Viral Pathogens That Cause Pericarditis
Multiple viral pathogens can cause pericarditis, with DNA viruses (particularly parvovirus B19, Epstein-Barr virus, and human herpesvirus 6) being detected more frequently and at higher viral loads than RNA viruses in pericardial tissue. 1
RNA Viruses
The following RNA viruses have been identified as causative agents:
Enteroviruses (Most Common RNA Viruses)
- Coxsackieviruses Group A: A4, A16
- Coxsackieviruses Group B: CVB2, CVB3, CVB4
- Echoviruses: Various subtypes
These enteroviruses cause direct cytolytic or cytotoxic effects on cardiac tissue 1
Influenza Viruses
- Influenza A subtypes: H1N1, H5N1, H3N2
Other RNA Viruses (Less Common)
- Chikungunya virus
- Human coronavirus NL-63
- Respiratory syncytial virus
- Dengue virus
DNA Viruses (More Frequently Detected)
DNA viruses are present at greater frequencies and higher viral DNA copy numbers compared to RNA viruses in pericardial biopsies and fluid 1:
Parvovirus B19
- Detected at very high viral loads (up to 7 × 10⁶ genome equivalents/μg DNA)
- Predominantly found in epicardial tissue
- Recently recognized as causing complicated effusive-constrictive pericarditis 2
Herpesviruses
- Epstein-Barr virus (EBV): Most frequently found in pericardial fluid
- Human herpesvirus 6 (HHV-6): Common in pericardial tissue
- Cytomegalovirus (CMV): Mainly in immunocompromised and HIV patients
- Varicella zoster virus: Rarely detected
- Herpes simplex virus: Rarely detected
These herpesviruses cause inflammation through T and B cell-driven immune-mediated mechanisms 1
Adenoviruses
- Only rarely detected in pericarditis patients 1
Special Populations
HIV-Associated Pericarditis
In developing countries with delayed antiretroviral therapy rollout, HIV-associated inflammatory reactions of the pericardium are common complications, often related to tuberculosis co-infection 1
Important Clinical Caveats
Routine viral serology is NOT recommended (Class III recommendation) because there is no correlation between antiviral antibodies in serum or virus isolation from throat/rectal swabs with actual viral presence in pericardial tissue 1. The definitive diagnosis requires comprehensive workup of pericardial fluid and peri-/epicardial biopsies using PCR techniques 1.
Viral persistence without active replication can sustain ongoing inflammation through autoimmune processes directed against cardiac proteins by molecular mimicry, particularly with herpesviruses and parvovirus B19 1. This explains why some patients develop recurrent or constrictive pericarditis even after the acute viral infection has resolved.