Epidemiological distribution of Fungal Infections Isolates from Bronchoalveolar Lavage (BAL) in Patients suffering from Chronic Respiratory Diseases in Babylon Province

Introduction

Fungal infections of the pulmonary system develop when a pathogenic fungus infects the lungs and respiratory system of the human body, normally via spores of the fungal body found in the environment (1, 11). Additionally, the pulmonary system is the primary target for the infections. The infections can also spread to other parts of the body system, especially for patients with certain risk factors (2, 4). Consequently, over the recent past, the rate of systemic fungal infections has risen remarkably, especially for immunocompromised patients (3). This can be attributed to various clinical factors, including the increased rate of the use of antibiotics, immunosuppressive agents, medical procedures, as well as the increased rate of comorbid conditions such as (AIDS), cancer, and immune senescence. (4,6,11).

Pulmonary fungal infections have Shifting from rare opportunistic infections to major clinical challenges in both immunocompromised and chronically ill populations. Global epidemiological shifts indicate increasing prevalence of non-albicans Candida and filamentous fungi, accompanied by rising antifungal resistance. This evolution is strongly associated with prolonged antibiotic exposure, intensive care admission, corticosteroid therapy, diabetes mellitus, and invasive pulmonary procedures.

Additionally, clinical data which collected in several regions indicate that candidiasis is a leading cause of fungal-related mortality, accounting for (50 - 71%) of deaths in hospital settings (7, 15). Subsequently, Candida albicans remains the most prevalent species in these cases, there is a notable emergence of non-albicans species, especially in Intensive Care Units (ICUs) (5, 8). Therefore, epidemiological studies in Europe have reported higher mortality rates for non-albicans infections (47%) compared to C. albicans (32%), often due to the multi-drug resistant nature of these strains (7,13). Furthermore, rare molds such as Mucor and Fusarium are increasingly identified in patients with hematological malignancies, further complicating therapeutic outcomes (4,9). Consequently, the other significant respiratory threats include Aspergillus, Cryptococcus, and Pneumocystis jirovecii, fungal infection include in other study (10, 16, 17).

Although in Iraq environmental dust exposure, high diabetes prevalence, and expanding ICU services may further shape the regional fungal landscape. However, robust analytical studies incorporating antifungal susceptibility testing and regression-based risk modeling remain limited. Whereas, this study integrates microbiological characterization

with inferential statistical modeling to provide clinically applicable regional data.

Medical advances are still under development, and the fungal pathogens are still a challenge for modern medicine. Moreover, studies have shown the prevalence of the fungal infections among the patients suffering from pulmonary diseases in Iraq. (18, 19). Following this, a previous study was conducted to determine the prevalence of opportunistic fungal pathogens, which cause infections for the patients suffering from COPD, in the Babylon province of Iraq. (21, 22). Accordingly, the main aim of the current study was to determine the prevalence of fungal pathogens in the BAL fluids of the patients suffering from respiratory distress in the Imam Al-Sadiq Teaching Hospital, Al-Hilla, Babylon province, Iraq.

Materials and Methods

Results

Discussion

The present study demonstrated a relatively high fungal recovery rate 41.7% (40/96) in bronchoalveolar lavage (BAL) samples from patients with chronic respiratory diseases in Al-Hilla, Iraq. While fungal recovery from BAL does not inherently confirm invasive infection, this substantial burden suggests that chronic respiratory distress may often mask underlying fungal colonization or subclinical infection. The findings of the study support the growing evidence of opportunistic fungal pathogens being identified in the patient with chronic respiratory disease and the hospitalized patient (4,5).

Candida species were found to be responsible for 45% (18/40) of all the fungal isolates. Among the candida isolates, non-albican candida species were found to be higher by 55% (10/18) compared to the candida albicans isolates (8/18). This is a reflection of the epidemiological findings of the gradual shift from the dominance of candida albicans to the non-albicans species. The increased prevalence of non-albicans species is of clinical importance since the non-albicans species are found to have reduced sensitivity to the commonly used azole antifungal agents. (12, 13, 8). Typically, our study is agreeing with findings in Babylon Province, where Candida was identified as the leading opportunistic isolate in patient suffering from COPD (21). Additionally, the detection of Mucorales isolates (20%) in our results was higher than reported in northern Iran patients (19). This discrepancy likely stems from the arid climate and increased dust exposure characteristic of central Iraq, which facilitates the dispersion of environmental fungal spores (24). Furthermore, our study disagrees with patterns observed in Cameroon (14). In terms of gender distribution,

reinforcing the need for the necessity for region-specific surveillance to allow for environmental/demographic variation. In contrast, Predictors of Fungal Isolation - a multivariate analysis using logistic regression identified two primary independent predictors for the recovery of fungi such as Prolonged Corticosteroid Therapy (Adjusted OR = 3.1, p = 0.008) This was found to be the most powerful predictor, as observed in the studies by Sai Saran and Azim (3). Additionally, Corticosteroids inhibit the activity of macrophages and neutrophils, thereby creating a conducive environment for the transition of fungi from colonization to tissue invasion. On the contrary,

Diabetes Mellitus (Adjusted OR = 2.5, p = 0.02) in the context of "immunometabolic" disorders due to hyperglycemia, including the impairment of neutrophil chemotaxis, is conducive for the growth of fungi, especially Mucorales. This is in conformity with multicenter studies from Egypt and Jordan and others (25).

Moreover, although "patient with (ICU admission)" was significant in the univariate analysis, it did not have statistical independence in the adjusted model. This shows that the ICU admission status is a surrogate for comorbid states rather than being directly related to the recovery of the fungus (2).

Lastly, antifungal resistance and clinical implications covered a percentage of (28%) resistance rate to fluconazole among Candida isolates, mainly caused by non-albicans Candida spp. such as C. krusei, which is a major clinical problem as shown in this study. These findings are consistent with the recent trend reported by (12, 13). Finally, antifungal susceptibility testing revealed a notable resistance rate to fluconazole among Candida isolates, particularly among non‑albicans species. The presence of azole resistance represents an important clinical concern because fluconazole is frequently used as empirical therapy in many healthcare settings. In contrast, high susceptibility rates were observed for voriconazole and amphotericin B, indicating that these agents may remain effective treatment options for fungal infections in this region.

Study limitations

Despite the clinical implications of these findings, certain limitations should be taken into consideration. For one, this study was carried out in a single hospital setting with a relatively small sample size, which may limit its scope or application to other areas in Iraq. Second, this study used conventional microbiological methods to identify fungal pathogens. Although these methods are still widely used today, integration with molecular techniques such as PCR as a molecular diagnostic test or MALDI-TOF could improve the accuracy of fungal pathogen identification and detection. Lastly, this study was only carried out over a span of three months and may not take into consideration any possible seasonal variation in environmental exposure to fungal pathogens. Future research should be carried out over a longer span to obtain a more detailed understanding of the epidemiology of fungal infections in Iraq.

Conclusion

This research will give a definitive characterization of the fungal infections that exist within the lower respiratory tract of patients within the Al-Hilla area in Iraq. The results will give a conclusive ending to the fact that fungal colonization and infections within the respiratory tract of patients with chronic respiratory distress syndromes are highly prevalent, with the main causative agent being Candida and Mucor.

The high incidence rate of the isolation of non-albicans Candida spp. especially Candida krusei from elderly male patients indicates a developing epidemiological shift that requires a transition from

empirical to sensitivity-based therapy. In addition, the high incidence rate of filamentous fungi such as Mucor and Rhizopus in the Babylon province in Iraq indicates a strong environmental influence on pulmonary infections that requires a high level of caution. This research will also give a conclusive ending to the fact that the utilization of BAL fluid as a diagnostic tool for the identification of pulmonary mycoses infections is critical in the field of medicine.