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Technical Methods J Clin Pathol 1987;40:581-588 J Clin Pathol: first published as 10.1136/jcp.40.5.581 on 1 May 1987. Downloaded from 56°C for 30 minutes. Technical methods Complement fixation tests were performed accord- ing to established methods,10 1 except that microtitre plates were used instead of World Health Organisation trays. For maximum sensitivity an ini- Cytomegalovirus (CMV) tial serum dilution of 1/4 was used. The antigen prep- antibody screening in blood aration used was a CMV complement fixation test antigen supplied by either Flow Laboratories Ltd, donors: modification of new latex Irvine, Scotland, or the Central Public Health Labo- ratory, Colindale, England. Guinea pig complements agglutination test compared with were supplied by Wellcome Diagnostics, Dartford, two standard methods England, or Don Whitly Scientific Ltd, Shipley, England. Complement fixation tests were performed A PUCKETT J E DAVIS From the Regional Blood using the following CMV antigen and complement Transfusion Centre, John Radeliffe Hospital, combinations: (1) PHLS CMV antigen + Wellcome Headington, Oxford, England Diagnostics complement, (2) PHLS CMV antigen + Don Whitly complement, and (3) Flow Laboratories CMV antigen + Wellcome Diagnostics complement. Infection with cytomegalovirus (CMV) is common, Immunofluorescence tests were performed and between 50 and 100% of adults may show evi- according to a standard method12 13 using substrate dence of infection.1 The transmission of the virus by slides of CMV infected (Westwood strain) fibroblasts blood transfusion2 and, therefore, the need to screen the Oxford Public Health Laboratory. donations intended for at risk groups such as provided by immunocompromised patients34 and neonates5 -7 iS CMV Scan passive latex agglutination kits were now well established. supplied by Hynson, Westcott and Dunning, Mary- The techniques used for routine screening of blood land, USA (UK agents, Becton Dickinson, Oxford). donations have traditionally been complement fixa- A 500 test kit comprised five bottles of CMV antigen tion tests, immunofluorescence, and enzyme linked coated latex particles, five bottles of card dilution copyright. immunosorbent assays (ELISA). A commercial buffer, and negative, low reactive, and high reactive indirect haemagglutination assay (IHA) was recently controls, cards, and stirrers. introduced and was the subject of a comparative Latex particles that have been sensitised with CMV study by Hunt et al.8 We chose the IHA for routine viral antigens will agglutinate in the presence of CMV antibody screening because of cost, convenience, and antibody. This is visible to the naked eye against the its good correlation with the traditional methods of dark background of the card. Tests were rotated on a http://jcp.bmj.com/ complement fixation tests and immunofluorescence. Macro-Vue card test rotator Model 54 supplied by The quality of the reagents for the IHA was not main- the company. tained, however, and thus immunofluorescence has The recommended test procedure is as follows: remained the routine screening method at this centre. 25pl test serum is placed in a well of the test card Recently, a commercial latex agglutination test using a pipette and spread over the entire circle. 15 pl (LAT) kit was introduced and a local modification of latex antigen is then dropped on to each well and the based on the miniaturisation this kit was devised, card is rotated for eight minutes at 100 rpm. The on September 27, 2021 by guest. Protected described by Barbara et al.9 results are read macroscopically under a high The purpose of this study was to compare the latex intensity incandescent lamp. Barbara et al9 minia- agglutination test (LAT) with two standard methods turised this technique (a) to use 15 p1 serum and 5 p1 of CMV antibody detection, immunofluorescence, latex antigen, and (b) dilute the latex antigen 2:1 in and complement fixation tests. the card dilution buffer. In our study the LAT was modified to use 10 p1 Materials and methods serum and 5p1 latex antigen, which is closer to the serum:latex antigen ratio in the recommended test All specimens were obtained from a random sample procedure. When using such small volumes of of healthy blood donors. The blood was allowed to reagents, it is particularly important to use the clot overnight at 4°C. Serum samples were separated humidifier lid supplied with the rotator. Extra cards on the next working day and either tested the same and stirrers are required for this modification, and are day or frozen at - 30°C for later assay. Sera for com- obtainable from the company. Tests were performed plement fixation tests were inactivated by heating at using CMV latex antigen both undiluted and Accepted for publication 13 November 1986 diluted 2:1. 581 582 Technical methods J Clin Pathol: first published as 10.1136/jcp.40.5.581 on 1 May 1987. Downloaded from Table I Discrepant results among LA T, complementfixation tests, and immunofluorescence in 514 tests Result Percentage Combined No of oftotal No discrepancy LA T IF CFT discrepancies ofsera tested rate Discrepant + 6 12 2-4 LAT results + + 6 1 2 Discrepant + 8 1 6 2.2 IF results + + 3 0 6 Discrepant + 8 1 6 1.8 CFT results + + I 0-2 Totals 32 6 4 CFT, complement fixation tests; IF, immunofluorescence. Results There were discrepancies in 32 (6-4%), and an anal- ysis of these is shown in table 1. COMPARISON OF IMMUNOFLUORESCENCE, COMPLEMENT FIXATION TESTS, AND LAT DILUTION OF CMV LATEX ANTIGEN (UNDILUTED ANTIGEN) Neat latex antigen was compared with antigen diluted Five hundred and fourteen sera were tested by the 2:1 in card dilution buffer. Of 359 sera tested, 328 three methods. Initially, the complement fixation test (91 4%) gave similar results, while 31 (8 6%) were system included the PHLS CMV antigen and Well- different. Assuming that the results obtained with come complement combination, but the results undiluted antigen are correct (as they agree with com- showed an unexpectedly poor correlation by com- plement fixation tests and immunofluorescence plement fixation test and immunofluorescence (9-4% results), there were 7 2% false negative and 1 4% discrepancies) in contrast to the good correlation false positive results using diluted antigen. Most of (0-8% discrepancies) found by Hunt et al.8 If the differing results were obtained with antigen thatcopyright. immunofluorescence is taken as the definitive test had been diluted for more than two days so the dis- then 68% of these discrepancies are falsely negative crepancies were analysed daily (table 2). With and 32% falsely positive by complement fixation increasing dilution time the false negative results (as a tests. To resolve this difference the complement percentage of total discrepancies) rose from 0% on fixation tests were repeated twice, once with a day I to 32-5% on day 5, while the percentage of false different complement (PHLS antigen and Don Whit- positive results fell from 3 8% toO%. ley complement combination) which yielded 18% dis- http://jcp.bmj.com/ crepancies, and once with a different antigen (Flow Discussion antigen and Wellcome complement combination) which yielded 3 9% discrepancies. This accords with Provision of blood free of CMV for neonates and the findings of Hunt et al.8 immunocompromised patients is a continuing Of 514 sera tested by LAT, immunofluorescence, problem for the Blood Transfusion Service. The and complement fixation tests (using the Flow CMV development of techniques for population screening antigen and Wellcome complement combination), has been hampered by long operator time, technical on September 27, 2021 by guest. Protected 482 (93 6%) gave similar. results in all three tests. complexity, lack of sensitivity and specificity, and Table 2 Effect oftime on latex antigen dilution Total No of Latex antigen Latex antigen No of Percentage Day samples tested (undiluted) (diluted 2:1) discrepancies oftotal 1 79 + 0 0 + 3 3-8 2 120 + 2 1 7 + 2 1.7 3 80 + 4 50 + 0 0 4 40 + 7 175 + 0 0 5 40 + 13 325 + 0 0 J Clin Pathol: first published as 10.1136/jcp.40.5.581 on 1 May 1987. Downloaded from Technical methods 583 cost. In this studv a new latex agglutination test was References compared with immunofluorescence and complement 1 Sissons JGP, Borysiewicz LK, Rodgers B, Scott D. fixation using these criteria. Cytomegalovirus-its cellular immunology and biology. LAT is a simple technique requiring little special- Immunology Today 1986;1:57-61. ised equipment, and it is rapid; 50 CMV antibody 2 Prince AM, Szmuness W, Millian SJ, David DS. A serological tests can easily be performed in 20 minutes. In con- study of cytomegalovirus infections associated with blood transfusions. New Engl J Med 1971;284: 1125-31. trast, both complement fixation tests and immuno- 3 Lang DJ, Ebert PA, Rodgers BM, Boggess HP, Rixse RS. Reduc- fluorescence require a good deal of time and technical tion of postperfusion cytomegalovirus infections following the expertise. Immunofluorescence takes about three use of leukocyte depleted blood. Transfusion 1977;17:391-95. hours and need a fluorescence microscope. Com- 4 Ho M. Cytomegalovirus-biology anid infection. New York: Ple- specialised equip- num Medical Books, 1982. plement fixation tests need little 5 Benson JWT, Bodden SJ, Tobin JO'H. Cytomegalovirus and ment, but are time consuming and require overnight blood transfusion in neonates. Arch Dis Child 1979;54:538-41. incubation. Shorter incubation times have been used, 6 Yeager AS, Grumet FC, Hafleigh MT, Arvin AM, Bradley JS, but with noticeably inferior sensitivity.8 The. quality Prober CG. Prevention of transfusion acquired cyto- to megalovirus infections in newborn infants. J Pediatr of complement fixation test results also seem 1981;98:281-87. depend on the source of reagents. 7 Adler SP, Chandrika T, Lawrence L, Baggett J. Cytomegalovirus The combined discrepancy rates for the three tests infections in neonates acquired by blood transfusions.
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