1. Mark is a technician in a blood bank at a local hospital. It is required that

Question

1. Mark is a technician in a blood bank at a local hospital. It is required that everyone who works with human blood products be vaccinated against hepatitis B virus. Following his vaccination it was found that Mark was not responsive. As Mark's physician you decide to investigate into Mark’s family medical history. You find out that both of Mark parents worked for the American Red -Cross when Mark was conceived. As Red Cross workers, Mark parents had to be vaccinated against hepatitis B virus. The vaccine used was a live attenuated virus. Choose the correct answer and fully defend your answer. Mark's failure to respond to the vaccine is due to:

a. bad and ineffective vaccine

b. Mark's parents were not careful while taking the vaccine

c. Mark did not really take the vaccine

d. Mark has no B- cells to respond to the vaccine

.

Explanation / Answer

Answer option - B - Mark's parents were not careful while taking the vaccine.

The person who does not respond to the vaccine may already be infected with hepatitis B. Since, Mark parents had vaccinated against hepatitis B when he was in their womb, he is not responsive now.

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