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J Clin Microbiol. 1988 December; 26(12): 2531-2535

Comparison between viremia and antigenemia for detection of cytomegalovirus in blood.

W van der Bij, J Schirm, R Torensma, W J van Son, A M Tegzess and T H The

Department of Clinical Immunology, University Hospital Groningen, The Netherlands.

ABSTRACT

In a prospective study, 139 serial blood samples from 15 transplant recipients were assessed for the presence of cytomegalovirus (CMV) by virus isolation (CMV viremia) and by direct staining of CMV antigens (CMV Ag) in blood leukocytes (CMV antigenemia). CMV was isolated from 23 samples, whereas CMV Ag was detected in 44 specimens. All positive samples were from a total of nine patients who were diagnosed as having active CMV infections. In seven patients, active CMV infections were diagnosed by virus isolation from blood and urine and by a significant rise of CMV-specific antibodies. In these patients, 21 of the 23 blood samples which were positive for CMV by cell culture were also positive by direct CMV Ag detection. Moreover, CMV Ag were detected in 23 of the 116 culture-negative samples. Twenty of these samples were from the acute phase of infection in the same seven patients. The remaining three CMV Ag-positive specimens were from the other two patients, from whom CMV was not isolated but who had serological evidence of concomitant active CMV infections. These results suggest that direct detection of CMV Ag in peripheral blood leukocytes is as specific as and more sensitive than current isolation techniques. Furthermore, by its sensitivity and inherent rapidity the antigen detection test proved to be the earliest diagnostic marker of active CMV infection in eight of the nine patients. Finally, it was shown that monoclonal antibodies to CMV immediate early antigens are a prerequisite for demonstration of CMV antigenemia.

J Clin Microbiol. 1988 December; 26(12): 2531-2535




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