Which of the following describes an antigen-antibody reaction?

What is a pre-release version of a program given to some users and developers to preview and test the program before its final version is released?

Which of the following is most likely to activate the alternative pathway of complement activation?

Hereditary deficiency of late complement components (C5, C6, C7 or C8) can be associated with which of the following conditions?

Which of the following are true statements about selective IgA deficiency?

Blood is drawn from a patient for serological tests for a viral disease at the time of onset and again 4 weeks later. The results of the tests are considered diagnostic if the: 

Bence Jones proteins are:

The C3b component of complement:

A peripheral blood total leukocyte count is 10.0 × 103/µL. The differential reveals 55% neutrophils, 2% eosinophils, 40% lymphocytes and 3% monocytes. Assuming a lymphocyte recovery of 85%-95%, what is the expected number of T cells in a normal individual? 

The best method to detect infections due to rubella, Epstein-Barr and human immunodeficiency viruses is: