Textbook Question
The most severe rickettsial illness is caused by __________.
a. Rickettsia typhi
b. Rickettsia rickettsii
c. Orientia tsutsugamushi
d. Ehrlichia chaffeensis
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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
Label inclusion, elementary, and reticulate bodies of Chlamydia: <IMAGE>
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Understand the life cycle of Chlamydia, which includes two main forms: the elementary body (EB) and the reticulate body (RB). The elementary body is the infectious, extracellular form, while the reticulate body is the non-infectious, intracellular replicative form.
Identify the elementary body (EB) in the image as the small, dense, infectious particle that can survive outside host cells and initiate infection by attaching to and entering host cells.
Locate the reticulate body (RB) in the image as the larger, less dense form found inside host cells, where it replicates by binary fission.
Recognize the inclusion body as the membrane-bound vacuole inside the host cell that contains multiple reticulate bodies during the replication phase.
Label each structure accordingly: mark the elementary bodies as infectious particles outside or at the periphery of the inclusion, the reticulate bodies inside the inclusion, and the inclusion body as the vacuole containing the reticulate bodies within the host cell cytoplasm.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Chlamydia Developmental Cycle
Chlamydia undergoes a unique biphasic developmental cycle alternating between infectious elementary bodies (EBs) and replicative reticulate bodies (RBs). EBs are metabolically inactive but infectious, while RBs are metabolically active and divide within host cells. Understanding this cycle is essential to grasp the pathogen's survival and infection mechanisms.
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Krebs Cycle
Elementary Bodies (EBs)
Elementary bodies are the small, dense, infectious form of Chlamydia that can survive outside host cells. They attach to and enter host cells, initiating infection. EBs are metabolically inert but transform into reticulate bodies once inside the host cell to replicate.
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Reticulate Bodies (RBs)
Reticulate bodies are the larger, metabolically active, non-infectious form of Chlamydia that replicate by binary fission inside the host cell's inclusion. After replication, RBs convert back into EBs to be released and infect new cells. RBs are critical for bacterial growth and propagation.
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Related Practice
Textbook Question
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
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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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