Resistance to infection (immunity) may be acquired following a disease, by asymptomatic carriage of the pathogen, by harboring an organism with a similar structure (crossreacting), or by vaccination. Knowledge of the protective antigens and specific acquired host immune factors is more complete for primary pathogens than for opportunistic pathogens. There is also the phenomenon of herd immunity which offers a measure of protection to those otherwise vulnerable people when a large enough proportion of the population has acquired immunity from certain infections. COUNT 5
QSN1 What is resistance to infection known technically as? ANS1 immunity QSN2 When may immunity be acquired? ANS2 following a disease QSN3 What is knowledge of protective antigens more complete for? ANS3 primary pathogens QSN4 What does herd immunity offer to vulnerable people when a large enough proportion of the population has acquired immunity? ANS4 a measure of protection QSN5 Vaccination is a way in which what may be acquired? ANS5 immunity