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Updated: Jun 17, 2026

Experimental Model to Evaluate Resolution of Pneumonia
Published on: February 17, 2023
Pneumocystis colonization in older adults and diagnostic yield of single versus paired noninvasive respiratory
Sergio L Vargas1, Patricia Pizarro, Mónica López-Vieyra
1Programa de Microbiología, Instituto de Ciencias Biomédicas, Facultad de Medicina Universidad de Chile, and 2Consultorio Agustín Cruz Melo, Independencia, Santiago, Chile. svargas@terra.cl
Abstract:
The presence of Pneumocystis was assessed in oropharyngeal wash specimens from 110 adults (median age, 76 years; age range, 69-95 years), 66 of whom had a paired nasal swab specimen. Pneumocystis jirovecii DNA was detected in 12.8% of oropharyngeal wash specimens, and the frequency increased to 21.5% in paired specimens. Pneumocystis colonization is prevalent in older adults. Double noninvasive sampling increases the diagnostic yield.
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