Question

define
(a) Incubation period

(b) Contamination period

(c) Infection period​

Answer 1

1. the period over which eggs, cells, etc. are incubated.

Answer 2

incubation period : period between exposure to an antigen and the appearance of first symptoms

contamination period - i guess it's the same as incubation period (not so sure)

(or else this term doesn't exist)

infection period - the period from first evident manifestation(a sign that something has happened) of an infectious disease to the final host reaction.

hope it helps