Overview
DNA viruses of medical importance include herpesviruses, adenovirus, papillomavirus, parvovirus B19, hepatitis B virus, and poxviruses. Laboratory pathways emphasize molecular detection and serology tailored to latency, site, and clinical syndrome.
Classification
| Family / group | Examples | Typical lab emphasis |
|---|---|---|
| Herpesviridae | HSV, VZV, CMV, EBV | PCR ± serostatus |
| Adenoviridae | Adenovirus types | NAAT/antigen as offered |
| Papillomaviridae | HPV | Molecular cytology pathways |
| Parvoviridae | Parvovirus B19 | Serology ± PCR |
| Hepadnaviridae | HBV | Serology panel ± HBV DNA |
| Poxviridae | Vaccinia/mpox context | Specialized molecular/referral |
Morphologic Features
Virion morphology is not used for routine bench ID. Mucocutaneous lesions may prompt swab collection; interpretation depends on molecular or culture methods, not Gram stain.
Laboratory Characteristics
- Lesion/CSF PCR common for HSV/VZV when ordered
- Plasma quantitative PCR for transplant-associated viruses as protocolized
- HBV marker panels require pattern interpretation
- HPV testing follows screening/diagnostic algorithms local to the laboratory
Reference Intervals
Qualitative assays use detected/not detected language. Quantitative DNA viral loads use assay-specific units and institutional interpretive or action thresholds, verify locally; do not treat published example cutoffs as universal.
| Result type | Meaning | Notes |
|---|---|---|
| IgG positive | Past exposure / serostatus | Not current load |
| IgM reactive | Possible recent infection | False positives/cross-reactivity possible |
| DNA detected | Nucleic acid in compartment | Correlate clinically |
| Quantified load | DNA copies or IU/mL | Method-specific |
Clinical and Laboratory Significance
Significance depends on specimen site, host immune status, and assay intent. Detection in CSF during compatible CNS disease differs from asymptomatic shedding at mucosal sites.
Differential Considerations
Differentiate latent seropositivity from active replication, and contamination/carryover concerns in molecular labs from true low-level viremia using local QC and repeat policies.
Comparison Tables
DNA virus assay comparison (examples)
| Feature | HSV lesion PCR | CMV plasma PCR |
|---|---|---|
| Usual question | Local active infection? | Systemic replication burden? |
| Typical report | Detected / not detected | Quantitative load |
| Serology role | Sometimes supportive | Serostatus / risk framing |
Classification Frameworks
Family names follow ICTV taxonomy. Disease staging systems (e.g., hepatitis B clinical stages) are clinical frameworks informed by laboratory marker patterns.
Laboratory Notes
- Confirm which herpesviruses are on CNS or transplant panels
- Hedge all viral load action values as institutional
- Do not interchange compartments when comparing serial results
References
Authoritative textbooks, guidelines, and reviews supporting this reference entry. Verify reference intervals, critical limits, and reflex criteria against institutional protocols and current guideline editions.
Textbooks
- Forbes BA, Sahm DF, Weissfeld AS. Bailey & Scott's Diagnostic Microbiology. 15th ed. Elsevier; 2020.
- Mahon CR, Lehman DC, Manuselis G. Textbook of Diagnostic Microbiology. 6th ed. Elsevier; 2018.
- Carroll KC, Hobden JA, Miller S, et al. Jawetz, Melnick, & Adelberg's Medical Microbiology. 28th ed. McGraw-Hill; 2019.
- Murray PR, Rosenthal KS, Pfaller MA. Medical Microbiology. 9th ed. Elsevier; 2021.
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute. Performance Standards for Antimicrobial Susceptibility Testing. CLSI document M100 (verify current edition and institutional adoption).
- Centers for Disease Control and Prevention / NIH. Biosafety in Microbiological and Biomedical Laboratories (BMBL). Current edition (verify institutional adoption).
Frequently Asked Questions
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