A)a substance that kills bacteria but not viruses.
B)a chemical that inhibits a microorganism,but doesn't necessarily kill it.
C)any substance that inhibits or kills a microorganism.
D)a substance produced by a microorganism that kills or inhibits other microorganisms.
E)none of the above.

A)who have impaired kidney function.
B)who suffer from asthma or hay fever.
C)who are immunodeficient.
D)with high blood pressure.
E)who have pneumonia.

A)affects bacteria and viruses.
B)is active against a number of different bacteria.
C)affects all kinds of microorganisms including protozoa.
D)is bactericidal and bacteriostatic.
E)all of the above.