Author Question: An advantage of using a broad-spectrum antibiotic is that: 1. it is effective against a large ... (Read 78 times)

drink · **on:** Jul 23, 2018

An advantage of using a broad-spectrum antibiotic is that:

1. it is effective against a large number of organisms.
2. it is effective against a small number of organisms.
3. it has a high potency.
4. it produces a large number of side effects.

Question 2

The nurse sending a wound culture to the laboratory knows that the purpose of culture and sensitivity testing is to:

1. prevent an infection, a practice called chemoprophylaxis.
2. identify bacteria that have acquired resistance.
3. promote the development of drug-resistant bacterial strains by killing the bacteria sensitive to a drug.
4. determine which antibiotic is most effective against the infecting microorganism.

T4T · **Reply #1 on:** Jul 23, 2018

Answer to Question 1

Correct Answer: 1
Rationale 1: A broad-spectrum antibiotic is effective against a large number of organisms.
Rationale 2: Narrow-spectrum antibiotics are effective against only one or a small group of organisms.
Rationale 3: Potency is the strength of an antibiotic and is not related to the concept of effectiveness.
Rationale 4: The presence of side effects is not related to the antibiotic spectrum.
Global Rationale: Broad-spectrum antibiotics are effective against a wide variety of different microbial species. These antibiotics may be started before results of culture and sensitivity are returned, especially if the infection is severe.

Answer to Question 2

Correct Answer: 4
Rationale 1: Culture and sensitivity testing does not prevent infections.
Rationale 2: Culture and sensitivity testing indicates resistance but not acquired resistance.
Rationale 3: Culture and sensitivity testing does not assist in the killing of bacteria.
Rationale 4: Culture and sensitivity testing isolates the infectious organism and determines which antibiotic would be most effective against it.
Global Rationale: Specimens such as urine, sputum, blood, or pus are examined in the laboratory for the purpose of isolating and identifying specific pathogens. After isolation, the microbe is exposed in the laboratory to different antibiotics to determine the most effective ones. This process of isolating the infectious organism and identifying the most effective antibiotic is called culture and sensitivity (C&S) testing.