SBA — Single Best Answer · Review
Question 608
Immunology → General
Classification
Question
SSBAQuestion Header
Which example represents natural passive immunity?
Question Stem
Select the single best answer.
Options
A
Immunity following clinical infection
B
Immunity following vaccination with an inactivated toxoid
C
Transfer of maternal antibody to the baby through the placenta
D
Administration of pooled human gamma globulin
E
Immunity following an inapparent infection
Explanation
Natural passive immunity results from transfer of readymade antibody from mother to baby through the placenta. Administration of pooled human gamma globulin is artificial passive immunity, while infection and vaccination produce active immunity.
Option Validity
A) Clinical infection produces natural active immunity.
B) Vaccination produces artificial active immunity.
D) Administered pooled human gamma globulin produces artificial passive immunity.
E) Inapparent infection produces natural active immunity.
Further Reading
Saxena MRCOG-1 Basic Sciences — Immunology: Innate and Acquired Immunity, printed page 209.