Immunology 64 - 130

64 ) The enzyme control tube in an ASO hemolytic assay exhibits no cell lysis. What is the MOST likely explanation for this?

66) In a positive anti-streptolysin "O" enzyme inhibition test, the patient's :

67) 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 test are considered diagnostic if the:

68) Which of the following is most useful in establishing a diagnosis in the convalescence phase of a viral infection.

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

70) Immunoassays are based on the principle of:

71) A DPT vaccination is an example of:

72) Cells known to be actively phagocytic include:

73) The prescence of HbsAg, anti-HBc and often HbeAg is characteristic of:

77) When testing a patient for HIV antibody, which of the following is used to confirm a positive screening test?

80) What kind of antigen-antibody reaction would be expected if soluble antigen is added to homologous antibody?

81) The Rapid Plasma Reagin test:

82) Flocculation tests for syphilis detect the presence of:

83) In the cold agglutinin test, the tubes containing the serum and erythocytes are allowed to stand overnight in the refrigerator, and the results are read the next morning. If a disk of the erythrocytes floats up from the bottom of the tube with only the flick of finger, this is read as a:

84) Flocculation tests for syphilis use antigen composed of:

86) A VRDL serum sample is heat inactivated, then placed in a refrigerator for overnight storage. Before being tested, the serum must be:

87) Substances that are antigenic only when coupled to a protein carrier are:

89) A serological test for syphilis that depends upon the detection of cardiolipin-lecithin-cholesterol antigen is:

91) The serological test for syphilis recommended for detecting antibodies in cerebrospinal fluid is:

96) What assay would confirm the immune status to hepatitis B virus?

97) The following procedure has been routinely used for detection of hepatitis B surface antigen (HBsAg) because of it's high level of sensitivity:

98) In an indirect ELISA method designed to detect antibody to the rubella virus in patient serum, the conjugate used should be:

101) Which of the following is the best indicator of an acute infection with the Hepatitis A virus?

102) Biological false-positive VDRL reactions are frequently encountered in patients with:

103) Which serological marker of HBV (hepatitis B Virus) infection indicates recovery and immunity?

105) For diagnosis of late latent or tertiary syphilis, the most appropriate assay is:

A 26-year-old nurse developed fatigue, a low-grade fever, polyarthritis and urticaria. Two months earlier she had cared for a patient with hepatitis. Which of the following findings are likely to be observed in this nurse?

The classic antibody response pattern following infection with hepatitis A is:

113) The enzyme linked immunosorbent assay technique (ELISA) for the detection of HBsAg:

114) The antigen marker most associated with transmissibility of HBV infection is:

115) Chrnoic carriers of HBV:

117) The initial immune response following fetal infection with rubella is the production of which classes of antibodies?

118) A maternal serum rubella titer is equal to or greater than 1:8 indicates:

120) Which of the following is a treponemal test?

121) The air temperature throughout the serology laboratory is 20*C. How will this affect VDRL and RPR test results?

122) Which laboratory technique is MOST frequently used to diagnose and follow the course of therapy of a patient with secondary syphilis?

124) The MOST commonly used serological indicator of recent streptological infection is the antibody to:

125) Antibodies composed of IgG immunoglobulin:

126) Measurement of serum levels of which of the following immunoglobulins can serve as a screening test for multiple allergies?

127) Cells that are precursors of plasma cells and also produce immunoglobulins are:

128) IgM antibodies are frequently hemolytic because of:

129) To which of the following classes do the antibodies that cause hemolytic disease of the newborn belong?

130) It is important to note that when an infant is born, levels of specific antibody of the following class are used to indicate neonatal infection: