Chickenpox (varicella) is a highly contagious viral disease caused by the varicella-zoster virus (VZV) - VCE - SSCE Biology - Question 14 - 2015 - Paper 1
Question 14
Chickenpox (varicella) is a highly contagious viral disease caused by the varicella-zoster virus (VZV).
A technician measured the concentration of antibodies to VZV... show full transcript
Worked Solution & Example Answer:Chickenpox (varicella) is a highly contagious viral disease caused by the varicella-zoster virus (VZV) - VCE - SSCE Biology - Question 14 - 2015 - Paper 1
Step 1
a. an exposure of the person to VZV
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Answer
Exposure to VZV would typically not result in an immediate increase in antibody concentration. Instead, it would initiate an immune response that might take time to manifest in detectable levels of antibodies.
Step 2
b. a booster vaccination against VZV for the person
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Answer
A booster vaccination generally helps enhance the immune response over time. It may not cause an immediate spike in antibody levels, and therefore is less likely an event responsible for a significant concentration change on day 30.
Step 3
c. an injection of antibodies to VZV into the person
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An injection of antibodies directly into the person would result in a significant and immediate increase in the concentration of antibodies in the blood. This aligns with the observation from day 30 in the graph.
Step 4
d. an oral dose of antibodies was given to the person
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An oral dose of antibodies is less common and generally not effective in rapidly increasing antibody levels in the bloodstream due to digestive breakdown. Therefore, this is unlikely to be the event that occurred on day 30.
