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Diagn Cytopathol ; 51(10): E279-E282, 2023 Oct.
Article in English | MEDLINE | ID: mdl-37318778

ABSTRACT

Despite antimicrobial prophylaxis, 34% to 59% of lung transplant recipients experience severe life-threatening opportunistic infections, sometimes caused by Nontuberculous Mycobacteria (NTM) and Nocardia. Although differentiating these infections is of utmost importance for effective treatment, it can be challenging as they share morphological and growth characteristics. Therefore, culture remains the gold standard for laboratory confirmation. With the aid of novel molecular methods performed on the cultured organisms, diagnosis may be accomplished rapidly and precisely. We present a case of a lung transplant recipient with a pulmonary infection where long, thin, beaded, branching filamentous organisms were seen with Acid-Fast Bacilli (AFB) and Modified Gomori's Methenamine Silver (GMS) stains in bronchoalveolar lavage sample. Cytological characteristics led to the suspicion of a Nocardia species infection. However, culture and the PCR-restriction fragment length polymorphism analysis (PRA) identified M. fortuitum. Additionally, antibiotic resistance was detected, which aided in choosing the appropriate treatment. Therefore, to overcome such diagnostic difficulties to differentiate NTM and Nocardia, a multidisciplinary approach including culture, molecular methods, and cytology is needed to enhance clinical outcomes.


Subject(s)
Nontuberculous Mycobacteria , Transplant Recipients , Humans , Nontuberculous Mycobacteria/genetics , Lung , Polymerase Chain Reaction/methods , Bronchoalveolar Lavage
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