by Menzies School of Health Research Squamous epithelial cell biofilms observed in bronchoalveolar lavage from children with protracted bacterial bronchitis or bronchiectasis. Representative maximum intensity projections of bronchoalveolar lavage stained with BacLight (A–B), fluorescent in situ hybridisation (FISH) probes (C–D), or haematoxylin and eosin (E–F). In BacLight images, DNA within intact (live) bacteria is stained...