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7 Cards in this Set

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A 14 month old presented to his family physician with fever, vomiting, and lethargy of 24 hours duration. There was no neck stiffness or photophobia, but a non blanching rash was found on the boys chest. His tonsils were inflamed. The child was diagnosed with upper respiratory viral infection and transported to the hospital. That evening, the child became irritable and drowsy. He was started on parenteral fluids and ceftriaxone. Several hours later, the patient developed seizures. the boy was transferred to the pediatric intensive care unit, where he developed unreactive pupils and central non-responsive hypothermia. The next day, he showed no recordable brainstem activity. The child died two days after admission. Group B meningococcal infection was diagnosed by rapid antigen screen and confirmed on blood culture. The most likely source of the meningococcal infection was....
close contact with a carrier.
A G- diplococcus was isolated from a chocolate agar culture of a CSF sample. Which test or observation would be most informative in identifying the organism as N. meningitiditis?
Positive oxidase test and ability of culture isolate to ferment glucose and maltose.
List a factor characteristic of N. meningitiditis, but not N. gonorrhoeae?
Contains a polysaccharide capsule. N. gonorrhhoeae possesses no capsule, and metabolizes only glucose. Some vaccines exist for N. meningitiditis(A, C, 135 and Y). Not for N. gonorhhoeae.
A Lac+ glucose fermenting, G- rod isolated from a previously healthy child with bloody diarrhea is most likely to be...
E. coli. Shigella may cause a bloody dysentery, but is Lac neg. Salmonella is Lac neg.
An elderly man, hospitalized and recovering from cardiac bypass surgery, develops pneumonia. Sputum culture reveals a G- rod that produces a green pigment but does not ferment carbohydrates. The most likely organism is....
Pseudomonas aeruginosa. Five organisms that are opportunists and capable of causing pneumonia in compromised patients. With P. aeruginosa produces green pyocyanin pigment regularly occurs.
An elderly, alcoholic male develops severe, necrotizing lobar pneumonia. The organism is Lac+ and produces a substantial capsule. The most likely agent is...
Klebsiella pneumoniae. Serratia can cause pneumonia in compromised patients, yet necrosis is not a feature, and does not possess a luxuriant capsule.
List 5 organisms that are opportunists and capable of causing pneumonia in compromised patients.
1. Klebsiella pneumoniae
2. Serratia species
3. Proteus species
4. Enterobacter species
5. Pseudomonas aeruginosa