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1 Division of Communicable Diseases, Royal Free Hampstead NHS Trust and School of Medicine, Rowland Hill Street, Hampstead, London NW3 2PF, UK
and2 Renal Transplant Unit, Royal Free Hampstead NHS Trust and School of Medicine, Rowland Hill Street, Hampstead, London NW3 2PF, UK
Serial surveillance samples of urine collected from 103 renal transplant recipients were analysed by polymerase chain reaction (PCR) for the presence of human cytomegalovirus (HCMV) DNA. The PCR results were consistently negative in 70 patients, none of whom developed HCMV disease, and PCR positive in 33 patients of whom 10 developed HCMV disease (P < 0·001). In 12 patients, PCR results were positive in three or more consecutive samples indicating extensive HCMV replication. HCMV load in 104 samples from these patients was analysed using a quantitative coamplification PCR system. The maximal viral burden in the symptomatic patients ranged from 105·9 to 107·12 genomes/ml urine (median 106·5) and in the asymptomatic patients from 104 to 105·7 genomes/ml urine (median 105·2). The 101·3 difference between these median values was significant (P < 0·01). Individual kinetic profiles of viral burden showed that high levels of HCMV correlated with clinically apparent disease. In the majority of the asymptomatic individuals HCMV load remained between 104 and 105·1 genomes/ml urine; however, in two patients fluctuations in viral load were observed involving higher viral levels (up to 105·7 genomes/ml urine) suggesting that immune responses able to modulate viral replication could be studied in individual patients. Analysis of the temporal appearance and quantity of HCMV in the urine with alterations in white cell numbers showed that leukopenia occurred following the appearance of HCMV in the urine of symptomatic patients but preceded HCMV in the urine of asymptomatic patients (P = 0·01). Overall, these results show that longitudinal analysis using fully quantitative PCR methods for HCMV can provide insight into the natural history of HCMV disease in renal transplant recipients.
* Author for correspondence. Fax +44 171 830 2854. e-mail vincent@rfhsm.ac.uk
Received 6 July 1994;
accepted 7 October 1994.
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