Chronic Medical Conditions Increase Adult Hospitalization Risk for HMPV in NZ
Overview
This study from Auckland, New Zealand, found that adults with chronic medical conditions (CMCs) had significantly higher hospitalization rates for human metapneumovirus (HMPV) from 2012 to 2015. Congestive heart failure, coronary artery disease, and chronic obstructive pulmonary disease were associated with the highest risks, with variations by age and ethnicity.
Background
Human metapneumovirus (HMPV) is a respiratory virus identified in 2001, known to cause acute respiratory infections especially in children and older adults. While its impact on immunocompromised patients is established, less is known about risks in adults with chronic medical conditions (CMCs). Previous studies lacked population-based risk assessments for HMPV among adults with specific CMCs. This study aimed to fill that gap by linking surveillance data with population health records to estimate HMPV hospitalization risks by CMC type, age, and ethnicity.
Data Highlights
Chronic Medical Condition
Incidence Rate Ratio (IRR) Range
Age Group
Ethnicity with Highest Risk
Congestive Heart Failure (CHF)
7.0–23.0
≥50 years
Māori/Pacific adults
Coronary Artery Disease (CAD)
4.2–9.1
≥50 years
Not specified
Chronic Obstructive Pulmonary Disease (COPD)
6.7–11.9
≥50 years
Non-Māori/Pacific adults
Adults with ≥2 CMCs
Higher than those without CMCs
Varied by age and ethnicity
Varied
Key Findings
Adults with any chronic medical condition had significantly higher HMPV hospitalization rates than those without.
Congestive heart failure posed the highest risk for HMPV hospitalization across age groups, especially in Māori/Pacific adults.
Coronary artery disease and chronic obstructive pulmonary disease were also strongly associated with increased hospitalization risk in adults aged 50 and older.
Risk of hospitalization increased further in adults with two or more chronic medical conditions.
Age and ethnicity influenced the relationship between specific CMCs and HMPV hospitalization risk, with some variation by condition.
Clinical Implications
Clinicians should recognize that adults with chronic medical conditions, particularly congestive heart failure, coronary artery disease, and COPD, are at elevated risk for severe HMPV infection requiring hospitalization. Awareness of increased risk in Māori/Pacific populations with CHF highlights the need for targeted prevention strategies. Future HMPV vaccines or antiviral interventions may be prioritized for these high-risk groups to reduce morbidity.
Conclusion
This population-based study demonstrates that chronic medical conditions significantly increase the risk of HMPV-associated hospitalization among adults, with important variations by age and ethnicity. These findings support prioritizing adults with specific CMCs for future HMPV prevention efforts.
References
SHIVERS Project, New Zealand Ministry of Health, 2012–2015 -- Evaluating the Influence of Chronic Health Issues on Hospitalization Rates for Human Metapneumovirus Among Adults in New Zealand
