Pulmonary mycoses among pulmonary tuberculosis in Kebbi State North Western Nigeria

Abstract

Background Pathogenic fungi are the source of the fungal illness known as pulmonary mycosis. The prevalence of pulmonary mycoses among patients with pulmonary tuberculosis is continuously rising, despite improvements in the disease’s diagnosis, treatment, and management. Three hundred clinically confirmed patients with pulmonary tuberculosis were recruited for this study. Sputum samples were collected and analyzed to detect M. tuberculosis using the GeneXpert machine. Fungal elements were determined using microscopy, culture, and fungal biochemical analysis. Fungal isolates were confirmed using nested PCR with the internal transcribed sequence region of the ribosomal cistron of the fungal species. Results Of the 300 sputum samples analyzed, 50 (16.7%) patients had pulmonary tuberculosis. Fungi pathogens were found in 142 patients (47.3%), with 99/142 (71.2%) primary infections, and 40/139 (29.5%) secondary infections. Among the secondary infections, 33 (11%) were fungi coinfections with rifampicin-sensitive MTB coinfections, while 7 (2.3%) were fungi co-infected with rifampicin-resistant MTB. Candida albican was the most common fungus isolate, accounting for 44 (31.7%), while non-Candidal albicans accounted for only 2 (1.4%). Of the 99 species responsible for primary infection, 33 (23.7%) were Blastomyces precursors, 30 (21.6%) were Candida species, and 21 (15.1%) were Aspergillus fumigatus. The fungal pathogen with the highest frequency of secondary infection was Candida species 14 (10.1%), followed by Aspergillus fumigatus 11 (7.9%), then Blastomyces precursors, and then 09 (6.5%). Conclusion In conclusion, this study determined the prevalence rate of fungal pathogens among pulmonary tuberculosis patients. The most dominant species observed were Blastomyces species, which are seldom reported in Africa and Nigeria. The two others were Aspergillus and Candida species. The study showed that a high percentage of cases of this species, responsible for pulmonary mycosis, were misdiagnosed and treated as pulmonary tuberculosis. Thus, there is a need for improved surveillance and accurate diagnosis of pulmonary infections for proper treatment.