Microbiology: Non-invasive Bacteria Infections

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Questions and Answers

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 (correct)

When the host's immune system is overly active

When they are in a dormant state

When they are in their normal intestinal sites

What is the result of localized clinically important infections?

The host's immune system becomes stronger

The bacteria become invasive

The bacteria are eliminated from the body

The bacteria reach the bloodstream and cause sepsis (correct)

What is a characteristic of non-invasive bacteria?

They can cause disease in their normal intestinal sites

They cause diseases only when they transfer to other body sites or tissues (correct)

They are always pathogenic

They are never found in the bloodstream

What is a consequence of inadequate host defenses?

Localized clinically important infections can result Signup and view all the answers

What is the relationship between non-invasive bacteria and the bloodstream?

The bacteria can reach the bloodstream and cause sepsis Signup and view all the answers

What is a possible complication of syphilis in the patient?

Nephritis Signup and view all the answers

What is the course of secondary lesions in patients with syphilis?

They subside spontaneously Signup and view all the answers

What is a rare but possible complication of syphilis?

Chorioretinitis Signup and view all the answers

What is a possible manifestation of syphilis in the liver?

Hepatitis Signup and view all the answers

What is a possible complication of syphilis in the bones?

Periostitis Signup and view all the answers

What is the primary reason why Treponema pallidum cannot be investigated using conventional lab techniques?

It is a strictly intracellular pathogen. Signup and view all the answers

Why is it impossible to culture Treponema pallidum in a laboratory setting?

It can only survive within a mammalian host cell. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

What is the primary mechanism by which oral bacteria enter the bloodstream?

Following tooth extraction or other traumas Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

Which of the following is NOT a common site for oral bacteria to enter the bloodstream?

Gastrointestinal tract Signup and view all the answers

What is the primary reason why oral bacteria are not typically found in distant organs?

The immune system is effective at eliminating them Signup and view all the answers

What is the primary function of teeth in relation to microorganisms?

To allow the accumulation of large masses of microorganisms Signup and view all the answers

What is the composition of dental plaque?

Predominantly bacteria and their extracellular products Signup and view all the answers

What is the term used to describe the accumulation of microorganisms on teeth and dentures?

Dental plaque Signup and view all the answers

What is a characteristic of the microorganisms that accumulate on teeth and dentures?

They are predominantly bacteria Signup and view all the answers

What is the result of the accumulation of microorganisms on teeth and dentures?

Formation of dental plaque Signup and view all the answers

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.

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Description

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.