Nokea
Which of the following bacteria is known for producing a biofilm on medical devices?
- A. Clostridium tetani
- B. Pseudomonas aeruginosa
- C. Salmonella enterica
- D. Staphylococcus aureus
Correct Answer: B
Rationale: The correct answer is B: Pseudomonas aeruginosa. This bacterium is known for producing biofilms on medical devices due to its ability to adhere and form a slimy layer that protects it from antibiotics and the host immune system. Pseudomonas aeruginosa is commonly associated with healthcare-associated infections.
Clostridium tetani (A) causes tetanus, not known for biofilm production on medical devices. Salmonella enterica (C) causes foodborne illnesses, not typically associated with medical device biofilms. Staphylococcus aureus (D) is a common pathogen in healthcare settings but is not specifically known for biofilm production on medical devices.
You may also like to solve these questions
Which bacteria are commonly associated with food poisoning?
- A. Clostridium botulinum and Staphylococcus aureus
- B. Bacillus anthracis and Mycobacterium tuberculosis
- C. Treponema pallidum and Neisseria gonorrhoeae
- D. Escherichia coli and Klebsiella pneumoniae
Correct Answer: A
Rationale: The correct answer is A: Clostridium botulinum and Staphylococcus aureus. Clostridium botulinum produces a potent neurotoxin causing botulism, commonly associated with improperly canned foods. Staphylococcus aureus produces toxins causing symptoms of food poisoning. Bacillus anthracis and Mycobacterium tuberculosis are not typically associated with food poisoning. Treponema pallidum and Neisseria gonorrhoeae are bacteria causing sexually transmitted infections. Escherichia coli and Klebsiella pneumoniae are not directly linked to food poisoning.
Bacteriology testing is one of the methods for laboratory diagnostics of diphtheria. To grow the
- A. diphtheriae, it is necessary to know the proper conditions for causative agent cultivation. What nutrient media are optimal for Corynebacterium diphtheriae cultivation?
- B. Sugar meat pepton broth, sugar meat pepton agar
- C. Salt egg yolk agar
- D. Endomedium, Ploskirev medium
Correct Answer: B
Rationale: The correct answer is B: Sugar meat pepton broth, sugar meat pepton agar. These nutrient media are optimal for Corynebacterium diphtheriae cultivation due to their ability to support the growth of this bacterium. Sugar meat pepton broth provides a liquid medium with essential nutrients, while sugar meat pepton agar provides a solid surface for bacterial growth and isolation.
Incorrect choices:
A: Diphtheriae does not require specific conditions for cultivation.
C: Salt egg yolk agar is not commonly used for Corynebacterium diphtheriae.
D: Endomedium and Ploskirev medium are not standard media for diphtheria testing.
How would you interpret the study results?
- A. Water is safe to be consumed
- B. Water is of doubtful quality
- C. Water is of highly doubtful quality
- D. Water is contaminated
Correct Answer: D
Rationale: Step-by-step rationale:
1. The study results indicate water contamination.
2. Contaminated water poses health risks.
3. Therefore, the correct interpretation is that water is contaminated.
Summary:
- Choice A is incorrect as safety is not confirmed.
- Choice B is too mild given the severity of contamination.
- Choice C is also incorrect, as it does not accurately reflect the study findings.
Family Parvoviridae can cause all of these, except:
- A. Aplastic crisis in patients with chronic anemia
- B. Herpangina
- C. Fetal infections
- D. Fifth disease
Correct Answer: B
Rationale: The correct answer is B: Herpangina. Family Parvoviridae includes Parvovirus B19, which causes Fifth disease, aplastic crisis in chronic anemia, and fetal infections. Herpangina is caused by Enteroviruses, not Parvoviridae. Parvovirus B19 specifically targets erythroid progenitor cells, leading to anemia in susceptible individuals. Fetal infections can result in hydrops fetalis. Aplastic crisis occurs in patients with chronic anemia due to suppression of erythropoiesis by the virus.
A child with diarrhea had stool microscopy revealing cysts with four nuclei. What is the most likely causative agent?
- A. Entamoeba histolytica
- B. Giardia lamblia
- C. Balantidium coli
- D. Trichomonas hominis
Correct Answer: A
Rationale: The correct answer is A: Entamoeba histolytica. This pathogen is known to cause amoebic dysentery, characterized by diarrhea with bloody or mucoid stools. The presence of cysts with four nuclei in the stool microscopy is a characteristic feature of Entamoeba histolytica. Other choices are incorrect because Giardia lamblia typically presents with binucleate cysts, Balantidium coli is a ciliated protozoan, and Trichomonas hominis is a non-pathogenic parasite found in the human intestine.