Pneumocystis jirovecii colonization in chronic pulmonary disease S. Gutiérrez, N. Respaldiza, E. Campano, M.T. Martínez-Risquez, E.J. Calderón and C. De La Horra Parasite, 18 2 (2011) 121-126 Published online: 15 May 2011 DOI: 10.1051/parasite/2011182121