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1 :: All Enterobacteriaceae share all of the following characteristics EXCEPT?
* A. Ferment glucose* B. Reduce nitrates to nitrites
* C. Oxidase positive
* D. Gram negative
* E. Rod-shaped (bacilli)
Correct Answer: C
2 :: What is the O antigen of Enterobacteriaceae?
* A. Cell surface polysaccharide* B. A channel controlling substance taken into the organism.
* C. A flagellar protein
* D. A peptidoglycan matrix important for cellular rigidity
* E. Cell wall lipopolysaccharide
Correct Answer: E
3 :: Which of the following statements about the 23-valent pneumococcal vaccine is not correct?
* A. It is a protein-conjugated, polysaccharide vaccine.* B. It is poorly immunogenic in young children and immuno compromised hosts.
* C. It is routinely recommended for immune competent adults and children >2 yrs. of age at risk for serious pneumococcal disease.
* D. It protects against the major serotypes of pneumococci causing infection.
* E. An adult with asplenia would be a candidate for this vaccine.
Correct Answer: A
4 :: Which of the following statements about Group B a streptococcus (Streptococcus agalactiae) is not correct?
* A. They are important causes of toxic strep syndrome.* B. They are frequent colonizers of the female genital tract.
* C. Screening for this pathogen during pregnancy has reduced the incidence of neonatal sepsis.
* D. These organisms are b-hemolytic.
* E. They are important causes of urinary tract infections and bacteremia in elderly and diabetic adults.
Correct Answer: A
5 :: A 12 year old boy presents with acute onset of sore throat, fever to 38.9 degrees C and painful anterior cervical lymphadenopathy. On exam the pharynx is red and swollen and the tonsils are covered with yellow-white exudates. The child also has halitosis. Which of the following non-suppurative complications are of concern?
* A. Sinusitis* B. Acute rheumatic fever alone
* C. Acute glomerulonephritis alone
* D. Acute rheumatic fever and acute glomerulonephritis
* E. Scarlet fever alone
Correct Answer: D
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