Pneumocystis jirovecii in the air surrounding patients with Pneumocystis pulmonary colonization ★

• P. jirovecii was detected in the air surrounding patients colonized by P. jirovecii.
• P. jirovecii was genotyped in both pulmonary and air samples from colonized patients.
• Full genotype matches were observed in 3 pairs of air and pulmonary samples.
• The results provide original data on P. jirovecii exhalation from colonized patients.

In this study, Pneumocystis jirovecii was detected and characterized in the air surrounding patients with Pneumocystis pulmonary colonization. Air samples were collected in the rooms of 10 colonized patients using Coriolis® μ air sampler at 1 m and 5 m from the patient's head. P. jirovecii DNA was amplified and genotyped in pulmonary and air samples at the mitochondrial large subunit ribosomal RNA gene. P. jirovecii DNA was detected in 5 of the 10 air samples collected at 1 m and in 5 of the 10 other air samples collected at 5 m. P. jirovecii genotyping was successful in 4 pairs or triplets of air and pulmonary samples. Full genotype matches were observed in 3 of the 4 pairs or triplets of air and pulmonary samples. These results provide original data supporting P. jirovecii exhalation from colonized patients and emphasize the risk of P. jirovecii nosocomial transmission from this patient population.