A-LevelBiologyImmunity9700/12 · May/June 2021 · Q361 Mark
Which statement explains why a one-dose vaccination programme for measles has not yet eliminated the disease?
AMany infants under the age of eight months have passive immunity.
BSome children need several booster doses to develop full immunity.
CThe one-dose measles vaccine has a success rate of 93%.
DThe virus does not often change its antibodies.
✓ Correct answer
B: Some children need several booster doses to develop full immunity.
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill Immunity and see which topics are most likely to come up next.
Sign up free →