What are the clinical features of Coxsackie virus infection?

Clinical Features of Coxsackie Virus Infection

Coxsackie virus infections present with a broad clinical spectrum ranging from mild upper respiratory and gastrointestinal symptoms to severe life-threatening multiorgan disease, with specific manifestations varying by viral subtype (Group A vs. B) and patient age.

Age-Specific Presentations

Neonatal Period (Most Critical)

• Severe multiorgan disease occurs when infection is acquired perinatally (within first 7-10 days of life) 1
• Clinical features include:
  • Meningoencephalitis
  • Myocardial dysfunction/cardiomyopathy (potentially fatal)
  • Hepatitis with hepatic necrosis
  • Thrombocytopenia and disseminated intravascular coagulopathy
  • Mortality risk is significant, particularly with cardiac involvement 1
• Maternal symptoms compatible with infection prior to delivery are typically present 1

Infants and Young Children

• Coxsackie B3 infections predominantly affect children <3 years (76.6%), have the highest hospitalization rate (90.3%), and longest hospital stays (mean 7.5 days) 2
• Coxsackie A4 primarily causes herpangina (74.8% of cases) 2
• Coxsackie B4 presents with herpangina (32.3%) or tonsillitis/pharyngitis (27.4%) 2

Major Clinical Syndromes by Subtype

Coxsackie Group A

• Herpangina (most common presentation)
• Hand, foot, and mouth disease (HFMD): CV-A6, CV-A16 detected in vesicular lesions, throat, and stool 3
  • CV-A6 specifically associated with onychomadesis (nail shedding) weeks after infection 3
• Acute hemorrhagic conjunctivitis: CV-A24 (highly infectious) 3

Coxsackie Group B (More Severe Disease Potential)

• Aseptic meningitis (26.7% of CB3 cases) 2
• Myocarditis: CV-B subtypes are typically associated with cardiac involvement 3
  • Can be fatal even in previously healthy children 2
• Epidemic pleurodynia (Bornholm disease) 4, 5
• Neonatal sepsis-like syndrome (23.7% of CB3 cases present as "young infant with fever") 2
• Hepatitis and acute renal failure (rare but documented) 6

Common Clinical Features Across Subtypes

Constitutional Symptoms

• Fever present in 97.6% of hospitalized patients 2
• Myalgia
• General malaise and intoxication 7

Respiratory Manifestations

• Upper respiratory tract symptoms (mild)
• Respiratory catarrh 7
• Tonsillitis/pharyngitis

Gastrointestinal Features

• Mild GI symptoms common 4
• Virus detectable in stool for weeks to months 3

Dermatologic Manifestations

• Exanthema (maculopapular rash) 7, 8
• Vesicular lesions (HFMD)
• Severe mucocutaneous presentations (rare in adults):
  • Painful oral and genital ulcerations mimicking HSV or Behçet's disease 8
  • Acute hemorrhagic edema of infancy with targetoid purpuric lesions 9

Neurologic Involvement

• Aseptic meningitis (CSF pleocytosis with lymphocyte predominance, though acellular CSF common in infants <3 months) 3
• Encephalitis (less common than meningitis)
• Acute flaccid myelitis/paralysis (particularly EV-D68, but other enteroviruses implicated)

Other Organ Systems

• Lymphadenopathy 7
• Renal involvement: Acute glomerulonephritis with hematuric syndrome 7
• Cardiac: Pericarditis, myocarditis (potentially fatal)

Critical Complications and Long-term Sequelae

92.3% of children with complications and 91% with long-term sequelae had Coxsackie B3 infections 2, emphasizing CB3 as the most dangerous subtype. Despite this, 96.3% of infected children recover uneventfully 2.

Severe Complications Include:

• Myocarditis with heart failure
• Hepatic necrosis with coagulopathy
• Multiorgan failure in neonates
• Postviral fatigue syndrome 4
• Potential association with juvenile-onset diabetes mellitus 4

Diagnostic Considerations

Sample Collection Based on Presentation 3:

• Meningitis/encephalitis: CSF, stool, respiratory sample, blood
• Neonatal sepsis: CSF, stool, blood, respiratory sample (all required)
• HFMD/rash: Vesicle fluid (highest viral load), respiratory sample, stool
• Myocarditis: Stool, respiratory sample, blood, heart biopsy
• Conjunctivitis: Eye swab

Key Diagnostic Pitfalls:

• Prolonged viral shedding in throat and stool (weeks to months) means detection doesn't automatically prove causation 3
• Immunocompromised patients can shed virus in stool for years 3
• Viral load often higher in stool, blood, and respiratory samples than CSF 3
• RT-PCR targeting 5' non-coding region is diagnostic method of choice 3

Special Populations

Immunocompromised Patients

• Clinical presentation particularly non-specific and severe 3
• Threshold for investigation should be low, especially in patients on IgG-depleting therapies (rituximab) 3
• Prolonged viral shedding complicates diagnosis

Adults

• Generally milder disease than children 4
• Unusual presentations include severe mucocutaneous disease mimicking autoimmune conditions 8
• Marked systemic inflammatory response (leukocytosis, elevated inflammatory markers) may occur 8