Abstract
Background: Hydrogen peroxide (H2O2) in exhaled air condensate is elevated in inflammatory disorders of the lower respiratory tract. It is unknown whether viral colds contribute
to exhaled H2O2.Aim: To assess exhaled H2O2 during and after a common cold.Methods: We examined H2O2 in the breath condensate of 20 normal subjects with acute symptoms of a common cold and after recovery 2 weeks later and, similarly, in 10 subjects without
infection. H2O2 was measured with a fluorimetric assay.Results: At the time of infection exhaled H2O2 (median, ranges) was 0.20 μM (0.03-1.2 μM), and this decreased to 0.09 μM (< 0.01-0.40 μM) after recovery