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CAIE A-Level Biology AS 10.1.4 Prevention and Control Questions

Explain immune-system defence against infectious disease using evidence from each question and mark scheme.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • Explain the role of the immune system in defence against infectious disease.

CAIE A-Level Biology AS 10.1.4 Prevention and Control Questions question 1

[Maximum number: 1]

Which feature of the disease cholera decreases the spread of the pathogen Vibrio cholerae?

A

Immunity to cholera after vaccination is short lived, lasting less than two years after vaccination in 50\% of people.

B

Up to 98 % of people infected with Vibrio cholerae are symptomless carriers.

C

Cholera rapidly kills up to 50 % of people with symptoms if they are not treated.

D

Simple rehydration therapy successfully treats about 99 % of people with symptoms of cholera.

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