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Ch. 20 - Pathogenic Gram-Negative Cocci and Bacilli
Bauman - Microbiology with Diseases by Taxonomy 6th Edition
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBauman 6th EditionCh. 20 - Pathogenic Gram-Negative Cocci and BacilliProblema 10
Capitolo 20, Problema 10

What attribute of Coxiella burnetii enables it to survive desiccation and heat for an extended time?

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Understand that Coxiella burnetii is a bacterium known for its ability to survive harsh environmental conditions, including desiccation and heat.
Recognize that this survival ability is linked to a specific structural form or adaptation that protects the bacterium from damage.
Identify that Coxiella burnetii produces a spore-like form called a small cell variant (SCV), which is highly resistant to environmental stresses.
Note that the SCV has a dense cell wall and reduced metabolic activity, which contribute to its resistance to desiccation and heat.
Conclude that the attribute enabling Coxiella burnetii to survive these conditions is its formation of the small cell variant, a spore-like, environmentally resistant form.

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Spore Formation and Resistance

Coxiella burnetii produces a spore-like form called the small cell variant (SCV), which is highly resistant to environmental stresses such as desiccation and heat. This form allows the bacterium to survive harsh conditions outside a host for extended periods.
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Cell Envelope Structure

The unique cell envelope of Coxiella burnetii, including a thick, protective outer membrane, contributes to its durability. This structure helps prevent damage from physical and chemical stresses, enhancing its ability to withstand heat and drying.
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Cell Envelope & Biological Membranes Example 1

Intracellular Lifestyle and Adaptation

Coxiella burnetii is an obligate intracellular pathogen adapted to survive within acidic phagolysosomes of host cells. Its adaptations to harsh intracellular environments also confer resilience to external environmental stresses like heat and desiccation.
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Introduction to Adaptive Immunity
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