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.
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.