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A multispecies outbreak of Nocardia occurred among heart transplant recipients (HTR), but not lung transplant recipients (LTR), in Sydney, New South Wales, Australia, during 2018-2019. We performed a retrospective review of 23 HTR and LTR who had Nocardia spp. infections during June 2015-March 2021, compared risk factors for Nocardia infection, and evaluated climate conditions before, during, and after the period of the 2018-2019 outbreak. Compared with LTR, HTR had a shorter median time from transplant to Nocardia diagnosis, higher prevalence of diabetes, greater use of induction immunosuppression with basiliximab, and increased rates of cellular rejection before Nocardia diagnosis. During the outbreak, Sydney experienced the lowest monthly precipitation and driest surface levels compared with time periods directly before and after the outbreak. Increased immunosuppression of HTR compared with LTR, coupled with extreme weather conditions during 2018-2019, may explain this outbreak of Nocardia infections in HTR.
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http://dx.doi.org/10.3201/eid2811.220262 | DOI Listing |
Ther Adv Respir Dis
July 2025
Department of Respiratory Medicine, The First Affiliated Hospital of Zhengzhou University, No. 1 Longhu Middle Ring Road, Zhengzhou 450000, China.
Background: The escalating morbidity and mortality of chronic obstructive pulmonary disease (COPD) necessitates improved diagnostic approaches for comorbid infections. COPD patients exhibit heightened susceptibility to opportunistic pathogens like Nocardia species due to compromised airway defenses and frequent glucocorticoid/immuno-suppressant use. Despite its clinical significance, Nocardia infection remains diagnostically challenging due to nonspecific presentations and imaging features.
View Article and Find Full Text PDFWorld J Clin Cases
July 2025
Department of Nephrology and Rheumatology, Tongde Hospital of Zhejiang Province, Hangzhou 310012, Zhejiang Province, China.
Background: Nocardiosis is a rare bacterial infection with unclear epidemiology, pathogenesis, and characteristics. Its clinical manifestations are diverse and nonspecific, making diagnosis prone to errors, including misdiagnosis and missed diagnosis. Additionally, this disease is difficult to treat, often requiring months or even years of antibacterial therapy, and can be fatal in patients with underlying conditions.
View Article and Find Full Text PDFMicrobiol Spectr
August 2025
Department of Pathology and Laboratory Medicine, Cummings School of Medicine, University of Calgary, Alberta, Canada.
The role of specific species in human infections continues to expand as advanced methods enable species/species complex identification. We conducted a multiyear population-based (2010-2022) characterization of invasive spp. Isolates were analyzed using matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) and 16S rRNA gene sequencing.
View Article and Find Full Text PDFInfez Med
June 2025
Department of Infectious Disease, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal 576104, India.
Introduction: Nocardiosis is a common cause of pneumonia in immunocompromised individuals. Limited data regarding its epidemiology, clinical presentations, and outcomes in India are available. This systematic review analysed the clinical profile and outcomes of pulmonary nocardiosis in India.
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