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Scientists have identified distinct gene expression patterns in children with severe COVID-19 that overlap with other serious respiratory infections like RSV and tuberculosis. Analyzing blood samples from 333 South African children, researchers pinpointed 82 genes that distinguish mild from severe COVID-19 cases — a potential step toward better biomarkers and treatments for at-risk kids.
A new study published in BMC Infectious Diseases has uncovered gene expression signatures that may help explain why some children develop severe COVID-19 while others experience only mild symptoms. Researchers from the University of Southampton and the University of Cape Town analyzed blood samples from 333 children in South Africa, comparing those hospitalized with severe COVID-19, RSV, or pulmonary tuberculosis against children with mild or asymptomatic COVID-19 and healthy controls.
The team found over 5,000 genes expressed differently in children with severe infections, and identified 10 gene clusters with shared activity patterns across all three serious respiratory illnesses — pointing to common immune and cellular pathways involved in disease severity. Crucially, 82 specific genes were able to distinguish mild from severe COVID-19 cases, raising the possibility of gene-based severity indicators.
By the Numbers:
Why it matters: Lower respiratory infections are a leading cause of childhood illness and death, especially in low- and middle-income countries. These findings could lay the groundwork for early identification of high-risk children and new therapeutic targets — though larger studies are needed before clinical application.
