Yellow fever is a potentially fatal, mosquito-borne, viral disease that occurs in many countries in Africa, the Caribbean, and Central and South America - VCE - SSCE Biology - Question 5 - 2016 - Paper 1
Question 5
Yellow fever is a potentially fatal, mosquito-borne, viral disease that occurs in many countries in Africa, the Caribbean, and Central and South America. An effectiv... show full transcript
Worked Solution & Example Answer:Yellow fever is a potentially fatal, mosquito-borne, viral disease that occurs in many countries in Africa, the Caribbean, and Central and South America - VCE - SSCE Biology - Question 5 - 2016 - Paper 1
Step 1
What is a vaccine?
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A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. Vaccines typically contain an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins.
Step 2
Why is this time frame recommended?
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This time frame is recommended to allow sufficient time for the immune system to mount a response to the vaccine. Specifically, it takes time for B memory cells to develop, which are crucial for establishing long-term immunity and ensuring adequate antibody production when exposed to the actual pathogen.
Step 3
Name of cell type 1
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T memory cells
Step 4
Role
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T memory cells survive for many years and proliferate rapidly into T-helper (Th) and T-cytotoxic (Tc) cells when the body is exposed to a pathogen for the second time, mounting a quicker and stronger response.
Step 5
Name of cell type 2
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B memory cells
Step 6
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B memory cells will rapidly divide and form new antibody-producing plasma cells when re-exposed to the same pathogen, providing a timely and effective immune response.
