Human Bocavirus Infections in Pediatric Respiratory and Gastrointestinal Diseases

The human bocaviruses (HBoVs) are small, non-enveloped DNA viruses within the Parvoviridae family that have emerged over the past two decades as notable pathogens in paediatric respiratory and gastrointestinal disease. Four genotypes (HBoV1–4) have been identified, with HBoV1 most frequently implicated in acute respiratory tract infections and HBoV2–4 detected in stool samples from children with gastroenteritis. HBoV1 is endemic worldwide and often presents in children under the age of five with symptoms ranging from mild upper respiratory illness to bronchiolitis, pneumonia and wheezing. Gastrointestinal manifestations, though less common, include diarrhoea and vomiting associated with HBoV2–4. Co-infection with other respiratory or enteric viruses is frequent, complicating the attribution of disease. The virus exhibits remarkable persistence in respiratory secretions and can maintain detectable DNA well beyond acute illness. Viral load in respiratory specimens has been correlated with disease severity, and recent advances in molecular diagnostics—quantitative PCR, serology and mRNA detection assays—have refined case definitions. At the cellular level, HBoV replicates in differentiated airway epithelia by hijacking DNA damage and repair pathways and may employ epitranscriptomic modifications to optimise replication. Despite these insights, the precise pathogenic mechanisms, host immune responses and full burden of gastrointestinal disease remain under investigation. Continued research is essential to inform targeted therapies, improve diagnostic accuracy and guide vaccine development.

Research from Nature Portfolio

A major retrospective analysis reviewed over 650 hospitalised children with confirmed HBoV infection and demonstrated that high viral loads in nasopharyngeal aspirates are an independent predictor of severe lower respiratory tract disease. Younger children with elevated HBoV titres were more likely to present with wheeze, tachypnoea and oxygen requirement, and less prone to viral co-infection than those with lower loads. These findings reinforce the concept of viral load as a quantitative biomarker for clinical risk stratification in paediatric respiratory infections.

Human Bocavirus Infections in Pediatric Respiratory and Gastrointestinal Diseases publication trend

The graph below shows the total number of articles in human bocavirus infections in pediatric respiratory and gastrointestinal diseases across all publications each year (not limited to Nature Index journals).

Technical terms

Parvoviridae: A family of small, single-stranded DNA viruses that infect vertebrates.

Nasopharyngeal aspirate: A respiratory sample obtained by suction from the upper airway, commonly used for viral detection.

Viral load: The quantity of viral genome copies per unit volume in a clinical specimen, indicative of infection intensity.

N6-methyladenosine (m6A): A reversible chemical modification of RNA that can regulate stability and function of viral and cellular transcripts.

Rolling-hairpin replication: A mechanism by which parvoviruses generate new DNA strands using terminal hairpin structures as primers.

References

1. N6-methyladenosine modification of a parvovirus-encoded small noncoding RNA facilitates viral DNA replication through recruiting Y-family DNA polymerases. Proceedings of the National Academy of Sciences of the United States of America (2024).
2. HBoV-1: virus structure, genomic features, life cycle, pathogenesis, epidemiology, diagnosis and clinical manifestations. Frontiers in Cellular and Infection Microbiology (2023).
3. A Novel Bocavirus Associated with Acute Gastroenteritis in Australian Children. PLOS Pathogens (2009).
4. Replication of an Autonomous Human Parvovirus in Non-dividing Human Airway Epithelium Is Facilitated through the DNA Damage and Repair Pathways. PLOS Pathogens (2016).
5. Clinical significance of different virus load of human bocavirus in patients with lower respiratory tract infection. Scientific Reports (2016).
6. Detection of Spliced mRNA from Human Bocavirus 1 in Clinical Samples from Children with Respiratory Tract Infections - Volume 19, Number 4—April 2013 - Emerging Infectious Diseases journal - CDC. Emerging Infectious Diseases (2013).