A) formaldehyde
B) alcohol
C) synthetic detergents
D) fluorescent dyes
E) alum

A) It can be produced with deactivated whole microorganisms.
B) It can be produced from antigenic fragments of a pathogen.
C) It is safer than an attenuated vaccine.
D) It is made from mutated forms of the pathogen.
E) It is made from pathogens that cannot replicate.

A) They are produced against the toxin of the microorganism rather than the microorganism itself.
B) They provide lifelong immunity.
C) They stimulate antibody immune responses.
D) They have few antigenic determinants.
E) They are chemically or thermally modified.