Classical and Polymicrobial Infections

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary characteristic of a classical infection?

  • It is caused by a single organism (correct)
  • It involves multiple microorganisms
  • It is caused by an exogenous source
  • It involves a mixture of bacteria and viruses

What is the mechanism by which bacteria adhere to lung tissue in secondary infections?

  • The bacterial neuraminidase cleaves sialic acid residues on host cells (correct)
  • The host immune response produces antibodies against the bacteria
  • The bacteria produce toxins that disrupt the host cell membrane
  • The viral protease cleaves bacterial cell walls

What is an example of a primary infection?

  • Bronchitis
  • Anthrax
  • Influenza (correct)
  • Pneumonia

What is the main trigger for secondary infections?

<p>Viral infection (B)</p> Signup and view all the answers

What is the final step in the mechanism of a classical infection?

<p>The organism produces protein toxins (B)</p> Signup and view all the answers

What is an example of a polymicrobial infection?

<p>A combination of bacteria and viruses (A)</p> Signup and view all the answers

What is the result of dysbiosis and pathogenic biofilm formation?

<p>Formation of a diabetic foot ulcer (B)</p> Signup and view all the answers

What type of polymicrobial interaction leads to quorum sensing?

<p>Chemical interactions (C)</p> Signup and view all the answers

What is the role of adhesins in co-aggregation?

<p>To attach genetically distinct bacteria to each other (B)</p> Signup and view all the answers

What is the result of Candida albicans and S. aureus co-aggregation in denture stomatitis?

<p>Systemic bacterial infection (C)</p> Signup and view all the answers

What is the effect of farnesol on Candida albicans?

<p>It inhibits filamentation (D)</p> Signup and view all the answers

What is the purpose of digestive consortiums?

<p>To acquire nutrients through microbial co-operation (D)</p> Signup and view all the answers

How can some microbes survive in harsh lethal environments?

<p>By persisting as part of a polymicrobial community (C)</p> Signup and view all the answers

What is the minimum requirement for polymicrobial co-operation in a dental abscess?

<p>A minimum of 6-8 species (D)</p> Signup and view all the answers

What is the drawback of using 16S rRNA Next-Generation Sequencing and OTU determination to detect microbes?

<p>It can only identify the genus, not the species (D)</p> Signup and view all the answers

Why is the outcome of treatment to polymicrobial infections difficult to predict?

<p>Because polymicrobial communities display many complex phenotypes with multiple virulence factors (D)</p> Signup and view all the answers

What is the primary consequence of an overactive immune system in response to a viral infection?

<p>Overproduction of inflammatory cytokines (C)</p> Signup and view all the answers

What is the primary reason why antibiotics are not recommended to treat viral diseases?

<p>Antibiotics don't actually kill the virus, and increase levels of antibiotic resistance (D)</p> Signup and view all the answers

What is the term for the matrix-enclosed population of microbes that can adhere to biotic and abiotic substrates?

<p>Biofilm (D)</p> Signup and view all the answers

What is the primary mechanism by which primary colonizers interact with the conditioning film in biofilm development?

<p>Electrostatic attraction (A)</p> Signup and view all the answers

What is the term for the process by which a mature multi-species biofilm develops from a primary colonizer?

<p>Succession (A)</p> Signup and view all the answers

What is the primary component of enamel that starts the development of plaque biofilm?

<p>Hydroxyapatite (C)</p> Signup and view all the answers

What are the primary benefits of bacteria growing in a biofilm?

<p>Increased metabolic fitness, increased genomic diversity, increased stress resistance, and recalcitrance (B)</p> Signup and view all the answers

What is the primary consequence of changes in biofilm composition?

<p>Dysbiosis (D)</p> Signup and view all the answers

What is the primary mechanism by which periodontitis occurs?

<p>Subtle changes in the composition of microbiota lead to gingivitis, which stabilizes into periodontitis (D)</p> Signup and view all the answers

What is the primary consequence of high blood sugar in diabetic patients?

<p>Reduced blood flow and chronic inflammation (D)</p> Signup and view all the answers

Flashcards

Biofilm

A multi-species microbial community enclosed within a matrix that adheres to biotic and abiotic surfaces.

Succession

The process by which a mature multi-species biofilm develops from a single primary colonizer.

Electrostatic attraction

The process by which bacteria, specifically primary colonizers, interact with the conditioning film on a surface during biofilm development.

Classical infection

A single organism causing an infection.

Signup and view all the flashcards

Bacterial Neuraminidase

The mechanism by which bacteria adhere to lung tissue in secondary infections.

Signup and view all the flashcards

Single organism infection

An infection caused by a single organism.

Signup and view all the flashcards

Primary infection

A viral infection that triggers secondary infections.

Signup and view all the flashcards

Toxin production

The final stage of a classical infection, where the organism releases protein toxins.

Signup and view all the flashcards

Polymicrobial infection

An infection caused by multiple different microorganisms.

Signup and view all the flashcards

Quorum sensing

The process by which bacteria secrete signaling molecules to communicate with each other.

Signup and view all the flashcards

Co-aggregation

The ability of genetically distinct bacteria to adhere to each other.

Signup and view all the flashcards

Adhesins

The proteins on bacterial surfaces that help them attach to other bacteria.

Signup and view all the flashcards

Candida albicans and S. aureus co-aggregation

A combination of Candida albicans and S. aureus causing denture stomatitis.

Signup and view all the flashcards

Farnesol

The molecule that inhibits filamentation of Candida albicans.

Signup and view all the flashcards

Digestive consortiums

A group of microbes working together to acquire nutrients through a complex food web.

Signup and view all the flashcards

Polymicrobial survival

The ability of microbes to survive in harsh environments by forming polymicrobial communities.

Signup and view all the flashcards

Polymicrobial co-operation minimum

The minimum number of species required for polymicrobial co-operation.

Signup and view all the flashcards

16S rRNA sequencing limitation

The limitation of 16S rRNA Next-Generation Sequencing because it can only identify the genus, not the species of bacteria.

Signup and view all the flashcards

Polymicrobial infection treatment difficulty

The difficulty in predicting treatment outcomes for polymicrobial infections due to complex interactions and virulence factors.

Signup and view all the flashcards

Cytokine storm

The primary consequence of an overactive immune system in response to a viral infection.

Signup and view all the flashcards

Antibiotic inefficacy against viruses

The reason antibiotics are not used to treat viral infections.

Signup and view all the flashcards

Hydroxyapatite

The primary component of enamel that starts the development of plaque biofilm.

Signup and view all the flashcards

Biofilm benefits

The benefits of bacteria growing in biofilms.

Signup and view all the flashcards

Dysbiosis

The primary consequence of changes in biofilm composition.

Signup and view all the flashcards

Periodontitis development

The process by which subtle changes in microbiota lead to inflammation in the gums, eventually progressing into periodontitis.

Signup and view all the flashcards

Diabetic complications

The primary consequence of high blood sugar in diabetic patients, affecting both blood flow and inflammation.

Signup and view all the flashcards

More Like This

Lecture 12: Infection Types Part 1
30 questions
Types of Viral Diseases
8 questions
Infection and Disease Types
5 questions
Use Quizgecko on...
Browser
Browser