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Quiz online 16 March 2012

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1Quiz online 16 March 2012 Empty Quiz online 16 March 2012 Tue Mar 20, 2012 7:13 pm


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1. Diphteria toxin is only produce by those strain of C.diphtheriae that are?

a) Glucose fermenters
b) Sucrose fermenters
c) Lysogenic for prophage
d) Of the mitis strain.

2. List 3 bacteria used as an indicator of faecal pollution of water.

3. Give reasons.
a) A person can catch repeated attack of common cold during the same seasons.

b) Tuberculin test may give false positive reaction

c) Hepatitis D virus is a defective virus.

2Quiz online 16 March 2012 Empty Answers: Tue Mar 20, 2012 7:14 pm


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1. C (refer pg 23 vol.2)

2. escherichia coli,enterococcus faecalis,clostridium perfringens. ( refer pg 54 vol. 2 )

a)•Multiplicity of antigenic type(over 100)
•Being a superficial infection,serum antibodies plays no significants role in immunity
•Immunity is mainly superficial by Ig A and interferon(short term immunity).
(refer pg 27 vol.3)

b)•Infection with non tuberculous mycobacteriae(NTMO) due to cross reaction with M.tuberculosis antigens.
•Vaccination with bacille Calmette-Guerin(BCG).After BCG vaccination,tuberculin skin test remain positive for up to 5 years.
(refer pg 46 vol.2)

c)HDV can only replicate in patients with HBV infection.
(refer pg 14 vol 3)

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