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Background: Protozoa have the ability to replace the human lung. Over recent years, the incidence of pulmonary infections caused by these microorganisms has increased, particularly in individuals with an immunodeficiency. The use of appropriate diagnostic methods is particularly important in the identification of parasites in pulmonary secretions. Objectives: The present study aimed to evaluate and compare PCR-based diagnostic methods with the gold standard method to detect three pathogenic protozoa, including Toxoplasma, Cryptosporidium, and Microsporidia in bronchoalveolar lavage (BAL) samples obtained from immunocompromised patients with chronic obstructive pulmonary disease. Methods: A BAL sample of immunodeficient patients suffering from chronic obstructive pulmonary disease (COPD) was examined by direct microscopy and PCR methods. Results: In this study, we examined 64 patients with immunodeficiency accompanied by COPD. Microsporidia were not identified in the samples. Direct methods identified three and nine cases of Toxoplasma and Cryptosporidium, respectively. However, the molecular method identified two and two cases of pulmonary infection with these parasites. Conclusions: Determining the standard diagnostic method for parasites is dependent on factors, such as the type of specimen and the type of parasite. Based on the results of the present study, the direct microscopic method is the optimal diagnostic method for Toxoplasma and Cryptosporidium in BAL samples.

Competency Assessment: Diagnostic Methods for Detection of Cryptosporidium, Microsporidia, and Toxoplasma in Bronchoalveolar Lavage Samples