# Classroom bacteria and children's respiratory health

> Live situation record from CLSTR: https://clstr.news/situations/classroom-bacteria-and-childrens-respiratory-health
> Updated: 2026-09-09T07:38:44.000Z. Sources: 5. Developments: 2.

Research presented at the European Respiratory Society Congress indicates that specific bacterial groups found in classroom dust, namely Streptomyces and Mycobacterium spp., are associated with reduced lung function in children. The study utilized data from the SINPHONIE study, covering approximately 300 classrooms across 22 European countries, to assess how exposure to these soil-derived bacteria impacts respiratory capacity.

Follow-up reports characterize the observed reduction in lung function as ‘mild’ but emphasize the importance of indoor air quality in schools. Alongside these findings, medical professionals have noted an increase in respiratory infections at the beginning of the school year, noting that children’s immature immune systems may lead to higher viral loads and increased transmission.

## Claims

- Children are more vulnerable to respiratory viruses because their immune systems are not yet mature. (corroborated by 2 sources)
- Children act as significant transmitters of viruses due to biological factors and behavior. (corroborated by 2 sources)
- Soil-derived bacteria in classroom dust are linked to a slight decrease in children's lung function. (single source)
- A study covering 22 European countries identified a correlation between specific bacteria in suspended particles and altered pulmonary parameters in students. (single source)

## Timeline

### 2026-09-09: European study links classroom bacteria to children's lung health

A study across 22 European countries links classroom dust bacteria to slight decreases in children's lung function, while doctors warn of increased respiratory virus transmission during the school season.

3 sources. https://clstr.news/cluster/european-study-links-classroom-bacteria-to-childrens-lung-health

### 2026-09-06: Classroom dust bacteria linked to reduced lung function in children

Research presented in Barcelona suggests that Streptomyces and Mycobacterium bacteria found in classroom dust are linked to reduced lung function in children across Europe.

2 sources. https://clstr.news/cluster/classroom-dust-bacteria-linked-to-reduced-lung-function-in-children

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Cite as: Classroom bacteria and children's respiratory health. CLSTR, https://clstr.news/situations/classroom-bacteria-and-childrens-respiratory-health