A Researcher Is Analyzing the Immune Response of a Patient

question 21

Multiple Choice

A researcher is analyzing the immune response of a patient following the patient's exposure to an unknown agent while out of the country. The patient's blood is found to have a high proportion of lymphocytes with CD8 surface proteins. What is the likely cause?

• A)The patient encountered a bacterial infection which elicited CD8 marked T cells.
• B)The disease must have been caused by a multicellular parasite, such as can be encountered in polluted water sources.
• C)The CD8 proteins would be discharged from these lymphocytes to lyse the infected cells.
• D)The CD8 proteins marked the surfaces of cytotoxic T cells to attack virus-infected host cells.
• E)CD8 marks the surface of cells that accumulate after the infection is over and signal patient recovery.

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