25 Questions
What is the primary condition for non-invasive bacteria to cause diseases?
When they transfer to other body sites or tissues outside their normal intestinal sites
What is the result of localized clinically important infections?
The bacteria reach the bloodstream and cause sepsis
What is a characteristic of non-invasive bacteria?
They cause diseases only when they transfer to other body sites or tissues
What is a consequence of inadequate host defenses?
Localized clinically important infections can result
What is the relationship between non-invasive bacteria and the bloodstream?
The bacteria can reach the bloodstream and cause sepsis
What is a possible complication of syphilis in the patient?
Nephritis
What is the course of secondary lesions in patients with syphilis?
They subside spontaneously
What is a rare but possible complication of syphilis?
Chorioretinitis
What is a possible manifestation of syphilis in the liver?
Hepatitis
What is a possible complication of syphilis in the bones?
Periostitis
What is the primary reason why Treponema pallidum cannot be investigated using conventional lab techniques?
It is a strictly intracellular pathogen.
Why is it impossible to culture Treponema pallidum in a laboratory setting?
It can only survive within a mammalian host cell.
What is a characteristic of Treponema pallidum that makes it difficult to study?
It is a bacterium that cannot survive outside of a mammalian host cell.
Why is it necessary to use non-conventional methods to study Treponema pallidum?
It is a bacterium that cannot survive outside of a mammalian host cell.
What is a limitation of studying Treponema pallidum in a laboratory setting?
It is a bacterium that can only be studied in its natural host.
What is the primary mechanism by which oral bacteria enter the bloodstream?
Following tooth extraction or other traumas
What is the term for the inflammation of the inner lining of the heart, which can be caused by oral bacteria in the bloodstream?
Endocarditis
What is the term for a localized collection of pus that can occur in distant organs as a result of oral bacteria in the bloodstream?
Abscess
Which of the following is NOT a common site for oral bacteria to enter the bloodstream?
Gastrointestinal tract
What is the primary reason why oral bacteria are not typically found in distant organs?
The immune system is effective at eliminating them
What is the primary function of teeth in relation to microorganisms?
To allow the accumulation of large masses of microorganisms
What is the composition of dental plaque?
Predominantly bacteria and their extracellular products
What is the term used to describe the accumulation of microorganisms on teeth and dentures?
Dental plaque
What is a characteristic of the microorganisms that accumulate on teeth and dentures?
They are predominantly bacteria
What is the result of the accumulation of microorganisms on teeth and dentures?
Formation of dental plaque
Study Notes
Non-invasive Bacteria
- Non-invasive bacteria cause diseases only when they transfer to other body sites or tissues outside their normal intestinal sites or other less common intestinal sites.
Infections and Complications
- When normal host defenses are inadequate, localized clinically important infections can result, leading to sepsis.
- The bacteria may cause secondary lesions, such as syphilitic meningitis, chorioretinitis, hepatitis, nephritis, or periostitis.
- These secondary lesions can subside spontaneously.
Characteristics of Treponema Pallidum
- Treponema pallidum cannot be cultured in the lab because it cannot survive outside of mammalian cells.
- As a result, it cannot be investigated using conventional lab techniques.
Microorganisms and Disease
- The presence of microorganisms at sites not normally accessible to them can cause disease, such as when oral bacteria enter the blood stream following tooth extraction or other traumas.
- This can lead to abscesses or endocarditis in distant organs.
Dental Plaque and Microorganisms
- Teeth (and dentures) allow the accumulation of large masses of microorganisms (predominantly bacteria) and their extracellular products.
- These accumulated microorganisms and products are termed dental plaque.
This quiz covers non-invasive bacteria that cause diseases when they transfer to other body sites or tissues, and the infections and complications that can result.
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