Rickettsial Dz’s Of Humans; Typical Bacterial Pneumonias

7 Questions | By Chachelly | Last updated: Mar 20, 2022 | Total Attempts: 488

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1.

A 36-year-old man in Texas with fever, headache, myalgia, and tick exposure had a serological test that showed antibodies against Ehrlichia chafeeensis. What is a feature of Ehrlichia that differs from other Rickettsia?
- A.
  
  Invasion of mononuclear leukocytes
- B.
  
  Invasion of vascular endothelium
- C.
  
  Cell wall that contains peptidoglycan
- D.
  
  Cell wall that contains lipopolysaccharide
- E.
  
  Invasion of polymorphonuclear leukocytes
2.

An outbreak of murine (endemic) typhus occurred in the US in 2008. Affected patients experienced fever, headache, chills, vomiting, nausea, myalgia, and rash. Of the 53 cases, 62% had a four-fold rise in antibody titer to Rickettsia typhi antigens. What is the vector associated with transmission of this organism?
- A.
  
  Mosquito
- B.
  
  Body louse
- C.
  
  Tick
- D.
  
  Flea
- E.
  
  Sand fly
3.

How are the obligate intracellular pathogens of the genera Rickettsia, Ehrlichia, and Anaplasma transmitted by vectors?
- A.
  
  All are transmitted by ticks except for Rickettsia typhi, which is transmitted by lice
- B.
  
  Rocky Mountain spotted fever is transmitted mainly by Amblyoma ticks found in Texas
- C.
  
  Anaplasma is transmitted mainly by Ixodes ticks, which can be co-infected with Babesia or agent of Lyme disease
- D.
  
  Epidemic typhus is transmitted mainly by rodent fleas
4.

A 50 year old man diagnosed as having the features of a lobar Pneumonia. Which one of the following symptoms is most indicative of pneumonia?
- A.
  
  He had chest pain, cough and difficulty with lying flat in bed at nights
- B.
  
  He had fever, hoarseness, a post-nasal drip and a cough
- C.
  
  There was fever, left chest pain on breathing, cough, and yellow sputum
- D.
  
  He had cough, acute shortness of breath, hemoptysis and left calf pain
- E.
  
  On walking that morning he had a wheezy chest, cough and shortness of breath
5.

A 62-year-old male presented with the sudden onset of shaking chills, cough productive of thick yellow sputum, and dyspnea. The x-ray showed lobar consolidation of the right lower lobe. Sputum culture grew Streptococcus pneumoniae. Which clinical feature of this case of typical pneumonia best differentiates it from atypical pneumonia?
- A.
  
  Sudden onset
- B.
  
  Thick purulent sputum
- C.
  
  Shaking chills
- D.
  
  X-ray pattern
- E.
  
  Culture result
6.

An 86-year-old man was admitted to the hospital with a fever and chest x-ray evidence of consolidation and received antibiotics. Two weeks after his initial admission, he was re-admitted to the hospital with fever, a purulent cough, and dyspnea. What organism was likely to have been cultured from sputum during his second illness?
- A.
  
  Streptococcus pneumonia
- B.
  
  Haemophilus influenza
- C.
  
  Staphylococcus epidermidis
- D.
  
  Klebsiella pneumonia
- E.
  
  Moraxella catarrhalis
7.

A 23-year-old pregnant woman is admitted to hospital in severe respiratory distress following a week-long influenza-like illness for which she received symptomatic treatment only. A respiratory specimen taken in intensive care shows Gram-negative bacilli. What is the most likely causative agent?
- A.
  
  Streptococcus pneumonia
- B.
  
  Haemophilus influenzae
- C.
  
  Staphylococcus aureus
- D.
  
  Klebsiella pneumoniae
- E.
  
  Moraxella catarrhalis