Your patient has been on antibiotics for 6 weeks after a case of streptococcal endocarditis, an infection of the inner heart wall.  The infection clears up.  However, the patient just visited you again. this time about a urinary tract infection, and the lab reports that the culprit this time was E. coli, a different bacterial species from the original infection. What do you hypothesize happened in this situation?  

Mycobacterium tuberculosis has chemicals in its cell wall that inhibit the fusion of phagocytic vacuoles with lysosomes.  Which statement is then most likely to be true?  

The term _________ is given to any foreign substance that stimulates a specific immune system response. 

Human red blood cell types involve all of the following EXCEPT:

Which gland shrinks in size during adulthood but has hormones that function in maturation of T lymphocytes?

Which component in the figure above is the “Antigen” in this drawing of a direct ELISA (Enzyme Linked Immunosorbent Assay) happening in the well of a plastic dish?

A patient enters your clinic with a suspected helminthic (parasitic worm) infection.  In support of this diagnosis, you suspect elevated levels (titer) of which antibody in the patient’s serum?

Which of the following is a current theory toward explaining the origin of autoimmune diseases? 

A systemic, sometimes fatal, immune reaction with airway obstruction and circulatory collapse is 

What structures are found along lymphatic vessels and are heavily clustered in the armpit, groin, and neck?