Question 1

Which factors may result in a normal microbiota species causing disease?

Accepted Answer

A)  dysbiosis due to antibiotic therapy or invasion of other tissues by the microbiota species 
B)  immune system attack on the host's own tissues 
C)  dysbiosis due to antibiotic therapy 
D)  dysbiosis due to antibiotic therapy or immune system attack on the host's own tissue 
E)  invasion of other tissues by the microbiota species 
A)  dysbiosis due to antibiotic therapy or invasion of other tissues by the microbiota species 
B)  immune system attack on the host's own tissues 
C)  dysbiosis due to antibiotic therapy 
D)  dysbiosis due to antibiotic therapy or immune system attack on the host's own tissue 
E)  invasion of other tissues by the microbiota species

Question 2

An attenuated pathogen

Accepted Answer

A)  is part of the normal human microbiome. 
B)  has lost virulence factors needed to cause disease in an immune competent host. 
C)  has recently acquired virulence factors allowing it to jump species. 
D)  has become antibiotic- resistant. 
E)  produces toxins. 
A)  is part of the normal human microbiome. 
B)  has lost virulence factors needed to cause disease in an immune competent host. 
C)  has recently acquired virulence factors allowing it to jump species. 
D)  has become antibiotic- resistant. 
E)  produces toxins.

Question 3

Which factor is responsible for many emerging pathogens in humans?

Accepted Answer

A)  expanded host or tissue range of the pathogen 
B)  increased use of antibiotics in the past half- century 
C)  longer life spans resulting in a larger elderly population 
D)  improved sanitation and hygiene practices 
E)  availability of vaccines 
A)  expanded host or tissue range of the pathogen 
B)  increased use of antibiotics in the past half- century 
C)  longer life spans resulting in a larger elderly population 
D)  improved sanitation and hygiene practices 
E)  availability of vaccines

Question 4

How are symptoms of an infection associated with the mode of transmission of the pathogen?

Accepted Answer

A)  Lack of symptoms indicates that the infection is not transmissible to others. 
B)  The worse the patient feels, the more likely the disease is transmissible to others. 
C)  There is no relationship between symptoms and mode of transmission. 
D)  Bodily fluids produced during an illness are often rich in infectious organisms. 
E)  Bodily fluids are rarely a source of disease transmission during an infection. 
A)  Lack of symptoms indicates that the infection is not transmissible to others. 
B)  The worse the patient feels, the more likely the disease is transmissible to others. 
C)  There is no relationship between symptoms and mode of transmission. 
D)  Bodily fluids produced during an illness are often rich in infectious organisms. 
E)  Bodily fluids are rarely a source of disease transmission during an infection.

Question 5

Which statement shows an example of a commensal species in one host becoming a pathogenic species in another host?

Accepted Answer

A)  C. difficile flourishes in the large intestine after antibiotic therapy. 
B)  New infectious diseases are due to increases in host tropism. 
C)  Shigella flexneri preferably infects the tissues of humans and other primates. 
D)  E. coli lives harmlessly in the appendix but will be attacked by the immune system if it invades the abdominal cavity. 
E)  Up to 30% of pregnant women harbor Group B streptococci in the vagina to no ill effect, but when transmitted to their newborns, a proportion of babies develop serious infection. 
A)  C. difficile flourishes in the large intestine after antibiotic therapy. 
B)  New infectious diseases are due to increases in host tropism. 
C)  Shigella flexneri preferably infects the tissues of humans and other primates. 
D)  E. coli lives harmlessly in the appendix but will be attacked by the immune system if it invades the abdominal cavity. 
E)  Up to 30% of pregnant women harbor Group B streptococci in the vagina to no ill effect, but when transmitted to their newborns, a proportion of babies develop serious infection.

Question 6

The degree or extent of disease that a pathogen causes is

Accepted Answer

A)  virulence. 
B)  toxicity. 
C)  a host factor. 
D)  attenuation. 
E)  pathogenicity. 
A)  virulence. 
B)  toxicity. 
C)  a host factor. 
D)  attenuation. 
E)  pathogenicity.

Which factors may result in a normal microbiota species causing disease?

An attenuated pathogen

Which factor is responsible for many emerging pathogens in humans?

How are symptoms of an infection associated with the mode of transmission of the pathogen?

Which statement shows an example of a commensal species in one host becoming a pathogenic species in another host?

The degree or extent of disease that a pathogen causes is

Introduction to Microbiology

Biochemistry Basics

Introduction to Prokaryotic Cells

Introduction to Eukaryotic Cells

Genetics

Viruses and Prions

Fundamentals of Microbial Growth

Microbial Metabolism

Principles of Infectious Disease and Epidemiology

Innate Immunity

Adaptive Immunity

Immune System Disorders

Vaccines and Biotechnology-Based Diagnostics and Therapeutics

Antimicrobial Drugs

Respiratory System Infections

Skin and Eye Infections

Nervous System Infections

Digestive System Infections

Urinary and Reproductive System Infections

Cardiovascular and Lymphatic Infections

Filters

Exam 10: Host-Microbe Interactions and Pathogenesis

Which factors may result in a normal microbiota species causing disease?

An attenuated pathogen

Which factor is responsible for many emerging pathogens in humans?

How are symptoms of an infection associated with the mode of transmission of the pathogen?

Which statement shows an example of a commensal species in one host becoming a pathogenic species in another host?

The degree or extent of disease that a pathogen causes is

Introduction to Microbiology

Biochemistry Basics

Introduction to Prokaryotic Cells

Introduction to Eukaryotic Cells

Genetics

Viruses and Prions

Fundamentals of Microbial Growth

Microbial Metabolism

Principles of Infectious Disease and Epidemiology

Innate Immunity

Adaptive Immunity

Immune System Disorders

Vaccines and Biotechnology-Based Diagnostics and Therapeutics

Antimicrobial Drugs

Respiratory System Infections

Skin and Eye Infections

Nervous System Infections

Digestive System Infections

Urinary and Reproductive System Infections

Cardiovascular and Lymphatic Infections

Filters