HPIV infection in children was associated with gut microbiota dysbiosis and serum metabolic disturbances, potentially via the gut-lung axis, and a small set of genera and metabolites showed exploratory discriminatory capacity as candidate biomarkers for further validation.
Children with severe HPIV infection had longer hospital stays and higher frequencies of several clinical symptoms than those with milder disease.
HPIV infection was associated with gut dysbiosis, with enrichment of opportunistic pathogens and depletion of beneficial commensals.
Serum untargeted metabolomics showed widespread metabolic differences between HPIV-infected children and healthy controls.
Gut genera and serum metabolites were correlated in patterns consistent with a gut-metabolite link in HPIV infection.
Four key genera and five metabolites showed exploratory discriminatory capacity for HPIV infection.
The authors propose that gut dysbiosis and metabolic disturbance in HPIV infection may act through the gut-lung axis to modulate pulmonary antiviral immune and inflammatory responses.
This study looked at children hospitalized with human parainfluenza virus (HPIV), a common cause of respiratory illness. Researchers reviewed records of 230 children and then compared gut bacteria and blood chemicals in 31 infected children with 12 healthy children. Children with severe infection stayed in hospital longer and more often had wheezing, fast breathing, difficulty breathing, and vomiting. Infected children had a different gut bacterial makeup: more bacteria that can cause problems (such as Anaerococcus, Peptoniphilus, and Finegoldia) and fewer generally helpful ones (such as Blautia, Bifidobacterium, and Faecalibacterium). Their blood also showed hundreds of altered chemicals, including fats and sugars and amino acid pathways. The harmful-type bacteria tracked with markers linked to inflammation, while Blautia tracked with the opposite pattern. This research suggests that a respiratory virus may be linked to changes in the gut and in body chemistry, possibly through a gut-lung connection. However, the study was small, showed only associations, and cannot say whether the gut changes cause or result from illness. The proposed biomarkers need testing in larger, independent groups before they could be useful, and any ideas for treatments targeting gut bacteria remain speculative.
Ren X, Liu Z, Huang L, Lai X, Wu B, Bai T, et al.. (2026). Gut microbiota and serum metabolomics in children with human parainfluenza virus infection.. Frontiers in cellular and infection microbiology. https://doi.org/10.3389/fcimb.2026.1941674