A-LevelBiologyImmunity9700/12 · Feb/Mar 2024 · Q401 Mark
Measles is an infectious disease caused by a virus. The graph shows the number of cases of measles each year in a country before and after a vaccine was introduced. [Figure 40.1] What could have caused the decrease in the number of cases of measles after vaccination was introduced?
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Avaccines provided artificial active immunity in people: ✓, vaccines provided artificial passive immunity in people: X, fewer people are able to act as hosts for the virus: ✓
Bvaccines provided artificial active immunity in people: X, vaccines provided artificial passive immunity in people: ✓, fewer people are able to act as hosts for the virus: ✓
Cvaccines provided artificial active immunity in people: ✓, vaccines provided artificial passive immunity in people: X, fewer people are able to act as hosts for the virus: X
Dvaccines provided artificial active immunity in people: ✓, vaccines provided artificial passive immunity in people: ✓, fewer people are able to act as hosts for the virus: X
✓ Correct answer
A: vaccines provided artificial active immunity in people: ✓, vaccines provided artificial passive immunity in people: X, fewer people are able to act as hosts for the virus: ✓
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