How does immunisation against diseases such as diphtheria and polio limit the spread of these infectious diseases?
(A) Immunisation kills the relevant pathogens - HSC - SSCE Biology - Question 14 - 2001 - Paper 1
Question 14
How does immunisation against diseases such as diphtheria and polio limit the spread of these infectious diseases?
(A) Immunisation kills the relevant pathogens.
(... show full transcript
Worked Solution & Example Answer:How does immunisation against diseases such as diphtheria and polio limit the spread of these infectious diseases?
(A) Immunisation kills the relevant pathogens - HSC - SSCE Biology - Question 14 - 2001 - Paper 1
Step 1
A) Immunisation kills the relevant pathogens.
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Answer
This statement is incorrect. Immunisation does not involve killing pathogens but rather helps the immune system recognize and fight them.
Step 2
B) Immunisation suppresses or reduces the immune response and associated inflammation.
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This statement is also incorrect as immunisation enhances the immune response rather than suppressing it.
Step 3
C) Immunisation strengthens first-line defence barriers and prevents the entry of the relevant pathogens into the body.
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While this may sound plausible, the primary mechanism of immunisation is not to strengthen barriers but to prepare the immune system to respond to pathogens.
Step 4
D) Immunisation reduces the multiplication of the relevant pathogens in immunised hosts and this reduces the chance of other people becoming infected.
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Answer
This statement is correct. Immunisation creates an immune response that limits the ability of pathogens to replicate within the body, thereby reducing the likelihood of transmission to others.
