BreathDx - molecular analysis of exhaled breath as a diagnostic test for ventilator-associated pneumonia: protocol for a European multicentre observational study.

Background: The diagnosis of ventilator-associated pneumonia (VAP) remains time-consuming and costly, the clinical tools lack specificity and a bedside test to exclude infection in suspected patients is unavailable. Breath contains hundreds to thousands of volatile organic compounds (VOCs) that result from host and microbial metabolism as well as the environment. The present study aims to use breath VOC analysis to develop a model that can discriminate between patients who have positive cultures and who have negative cultures with a high sensitivity.

Synergistic effects of chemical insult and toll-like receptor ligands on dendritic cell activation.

There is considerable interest in the development of in vitro methods for the identification of contact sensitizers, including those that use cultured dendritic cells (DC), key players in cutaneous immune responses. Chemical allergens, such as dinitrobenzene sulfonic acid (DNBS), or skin irritants, such as benzene sulfonic acid (BS), induce modest changes in DC phenotype. In an attempt to increase the sensitivity of DC responses, DC have been co-cultured with chemical and DC activators (toll-like receptor [TLR] ligands).