a. During the third trimester, passive immunity to some diseases is provided by the mother.

b. Diseases that the fetus receives temporary protection from include:

(1) Rubella.

(2) Diphtheria.

(3) Measles.

(4) Poliomyelitis.

(5) Tetanus.

(6) Mumps.

c. Passive immunity is short term and infants must begin immunization against the above diseases by the age of 2 months.