Q. Study the table below and then answer the questions that follow.

Name of disease	Causative agent	Age when the vaccine is administered	Method of vaccination
Tuberculosis	Bacterium	At birth	Injection
Poliomyelitis	Virus	At birth, after 6 weeks, after 10 weeks, after 14 weeks	Oral inoculation
Whooping cough	Bacterium	6th and 14th week	Injection
measles	Virus	9th month	Injection

(a)What part of the human body is affected by the virus that causes poliomyelitis? 1mk

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(b)Give a reason why some doses of vaccine are given more than once. 1mk

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(c) Suggest a reason for the delay in vaccinating against measles until the 9^th month(1 mark)

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(d) Describe the immune response. (2 marks)

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(e) What is a vaccine? (1 mark)

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(f) What is the role of vaccination in providing immunity? (1 mark)

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(g) What triggers an allergic reaction? (1 mark)

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