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The Role of Quantitative PCR in Evaluating the Clinical Significance of Human Bocavirus Detection in Children
Maja Mijač1,2, Tomislav Meštrović3,4,5, Irena Ivković-Jureković6,7
1Clinical Microbiology Service, Dr. Andrija Štampar Teaching Institute of Public Health, 10000 Zagreb, Croatia.
Insights
Human bocavirus (HBoV) is a significant cause of pediatric respiratory infections. Higher HBoV viral loads in children correlate with more severe illness, including lower respiratory tract infections and the need for oxygen support.
Area of Science:
- Pediatric Infectious Diseases
- Virology
- Respiratory Medicine
Background:
- Human bocavirus (HBoV) is an emerging pathogen implicated in childhood respiratory infections.
- Understanding HBoV's clinical significance requires evaluating viral load and its association with disease severity.
- Quantifying HBoV in nasopharyngeal samples is crucial for assessing its impact on hospitalized children.
Purpose of the Study:
- To evaluate the clinical relevance of HBoV infection in hospitalized children with acute respiratory infections (ARIs).
- To quantify HBoV viral loads in nasopharyngeal swabs and correlate them with clinical outcomes.
- To investigate the relationship between HBoV viral load, pre-existing conditions, and disease severity.
Main Methods:
- A cohort of 957 hospitalized children with ARIs was analyzed.
- HBoV detection and quantification were performed using quantitative polymerase chain reaction (qPCR).
- A viral load threshold of 10^4 copies/mL was established to differentiate high and low concentrations.
Main Results:
- HBoV was detected in 7.6% of cases, as a sole or co-infection.
- Significantly higher HBoV viral loads were observed in children with lower respiratory tract infections (LRTIs), especially in sole HBoV infections.
- Elevated HBoV concentrations were associated with pre-existing health conditions, oxygen supplementation, and empirical antibiotic therapy.
Conclusions:
- HBoV viral load is a critical indicator of disease severity in pediatric respiratory infections.
- Higher HBoV viral loads correlate with more severe clinical presentations, including the need for respiratory support.
- Further research is needed to refine diagnostic thresholds and understand HBoV's role in co-infections for improved patient management.
Abstract:
Human bocavirus (HBoV) has emerged as a significant pathogen primarily associated with respiratory infections in children. This study aimed to evaluate the clinical relevance of HBoV infection by quantifying viral loads in nasopharyngeal swabs from hospitalized children with acute respiratory infections (ARIs) and investigating correlations with clinical outcomes. A total of 957 children were tested, with HBoV detected in 73 cases (7.6%), either as a sole infection or co-infection with other respiratory viruses. Quantitative polymerase chain reaction (qPCR) was employed to measure viral load, and a threshold of 104 copies/mL was used to differentiate high and low viral concentrations. Results have shown that children with lower respiratory tract infections (LRTIs) had significantly higher viral loads, most notably in cases where HBoV was the sole pathogen. Additionally, children with pre-existing health conditions were more likely to have elevated HBoV concentrations compared to those who were previously healthy. Children with higher viral loads were more likely to require oxygen supplementation and receive empirical antibiotic therapy, indicating a more severe clinical course. This study underscores the importance of considering HBoV viral load in clinical diagnostics, as higher concentrations were associated with more severe presentations, including the need for oxygen support. Future research should focus on refining diagnostic thresholds and exploring HBoV's role in co-infections to enhance patient care strategies.
