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A healthy patient undergoes routine pre-operative laboratory testing and is found to have a leukocyte count of 1.5 × 10(9) cells/L. When the historical records are examined, this is found to be the patients base-line level over a period of years. Which of the following statements is most likely to be true:
The patient is at a significantly higher risk of surgical infection
The patient is more likely to be of African descent than white
The patient is more likely to be of European than of Middle Eastern descent
The patient is more likely to be a non-athlete than an athlete
The patient is more likely to be female than male
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The acquired immune response mediated by the interaction between the T cell receptor and major histocompatibility complex requires which of the following first steps?
Antigen phagocytosis by T cells
Antigen processing and presentation to T cells
Antigen recognition by natural killer T cells
Antigen proliferation by polymerase chain reaction
T cell disulfide bond cleavage and enzymatic processing
A type IV (delayed-type hypersensitivity reaction) can be seen in which of the following scenarios?
Packed red blood cell transfusion
Immune inert scaffold placement
Metal plate and screw placement for fracture
Red man syndrome from vancomycin administration
What is the first class of antibody to appear in serum after exposure to a foreign antigen?