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Published on: September 26, 2011
Viral load as a predictor of outcome in Crimean-Congo hemorrhagic fever
Mustafa Aydin Cevik1, Ayşe Erbay, Hürrem Bodur
1Infectious Diseases and Clinical Microbiology Department, Ankara Numune Education and Research Hospital, Ankara, Turkey.
Insights
High viral loads in Crimean-Congo hemorrhagic fever (CCHF) predict fatal outcomes. This study measured CCHF virus RNA in patients, finding viral load is a key indicator of disease severity.
Area of Science:
- Virology
- Infectious Diseases
- Public Health
Background:
- Crimean-Congo hemorrhagic fever (CCHF) is a severe, potentially fatal tick-borne viral illness.
- CCHF affects multiple organ systems, posing significant clinical challenges.
Purpose of the Study:
- To investigate the correlation between CCHF viral load and disease severity.
- To establish viral load as a predictive marker for CCHF patient outcomes.
Main Methods:
- Quantitative measurement of CCHF virus RNA using 1-step reverse-transcriptase polymerase chain reaction.
- Analysis of viral loads in 36 CCHF-infected patients, correlating with clinical outcomes (fatal vs. nonfatal).
Main Results:
- Viral loads ranged significantly, from 1.1x10^3 to over 9.9x10^9 copies/mL.
- A viral load threshold of >= 1x10^9 RNA copies/mL was strongly associated with fatal outcomes (8/9 deaths).
- This threshold demonstrated high predictive value (80%), sensitivity (88.9%), and specificity (92.6%) for mortality.
Conclusions:
- Viral load is a significant and measurable indicator of CCHF disease severity.
- Quantifying CCHF viral RNA can aid in predicting patient prognosis and guiding clinical management.
- Further research into CCHF pathogenesis and therapeutic targets is warranted.
Abstract:
Crimean-Congo hemorrhagic fever (CCHF) is a potentially fatal disease affecting multiple organ systems. To determine the association between viral load and severity of CCHF infection, quantitative measurement of CCHF virus was performed using 1-step reverse-transcriptase polymerase chain reaction for 36 patients with CCHF infection. Viral loads ranged from 1.1x10(3) copies/mL to > or = 9.9x10(9) copies/mL. Nine (25%) of 36 patients died. In 8 of the 9 patients with fatal outcomes, viral loads were detected that were > or = 1x10(9) copies/mL, whereas in 25 of the 26 patients with nonfatal outcomes, viral loads were detected that were < 1x10(9) copies/mL (P<.001). A viral load > or = 1x10(9) RNA copies/mL can be considered to predict a fatal outcome with a positive predictive value of 80%, with 88.9% sensitivity and 92.6% specificity. We suggest that viral load is a measure of the severity of CCHF.
