niti
Forum Guru
Topics: 36
Posts: 499
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Q.21) Which of the following extracellular enzymes produced by Group A streptococci is called "spreading factor," an enzyme important in skin and soft tissue infection?
A. Streptokinase
B. Hyaluronidase
C. M Protein
D. Deoxyribonuclease C
E. None of the above
Q.22 ) All of the following statements about the M-protein of Group A Streptococci are correct EXCEPT:
A. The amino terminal portion (distal portion) is variable, accounting for over 80 distinct serotypes.
B. M proteins allow streptococci to resist phagocytosis.
C. Antibodies to M protein confer type-specific immunity.
D. M protein is the major virulence factor of Group A streptococci.
E. M protein is the major constituent of the capsule of Group A streptococci
Q.23 ) Which of the following statements about Group B streptococci (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.
Q. 24 ) 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 immunocompromised 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.
Q. 25 ) Which of the following statements regarding Enterotoxigenic E. coli are CORRECT?
A. They are important causes of traveler's diarrhea.
B. Transmission occurs from ingestion of contaminated food and water.
C. Disease is caused by production of one or both of two types of enterotoxins.
D. None of the above are correct.
E. All of the above are correct.
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| Dr. Hussam
Forum Junior
Topics: 5
Posts: 56
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21-B
22-E
23-A
24-A
25-D
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