Viral load assessment for - CMV

Role

Quantitative CMV PCR (blood viral load) is used for surveillance and diagnosis of CMV reactivation in high-risk immunosuppressed patients, predominantly solid organ and haematopoietic stem cell transplant recipients
Routine periodic monitoring is standard practice in transplant recipients at risk of reactivation, particularly donor-positive/recipient-negative serostatus mismatches carrying the highest risk

Rising viral load reflects active viral replication as immunosuppression permits escape from latency - the rate of rise and absolute level both inform the urgency of intervention, with a rapidly rising load prompting earlier pre-emptive treatment than a slowly rising one

Pre-emptive monitoring strategy: regular viral load checks in high-risk recipients, with pre-emptive antiviral treatment triggered by a defined viral load threshold or rate of rise, rather than waiting for clinical end-organ disease to develop
Alternative universal prophylaxis strategy (fixed-duration antiviral prophylaxis in all high-risk recipients regardless of viral load) is used in some transplant programmes/protocols instead of pre-emptive monitoring
The choice between pre-emptive monitoring (treat based on rising viral load) and universal prophylaxis (treat everyone at risk regardless of viral load) is a genuine, protocol-dependent choice across transplant programmes - both are legitimate strategies with different trade-offs (drug toxicity/cost vs monitoring burden), not a single universally "correct" approach

Rising viral load above the pre-emptive treatment threshold -> valganciclovir/ganciclovir treatment to prevent progression to end-organ disease
Viral load trend also monitors treatment response once therapy for confirmed reactivation/disease has started

Transplant recipient surveillance protocols, pre-emptive vs universal prophylaxis strategy choice, donor/recipient serostatus mismatch risk stratification, ganciclovir resistance (a concern with prolonged/repeated treatment courses)

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