Over 300 CD cell surface identification markers have been discovered.

It is necessary to do lab tests to diagnose all diseases.

A secondary acquired immunodeficiency is ________.

All antigens are immunogens.

Each of the following is an autoimmune disease except ________.

Which lymphocytes lack specificity for antigen and are cells that attack cancer cells and virus-infected cells?

Food allergies include gastrointestinal symptoms and often hives.

A 16-year-old male with a low-grade fever, and large and painful red sores around his lips is being evaluated at a pediatric clinic. He has a PCR test pending that was swabbed from the sores, as well as a blood culture with Gram stain, and nasopharyngeal specimen for microscopic examination.   Which of the following can be determined from phenotypic assessment of the nasopharyngeal sample? 

What could result when grafted tissue such as bone marrow contains passenger lymphocytes?

Allergic reactions to penicillins are considered a(n) ________ hypersensitivity.