A patient tells the nurse that he does not get colds or illnesses that other people have. This information suggests the patient has
1. a compromised immune system.
2. strong passive immunity.
3. a strong antigen-antibody response.
4. poorly differentiated histocompatability antigens.
3
Rationale: Normally, an antibody circulates in the bloodstream until it encounters an appropriate antigen to bind. This binding results in antigen–antibody complexes, or immune complexes. The process of binding is such that the antibody binds to specifically conformed antigenic determinant sites on the antigen, which prevents the antigen from binding to receptors on host cells. The outcome is the host is protected from an infection. A patient with a compromised immune system would have an increased susceptibility to infections and illnesses. Passive immunity is a temporary immunity involving the transfer of antibodies from one individual to another or from some other source to an individual. Passive immunity can be transferred also through vaccination either of antiserum, an antitoxin, or as gamma globulin. Histocompatibility antigens are surface antigens which are genetically determined and are proteins found on the surface of a cell. These antigens would not impact the patient's inability to get colds or other illnesses.
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