A Child Who Suffers from a Persistent Viral Infection Is

question 9

Multiple Choice

A child who suffers from a persistent viral infection is found to have a deficiency in lymphocyte production and very few T and B cells.Other bone marrow-derived cells are produced in normal numbers,and MHC molecule expression on cells appears normal.Transfusion of mature T cells from an unrelated donor who had recovered from a previous infection by the same virus would not be expected to help the child clear his infection.Which one of the following is a reasonable explanation for why this therapeutic approach would fail?

• A)Viral infections are cleared by antibodies,not T cells.
• B)The patient's own immune system would destroy the transfused T cells before they could respond to the viral infection.
• C)T cells recognize peptides,not viral particles.
• D)Donor T cell viral antigen recognition is restricted by MHC molecules not expressed in the patient.
• E)In responding to the previous infection,the donor would have used up all his T cells specific for that virus.

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Definitions:

Health Care Coverage

Insurance that typically pays for medical, surgical, prescription drug, and sometimes dental expenses incurred by the insured, either by reimbursing the patient or paying care providers directly.

Dependent Care Expenses

Costs incurred for the care of qualifying dependents (such as children or disabled family members), which may be eligible for tax credits.

Qualifying Individual

An individual who meets specific criteria under a particular program, policy, or regulation for eligibility purposes.

American Opportunity Tax Credit

A credit for qualified education expenses paid for an eligible student for the first four years of higher education.