Question 1

A phenotypic technique that examines an organism's susceptibility to bacterial peptides (proteins)is:

Accepted Answer

Classic phenotypic techniques include biotyping (analyzing unique biologic or biochemical characteristics),antibiograms (analyzing antimicrobial susceptibility patterns),and serotyping (serologic typing of bacterial or viral antigens,such as bacterial cell wall [O] antigens).Bacteriocin typing,which examines an organism's susceptibility to bacterial peptides (proteins),and bacteriophage typing,which examines the ability of bacteriophages (viruses capable of infecting and lysing bacterial cells)to attack certain strains,have been useful for typing P.aeruginosa and S.aureus,respectively.These techniques,however,are not widely available.

Question 2

An infection acquired by a hospitalized patient that was not present when he or she entered the hospital is referred to as a(n)_____ infection.

Accepted Answer

Nosocomial infections are those that patients acquire while in the hospital setting.

Question 3

The classification of a surgical wound as dirty refers to a:

Accepted Answer

Surgical wounds are classified as clean,clean-contaminated,contaminated,or dirty,depending on the number of contaminating organisms at the site.Bowel surgery is considered dirty,for example,whereas surgery for a total hip replacement is considered clean.

Question 4

Surveillance cultures are in place to monitor infections implicated in cooling towers or hot water sources.Health care professionals are interested in limiting outbreaks with which organism in water supplies?

Accepted Answer

Certain surveillance cultures are still performed as a method of limiting outbreaks.These include culturing cooling towers or hot water sources for Legionella spp. ;culture of water and dialysis fluids for hemodialysis,as well as endotoxin testing;culture of blood bank products,especially platelets;and surveillance cultures for vancomycin-resistant enterococci (VRE),methicillin- or oxacillin-resistant S.aureus (MRSA),and vancomycin-resistant S.aureus (VRSA)using rectal and oropharyngeal swabs.

Question 5

A patient should be placed in a private room that has monitored negative air pressure if he or she is infected with which organism?

Accepted Answer

Patients with M.tuberculosis should be placed in a private room that has monitored negative air pressure,6 to 12 air changes per hour,and appropriate discharge of air outdoors or monitored high-efficiency particulate air (HEPA)filtration of room air before the air is circulated to other areas of the hospital or before placing patients with the same infection in the same room if private rooms are not available.

Question 6

A phenotypic technique of typing microbial strains that consists of analyzing antimicrobial susceptibility patterns of the organism of interest is:

Accepted Answer

Classic phenotypic techniques include antibiograms (analyzing antimicrobial susceptibility patterns),biotyping (analyzing unique biologic or biochemical characteristics),and serotyping (serologic typing of bacterial or viral antigens,such as bacterial cell wall [O] antigens).Bacteriophage typing,which examines the ability of bacteriophages (viruses capable of infecting and lysing bacterial cells)to attack certain strains,has been useful for typing P.aeruginosa and S.aureus,respectively.These techniques,however,are not widely available.

Question 7

A phenotypic technique that examines the ability of bacteriophages,which are viruses capable of infecting and lysing bacterial cells,to attack certain strains is:

Accepted Answer

Classic phenotypic techniques include biotyping (analyzing unique biologic or biochemical characteristics),antibiograms (analyzing antimicrobial susceptibility patterns),and serotyping (serologic typing of bacterial or viral antigens,such as bacterial cell wall [O] antigens).Bacteriophage typing,which examines the ability of bacteriophages (viruses capable of infecting and lysing bacterial cells),and bacteriocin typing,which examines an organism's susceptibility to bacterial peptides (proteins)to attack certain strains,have been useful for typing P.aeruginosa and S.aureus,respectively.These techniques,however,are not widely available.

Question 8

A phenotypic technique of typing microbial strains that consists of analyzing unique biologic or biochemical characteristics of the organism of interest is:

Accepted Answer

Classic phenotypic techniques include biotyping (analyzing unique biologic or biochemical characteristics),antibiograms (analyzing antimicrobial susceptibility patterns),and serotyping (serologic typing of bacterial or viral antigens,such as bacterial cell wall [O] antigens).Bacteriophage typing,which examines the ability of bacteriophages (viruses capable of infecting and lysing bacterial cells)to attack certain strains,have been useful for typing Pseudomonas aeruginosa and Staphylococcus aureus,respectively.These techniques,however,are not widely available.

Question 9

A 76-year-old man attends a meeting at his condominium association where many of his neighbors are sick with respiratory symptoms.He later develops a Haemophilus influenzae infection,which is classified as a _________ infection.

Accepted Answer

A community-acquired infection is an infection contracted outside of a health care setting or an infection present on admission.Community-acquired respiratory infections commonly involve strains of H.influenzae or Streptococcus pneumoniae and are usually more sensitive to antibiotics.

Question 10

A phenotypic technique of typing microbial strains that consists of serologic typing of bacterial or viral antigens,such as bacterial cell wall antigens of the organism of interest,is:

Accepted Answer

Classic phenotypic techniques include serotyping (serologic typing of bacterial or viral antigens,such as bacterial cell wall [O] antigens),biotyping (analyzing unique biologic or biochemical characteristics),and antibiograms (analyzing antimicrobial susceptibility patterns).Bacteriophage typing,which examines the ability of bacteriophages (viruses capable of infecting and lysing bacterial cells)to attack certain strains,has been useful for typing P.aeruginosa and S.aureus,respectively.These techniques,however,are not widely available.

Quiz 77: Infection Control

A phenotypic technique that examines an organism's susceptibility to bacterial peptides (proteins) is:

An infection acquired by a hospitalized patient that was not present when he or she entered the hospital is referred to as a(n) _____ infection.