Human Metapneumovirus (hMPV)
Human Metapneumovirus (hMPV) is a respiratory virus that causes infections similar to the flu and RSV (respiratory syncytial virus). Though less well-known, hMPV is a significant cause of illness in infants, young children, older adults, and immunocompromised individuals, including in Sri Lanka.
What Is Human Metapneumovirus?
hMPV is an enveloped RNA virus belonging to the Paramyxoviridae family, first identified in 2001. It causes both upper and lower respiratory tract infections and often circulates in the late rainy or cooler seasons, overlapping with other respiratory viruses.
Symptoms of Human Metapneumovirus Infection
Symptoms typically begin 3–6 days after exposure and may include:
- Runny nose or nasal congestion
- Cough
- Fever
- Sore throat
- Wheezing
- Difficulty breathing
- Fatigue
- Loss of appetite in infants or young children
Severe infections can lead to bronchiolitis, pneumonia, or asthma exacerbations, especially in those with underlying lung conditions.
Human Metapneumovirus in Sri Lanka
Though under-recognized, hMPV is now being identified more frequently in respiratory panels conducted at tertiary hospitals and laboratories in Sri Lanka. Co-infections with RSV, Influenza, or COVID-19 are possible and may worsen clinical outcomes.
Awareness is growing as PCR-based diagnostic tools become more widely available across the country.
How Is hMPV Diagnosed?
Accurate diagnosis requires laboratory testing, especially because hMPV cannot be reliably distinguished from other viruses based on symptoms alone. Diagnostic methods include:
- RT-PCR testing – Highly sensitive and specific
- Multiplex PCR panels – Simultaneously detect hMPV along with influenza, RSV, and other viruses
- Antigen detection – Less commonly used
Testing is recommended for patients with moderate to severe respiratory illness, especially in hospital or ICU settings.
Treatment of Human Metapneumovirus
There is no specific antiviral treatment for hMPV. Management is supportive, focusing on:
- Adequate hydration
- Oxygen therapy if needed
- Fever and cough control
- Monitoring for complications like pneumonia
Hospitalization may be necessary in high-risk or severely affected patients.
Prevention of hMPV Infection
Currently, there is no vaccine for hMPV, so prevention relies on general infection control measures:
- Hand hygiene – Wash hands frequently with soap
- Respiratory etiquette – Cover nose and mouth when coughing or sneezing
- Avoid close contact – Stay away from sick individuals
- Disinfection of surfaces – Especially in homes and childcare settings
- Isolation of symptomatic patients – In healthcare or daycare environments
Complications and Risk Groups
Severe illness can occur in:
- Infants under 2 years
- Elderly adults
- People with asthma, COPD, or heart disease
- Immunocompromised patients (e.g., cancer, transplant)
Co-infections and delayed diagnosis increase the risk of complications.
Conclusion
Human Metapneumovirus in Sri Lanka is an emerging concern, particularly during peak respiratory virus seasons. Clinicians should consider hMPV in the differential diagnosis of respiratory illness, especially in pediatric and geriatric patients. Public awareness, improved diagnostics, and infection control can reduce the impact of this underrecognized virus. For more expert insights, visit virology.lk.