Abstract
During a 4-month period, two methods for rapid detection of herpes simplex virus (HSV) were examined: (i) pretreatment of A549 cells with dexamethasone for conventional tissue culture (277 specimens) and (ii) 24-well plate centrifugation using A549 cells with and without dexamethasone pretreatment and staining with serotype-specific monoclonal antibodies (Syva Co., Palo Alto, Calif.) after incubation for 16 to 18 h (153 specimens). By conventional tube cell culture, both with and without dexamethasone, HSV was identified in 88 of 277 (32%) specimens. Significantly more specimens were positive for HSV at 24 h (46 versus 27 specimens) and at 48 h (a total of 72 versus 59 specimens) (P less than 0.0001) in dexamethasone-treated A549 cells. Of the 153 specimens tested by conventional culture and 24-well plate centrifugation, HSV was detected in 44 (29%) by conventional culture, and by 24-well plate centrifugation with and without dexamethasone, HSV was detected in 32 (21%) and 30 (20%) specimens, respectively. The sensitivity, specificity, and positive and negative predictive values of 24-well plate centrifugation with A549 cells for detection of HSV were 73 (71% without dexamethasone), 100, 100, and 90%, respectively. In conventional tube cell culture, pretreatment of A549 cells with dexamethasone results in more rapid detection of HSV. Centrifugal inoculation of dexamethasone-treated and untreated A549 cells in 24-well plates and staining with monoclonal antibodies after incubation for 16 to 18 h is an insensitive means to detect HSV in clinical specimens and should not replace conventional tube cell culture.
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