Ch. 10 - Controlling Microbial Growth in the Body: Antimicrobial Drugs21
- Ch. 11 - Characterizing and Classifying Prokaryotes29
- Ch. 12 - Characterizing and Classifying Eukaryotes34
- Ch. 13 - Characterizing and Classifying Viruses, Viroids, and Prions23
- Ch. 14 - Infection, Infectious Diseases, and Epidemiology35
- Ch. 15 - Innate Immunity34
- Ch. 16 - Adaptive Immunity21
- Ch. 17 - Immunization and Immune Testing29
- Ch. 18 - Immune Disorders22
- Ch. 19 - Pathogenic Gram-Positive Bacteria25
- Ch. 20 - Pathogenic Gram-Negative Cocci and Bacilli28
- Ch. 21 - Rickettsias, Chlamydias, Spirochetes, and Vibrios25
- Ch. 22 - Pathogenic Fungi47
- Ch. 23 - Parasitic Protozoa, Helminths, and Arthropod Vectors44
- Ch. 24 - Pathogenic DNA Viruses23
- Ch. 25 - Pathogenic RNA Viruses30
- Ch. 26 - Applied and Industrial Microbiology29
- Ch. 27 - Microbial Ecology and Microbiomes22
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302Not the one you use?Change textbook
Chapter 21, Problem 2
The bacterium that causes spotted fever rickettsiosis (RMSF) is more likely to infect a human ______________.
a. If an infected tick feeds for several hours
b. When an infected tick initially penetrates the skin
c. When contaminated tick feces dry and become airborne
d. If the human is exposed to rodent feces containing the bacterium
Verified step by step guidance1
Step 1: Understand the disease transmission mechanism of Rocky Mountain spotted fever (RMSF), which is caused by the bacterium Rickettsia rickettsii.
Step 2: Recognize that RMSF is primarily transmitted through the bite of an infected tick, specifically when the tick remains attached and feeds on the human host.
Step 3: Note that the bacterium is not typically transmitted immediately upon tick attachment; it requires the tick to feed for a certain period to transmit the pathogen effectively.
Step 4: Eliminate options that involve transmission through airborne particles or rodent feces, as these are not common routes for RMSF infection.
Step 5: Conclude that the most likely scenario for infection is when an infected tick feeds for several hours, allowing the bacterium to enter the human bloodstream.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Transmission Mechanism of Rickettsia rickettsii
Rickettsia rickettsii, the bacterium causing Rocky Mountain spotted fever (RMSF), is primarily transmitted through the bite of infected ticks. The bacterium enters the human host when an infected tick feeds for several hours, allowing the pathogen to move from the tick’s salivary glands into the bloodstream.
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Introduction to Avoiding Host Defense Mechanisms
Role of Tick Feeding Duration in Infection
The duration of tick attachment is critical for transmission; Rickettsia rickettsii typically requires several hours of tick feeding to be transmitted effectively. Early removal of ticks reduces the risk of infection because the bacteria need time to migrate from the tick to the host.
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Differences Between Transmission Routes of Rickettsial Diseases
Not all rickettsial diseases transmit the same way; for RMSF, airborne transmission or contact with rodent feces is not a common route. Instead, direct tick bite and prolonged feeding are essential, distinguishing RMSF from other diseases like typhus, which may involve contaminated feces.
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Related Practice
Textbook Question
Label the following stages and structures of the chlamydia life cycle: elementary body, endocytosis, vesicle, host cell, inclusion body, reticulate body. For B–D, indicate how many hours have typically transpired since infection. <IMAGE>
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Textbook Question
Most human infections caused by species of Rickettsia ___________.
a. Are acquired from fomites
b. Could be prevented by hand washing
c. Are transmitted via vectors
d. Are sexually transmitted
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Textbook Question
Match the disease with the causative pathogen in the list.
___ Spotted fever rickettsiosis
___ Murine typhus
___ Epidemic typhus
___ Scrub typhus
___ Ehrlichiosis
A. Rickettsia typhi
B. Rickettsia prowazekii
C. Rickettsia rickettsii
D. Orientia tsutsugamushi
E. Ehrlichia chaffeensis
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Textbook Question
Describe the three developmental stages of the bacteria Ehrlichia and Anaplasma.
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Textbook Question
Match the pathogen with the listed vector responsible for transmitting it to humans.
___ Rickettsia typhi
___ Rickettsia prowazekii
___ Rickettsia rickettsii
___ Orientia tsutsugamushi
___ Ehrlichia chaffeensis
___ Borrelia burgdorferi
___ Borrelia recurrentis
___ Anaplasma phagocytophilum
A. Rat flea
B. Body louse
C. Hard tick
D. Mite
E. Soft tick
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