Markers Correlated with Severe Pediatric Adenovirus Pneumonia

In a pediatric adenovirus pneumonia cohort, investigators in China examined whether routine laboratory indices and a serum cytokine panel differed between children hospitalized with adenovirus pneumonia confirmed by PCR or gene sequencing who were classified as mild versus severe, alongside comparisons with healthy controls.

The report describes 100 pediatric cases (55 mild and 45 severe) and 40 control cases and presents correlation testing and receiver operating characteristic (ROC) analyses that highlight neutrophil measures and interleukin-6 (IL-6) among the parameters most closely aligned with severity.

The authors describe a single-center study in which clinical data, selected laboratory results, imaging findings, and serum cytokines were collected, with laboratory and imaging assessments obtained on the first day of hospitalization. For cytokine testing, they describe collecting 2 mL of fasting venous blood into dry tubes, allowing samples to stand at room temperature for 60 minutes, centrifuging at 1500 rpm for 10 minutes, and transferring separated serum to sterile EP tubes for storage at −80 °C. Cytokines were measured using an immunofluorescence luminescence microsphere kit and read on a calibrated BD FACS Canto II flow cytometer, with BD FACSDiva used for acquisition and FCAP Array v3 for curve fitting and concentration derivation.

Routine laboratory comparisons were reported to distinguish severe from mild cases, with higher white blood cell counts and neutrophil indices in the severe group, alongside higher lactate dehydrogenase (LDH) and C-reactive protein (CRP); these measures were also described as positively correlated with disease severity on Spearman analysis. In parallel, the cytokine panel was reported to show broad post-infection elevations, particularly in severe pneumonia, with several cytokines described as positively correlated with severity, including IL-6, IL-2, IL-8, IL-17F, and TNF-β. The authors also describe IL-10 as elevated in severe cases, presenting it as part of the overall inflammatory and regulatory cytokine pattern observed in their dataset.

For discrimination of severe disease status, the authors’ ROC analysis for neutrophil count and IL-6 reported a neutrophil cutoff of 6.03 × 109/L with sensitivity 82.2%, specificity 72.7%, and AUC 0.830, and an IL-6 cutoff of 41.823 pg/mL with sensitivity 75.6%, specificity 81.8%, and AUC 0.833, which the authors describe as potentially helping to discriminate severe from mild cases in this dataset. Separately, the paper reports higher pulmonary consolidation frequency on first-day chest CT in the severe group (33.4%) than the mild group (1.8%), and a higher proportion of ICU transfer in severe cases (17.8% vs 1.8%).

The authors cite limitations including a single-center investigation with a limited sample size, no adenovirus serotype identification, and cytokine measurements captured as a single time-point (cross-sectional) snapshot, and they call for multicenter validation and prospective or dynamic measurement approaches to test generalizability.