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The Egyptian Journal of Internal Medicine
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Strongyloidiasis co-occurrence with tuberculosis and aspergillosis in immunocompromised patients: a global scoping review

The Egyptian Journal of Internal Medicine volume 36, Article number: 87 (2024) Cite this article

Abstract

Reports on cases of strongyloidiasis and tuberculosis or aspergillosis coinfection are fragmented in the literature and no large-scale reviews are describing its occurrence across the globe. We identified a total of 230 cases of strongyloidiasis and tuberculosis coinfection amongst 2376 participants with tuberculosis disease from eight epidemiological surveys conducted in Ethiopia (n = 4, 50%); Tanzania (n = 3, 37.5%) and Malaysia (n = 1, 12.5%). Clinical outcomes in these studies were not stated as they were largely descriptive. In addition, there were ten individual case reports of strongyloidiasis and tuberculosis coinfection. Of the ten, four were from the USA (40%), two each from India (20%) and Japan (20%), and one each from the UK (10%) and Argentina (10%). Of the ten, six had favourable outcomes, two were fatal and outcomes were unclear in the remainder. Ten cases of strongyloidiasis and aspergillosis coinfection were identified, five were reported from the USA (50%), and one each from the Netherlands (10%), China (10%), Iran (10%), Colombia (10%) and Italy (10%). Five each had favourable and fatal outcomes. Fatal outcomes in strongyloidiasis and tuberculosis or aspergillosis coinfection were associated with steroid therapy (n = 3), decline for treatment (n = 1), delayed diagnosis (n = 2) and delayed presentation (n = 1). Our findings suggest a significant proportion of individuals living with tuberculosis are also affected with strongyloidiasis, especially in sub-Saharan Africa. However, more studies are required to ascertain the burden of strongyloidiasis and tuberculosis coinfection as few cases were reported from other highly burdened tuberculosis regions. In addition, the role of the attending clinician is critical to reduce morbidities from the coexistence of these clinical entities as a significant number of cases with documented outcomes were fatal.

Introduction

Strongyloidiasis is a parasitic infection, mainly caused by the soil-transmitted helminth, Strongyloides stercoralis [1]. Sporadic infections with Strongyloides fuelleborni also occur in Africa and Papua New Guinea [2]. It is estimated to affect 613.9 million people with a global prevalence of 8.1%, predominantly reported in the South-East Asia region estimated at 237.3 million, followed by the Western Pacific region with 133.2 million, and the African region with 108.1 million [3]. The portal of infection in humans is mainly via the penetration of the skin or mucous membranes by the filariform larvae during autoinfection or via the faecal-oral route. The larvae then migrate through the lymphatics and venules to the lungs and into the alveolar spaces causing inflammatory responses often associated with eosinophilic infiltration and pneumonitis. The parasite enters the gut from the lungs and becomes the parthenogenetic female [2].

The symptomatology of strongyloidiasis is often negligible or without clinical manifestations and can persist for several years in the immunocompetent human host [1]. On the other hand, it can cause a debilitated form of illness in the immunocompromised including cancer patients and following their exposure to chemotherapy, patients on organ transplant, prolonged steroid use, human T-lymphotropic virus (HTLV) infection, rheumatic diseases and HIV/AIDS patients often leading to fatal outcomes [1, 4,5,6]. The associated factors predisposing to strongyloidiasis hyperinfection or disseminated disease are also critical in setting the stage for tuberculosis (TB) and opportunistic fungal diseases like aspergillosis. The reason for the possible coexistence of these diseases is that they are often associated with impaired immunity. Strongyloidiasis impedes the human immune response to TB and can thus lead to the reactivation of latent TB or worsen an ongoing TB disease [7]. Also, S. stercoralis coinfection in pulmonary TB patients is associated with an increased risk of cavitation leading to a greater disease severity and higher bacterial burden [8]. Cavitations on their own are a major risk factor for chronic pulmonary aspergillosis as studies have shown increasing rates amongst post-TB treated patients [9]. Similarly, as the pathogenesis of these diseases involves the lungs, their clinical presentation may mimic each other thus masking an early diagnosis and initiation of appropriate treatment [10,11,12]. This is besides already existing intricacies in the prompt diagnosis of fungal diseases as they are often misdiagnosed as TB or missed in many cases coexisting with TB thus increasing morbidity and mortality [13,14,15,16]. Current estimates show that about 3.8 million individuals die from fungal diseases globally [17], and a total of 1.3 million people are dying from TB as of 2022 (WHO). The attending physician’s cognizance of this interrelation is critical to patient management and obtaining favourable outcomes. Clinicians the world over need to be in touch with these trends to improve diagnosis thereby reducing morbidity. This underpins the essence of this review as large-scale reviews on this subject are currently lacking in the literature. We highlight documented studies and case reports of strongyloidiasis coexisting with TB or aspergillosis to drive awareness of early diagnosis and treatment which would invariably improve clinical outcomes.

Methods

We conducted a literature search using PubMed and Google Scholar to identify case reports, case series and observational studies reporting strongyloidiasis coinfection with TB or aspergillosis. The search duration was from inception to February 2024. The search was done using Medical Subject Headings (MeSH) terms and keywords with an appropriate combination using Boolean operators ‘AND’ and ‘OR’. The search algorithm was ((‘strongyloides’ OR ‘strongyloidiasis’) AND (‘tuberculosis’)) OR ((‘strongyloides’ OR ‘strongyloidiasis’) AND (‘aspergillosis’)). References in all relevant papers were further reviewed for additional publications on studies regarding the subject of this review. We excluded reviews and other articles not relevant to the subject of this review. Data on study authors, location, year of publication, type of study, age, sex, clinical presentation, comorbidities, risk factors, immunosuppressive therapy, method of diagnosis, treatment and outcomes were extracted.

Results

We identified 18 articles reporting strongyloidiasis and TB coinfection. Of the 18, eight (44.4%) were epidemiological surveys and ten (55.6%) were individual case reports. Of the eight surveys, four (50%) were studies conducted in Ethiopia, three (37.5%) were done in Tanzania and one (12.5%) from Malaysia. Five (62.5%) were hospital-based studies, two (25%) were community-based studies and in one (12.5%), participants were recruited from both community and hospital. Overall, a total of 230 cases were reported from 4137 participants. Clinical outcomes in these studies were however not stated as they were largely descriptive (Table 1).

Table 1 Epidemiological surveys documenting a co-infection between strongyloidiasis and tuberculosis
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Looking at the case reports, of the ten, four were from the USA (40%), two each from India (20%) and Japan (20%), and one each from the UK (10%) and Argentina (10%). Four were males with a male-to-female ratio of 0.6:1. The mean age (± standard deviation) was 37.7 (± 20.4) and a range of 7 to 73 years. Predominant clinical features were abdominal pain/distention (n = 5) followed by fever (n = 4) and weight loss (n = 2). Associated comorbidities and predisposing factors were malnutrition (n = 2), vitamin B12 deficiency (n = 1), peptic ulcer (n = 1), syndrome of inappropriate antidiuretic hormone secretion (n = 1) and steroid therapy (n = 1), respectively. Of the ten, six had favourable outcomes, two were fatal and outcomes were unclear in the remainder (Table 2). Of the two fatal cases, a diagnosis of strongyloidiasis coinfection in a TB patient was made, and an anti-TB regimen and ivermectin treatment were initiated. However, the patient still expired probably due to a delayed presentation as symptoms had evolved for a 2-month duration [26]. On the other, a diagnosis of TB was confirmed from sputum culture twelve days after the patient’s demise and on autopsy [10].

Table 2 Case reports on Strongyloides stercoralis and Mycobacterium tuberculosis coinfection
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About strongyloidiasis and aspergillosis coinfection, we found 10 individual case reports. Five were reported from the USA (50%), one each from Iran (10%), China (10%), Italy (10%), Colombia (10%) and the Netherlands (10%). The mean age (± standard deviation) was 65.2 (± 13.5) and a range of 36 to 82. Of the ten, eight (80%) were males with a male:female ratio of 4:1. Clinical features were majorly cough (n = 4), dyspnoea (n = 4), fever (n = 3) and shortness of breath (n = 2). Commonly encountered comorbidities identified were asthma (n = 3) and leukaemias (n = 3) and all the cases were on steroid therapy (Table 3). Of the ten cases highlighted, five each had favourable and fatal outcomes. Of the five with fatal outcomes, antihelminth and antifungal therapy declined in one [35], three were linked with steroid therapy [1, 38, 42] and the remainder due to a delayed diagnosis [12].

Table 3 Summary of case reports on the co-occurrence of strongyloidiasis and aspergillosis
Full size table

Discussion

Strongyloidiasis and tuberculosis coinfection

Expectedly, the reported cases and studies on strongyloidiasis coinfection in TB patients were mainly from endemic regions. Cases reported from non-endemic regions were in immigrants from regions endemic for strongyloidiasis [27,28,29]. Our review highlights over 200 cases of strongyloidiasis and TB coinfection reported worldwide with a significant proportion from sub-Saharan Africa [18,19,20,21,22,23,24,25]. Paradoxically, despite the endemicity of strongyloidiasis in South-East Asia and the highly burdened TB countries in that region, sparse cases of strongyloidiasis and TB coinfection were reported [26, 28, 31, 33]. This may be linked with the paucity of studies investigating TB patients for strongyloidiasis or perhaps the underdiagnosis and or underreporting of strongyloidiasis and TB coinfection as revealed in this index review. The epidemiological surveys conducted in this regard were all from Africa and none from Asia which suggests missed cases across the globe. Prioritizing research in this area, especially at a global scale will mitigate these gaps.

Besides strongyloidiasis, Mycobacterium tuberculosis infection is also known to coexist with other intestinal parasites. A pooled prevalence of intestinal parasite coinfection of 33% was documented in a systematic review of studies conducted in Ethiopia with Ascaris lumbricoides (10.5%), Hookworm (9.5%), Giardia lamblia (5.7%) and Strongyloides stercoralis (5.6%) being the most common [43]. From Tanzania, the overall prevalence of helminth coinfections in adult TB patients was 22.9% and predominantly associated with S. stercoralis (42.4%) and S. mansoni (23.8%) [21]. Likewise, a systematic review of pulmonary TB patients from Africa and Asia documented a pooled prevalence of helminth coinfection of 29.69%; Schistosoma mansoni (9.98%) being the highest and followed by S. stercoralis (7.74%) and hookworm (6.91%) respectively [44]. An earlier global systematic review (1984–2012) on the same subject identified 24 cases from 22 studies and a total of 770 cases from five epidemiological surveys [45]. The findings from these review studies suggest a significant proportion of TB patients have intestinal helminth coinfections, thus the routine screening of TB patients for intestinal parasites should be encouraged especially in regions endemic for both clinical conditions as prompt diagnosis and initiation of treatment modalities are vital to attaining favourable outcomes.

Strongyloidiasis and aspergillosis coinfection

Generally, fungal infections are not commonly associated with the immunocompetent unless following activities that cause undue or severe exposure to the conidia of these fungal pathogens or due to prolonged contact with an infected person or via fomites as seen in dermatophytosis [15, 46]. On the other hand, the immunocompromised including individuals with underlying HIV infection, cancer patients, prolonged steroid therapy, patients undergoing organ transplantation, and diabetics, amongst others are frequently susceptible to fungal infections due to impaired immune functions [15]. The latter may account for the coexistence of S. stercoralis and opportunistic fungal pathogens as strongyloidiasis is also known to impair cellular immunity via the modulation of proinflammatory cytokines thereby dampening the basal immune response [7]. Moreover, strongyloidiasis as previously mentioned has an increased risk of lung cavitations which may predispose to aspergilloma formation [8, 47].

Risk factors

Reported cases of strongyloidiasis and TB or aspergillosis coinfections had notable underlying diseases and risk factors including malnutrition, cancers, chronic obstructive pulmonary diseases (COPDs), steroid use, rural residence and contaminated water sources. Malnutrition is an important risk factor for strongyloidiasis and TB as well as is often associated with reduced lymphocyte count and as such increases the risk for strongyloidiasis hyperinfection and TB reactivation [10, 31].

All cases of strongyloidiasis and aspergillosis coinfections highlighted in this review were on steroid therapy due to underlying illnesses including cancers, autoimmune conditions and COPDs. Prolonged use of steroids suppresses immune functions as it impairs T lymphocyte activation, enhances recruitment of T regulatory cells and promotion of M2 macrophage polarization [48], thus predisposing to opportunistic mycoses and or strongyloidiasis hyperinfection. Similarly, the use of steroids in the management of TB worsens strongyloidiasis and can lead to hyperinfection or disseminated disease [31, 32]. Although the underlying mechanisms of these are unclear, postulations by some authors hold that steroids may cause acute suppression of eosinophilia (important mediators of the immune response to S. stercoralis) or a direct effect on parasites by accelerating their transformation from filariform to rhabditiform larvae [32, 49].

The implication of rural residence in strongyloidiasis and TB coinfection may be linked with poor hygiene, overcrowding and the inability to adopt lifestyle changes that would reduce infection risk hence the likelihood of ingesting contaminated food or water which is a route of infection for most intestinal parasites [20]. Contrastingly, some studies reported a high prevalence of helminth and TB coinfection in urban areas but were however linked with poor urban planning and hygiene control [21].

Clinical implications

To begin with, the clinical presentation of strongyloidiasis is non-specific. It could mislead the attending clinician to consider other close mimics [11, 30]. Marchesi et al. reported systemic strongyloidiasis and primary aspergillosis of the gastrointestinal tract in a patient with T-cell acute lymphoblastic leukaemia which was unfortunately fatal due to a confounding clinical picture that suggested other differentials including chemotherapy side effects, neutropenic enterocolitis, drug-related hepatic failure and the concomitant presence of invasive aspergillosis. Diagnosis of strongyloidiasis was confirmed in this index patient at autopsy and invasive aspergillosis as well [12]. In the same vein, strongyloidiasis and TB coinfection may occur in an immunocompromised patient, or either of the two clinical conditions may predispose to an overt manifestation of the other [10, 31, 50]. As described in some case reports, some patients were seen to have developed TB infection after successful treatment for strongyloidiasis [31], and vice versa [27]. Thus, in either case, a diagnosis of TB should be considered or ruled out in a patient with strongyloidiasis hyperinfection and likewise strongyloidiasis in a patient being managed for TB especially when steroid therapy is included as part of the treatment regimen and more so if the index TB patient is presenting with gastrointestinal symptoms [10, 26]. This is pertinent for the attending clinician as a delayed diagnosis of TB in the context of ‘strongyloidiasis and TB coinfection’, and a delayed diagnosis of strongyloidiasis in the setting of ‘strongyloidiasis and aspergillosis coinfection’ accounted for some of the fatalities documented in this review [10, 12].

Diagnosis

Besides mimicking other disease conditions, the diagnosis of strongyloidiasis is quite challenging for several reasons as the diagnostic tools have varied sensitivity and specificity, and as such false negatives or positives may be entertained which may be detrimental to patient care [51]. The common method used for diagnosis is stool microscopy, but this has a sensitivity of 50% attributed to the intermittent shedding of the rhaditiform larva even in a symptomatic patient [26]. Detection of antibodies against Strongyloides has improved sensitivities (74 to 98%) however not specific as cross-reactions can result in false positive results due to other parasitic infestations like filariasis or ascariasis [26]. Peripheral eosinophilia which is a laboratory feature consistent with parasitic diseases has been repeatedly shown in many case reports to be absent and as such not reliable [26, 31, 33]. On the other hand, in some case reports the only marker for strongyloidiasis was eosinophilia [28]. Baermann’s technique has been shown to have the highest sensitivity and thus the most preferred method. In a study conducted in Iran comparing the sensitivity of five parasitological methods including direct smear of faeces in saline and Lugol iodine stain, Baermann technique, formalin-ethyl acetate concentration, Harada-Mori filter paper, agar plate culture and a molecular method, Baermann technique was the most sensitive with 90% positive outcomes while the least positive result was obtained with Harada-Mori method, 3.3% [52]. Howbeit, as the Baermann technique is not widely used and seemingly time-consuming, the deployment of multiple diagnostics would enhance prompt diagnosis and early initiation of antihelminth therapy.

Overview of immunology

The immunology of strongyloidiasis in TB patients is elaborately discussed in the literature with explanations as to why strongyloidiasis impairs the immunity of an individual with TB and vice versa. This is basically because the immune response pathway of both clinical entities counteracts each other; while the immune response to TB is mediated by proinflammatory T-helper type 1 (Th1) and Th17 cells cytokines which play a role in combating bacterial and viral infections, helminth infection contrastingly activates the release of anti-inflammatory Th2 cytokines, increased levels of circulating immunoglobulin E (IgE) antibodies, eosinophils, mast cells, regulatory T cells (Tregs) and transforming growth factor-β (TGF-β) [7]. One study investigating the effect of intestinal helminths on the immune response to PPD in naturally immunized or Bacille Calmette-Guerin (BCG) vaccinated individuals conducted in Ethiopia showed individuals with helminths infection had reduced T cell and PPD skin test responses while improved BCG efficacy following increased T cell proliferation and interferon were associated with antihelminthic therapy [53]. Likewise, some studies have also affirmed the above position stating the inhibitory effect of Th2 cell cytokines on Th1 immune response is reduced with the removal of the helminth following antihelminth therapy [54, 55].

Besides showing helminth infection to regulate cytokine responses in both pulmonary and latent tuberculosis infection, studies have also shown helminth-mediated modulation of the systemic and mycobacterial antigen-stimulated cytokine profiles to occur in individuals with extrapulmonary tuberculosis. A study investigating the association between S. stercoralis coinfection with tuberculous lymphadenitis showed plasma cytokines; specifically Type 2, regulatory and Type 17 cytokines were elevated while proinflammatory cytokines were reduced [56]. Modulation of monocyte responses in helminth-TB coinfection has also been described with a reduced capacity to phagocytose or exhibit respiratory burst activity and less expression of proinflammatory cytokines in S. stercoralis positive individuals compared with S. stercoralis negative individuals [57]. Regarding the immunological interactions between strongyloidiasis and aspergillosis, data was sparse in the literature, and this informs an area that needs to be urgently explored.

Limitations

Clinical outcomes were not documented in a significant number of cases which may have masked the burden of strongyloidiasis and TB coinfection in this review. In addition, we may have missed some studies or case reports relating to this review as the databases searched were limited to Google Scholar and PubMed. Howbeit, the data highlighted in this review was global and captured significant gaps in the management of strongyloidiasis coinfection with TB and aspergillosis with recommendations on how to mitigate these pitfalls.

Conclusion

Strongyloidiasis and TB coinfection are commonly encountered in sub-Saharan Africa and paradoxically less reported in other TB endemic regions probably due to paucity of studies investigating the co-occurrence of strongyloidiasis and TB. The predisposition of individuals with strongyloidiasis to develop TB is linked with the systemic immunomodulation associated with strongyloidiasis disease. On the other hand, besides the increased risk of cavitations, impaired immune status following prolonged steroid therapy was a major driver of strongyloidiasis coinfection in patients with aspergillosis. Further studies are required to decipher the molecular basis underlying the interrelation of aspergillosis and strongyloidiasis.

Availability of data and material

All underlying data have been included in the manuscript.

Abbreviations

TB:

Tuberculosis

HTLV:

Human T-lymphotropic virus

HIV:

Human immunodeficiency virus

AIDS:

Acquired immune deficiency syndrome

WHO:

World Health Organization

MeSH:

Medical subject headings

COPDs:

Chronic obstructive pulmonary diseases

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Authors and Affiliations

  1. Department of Medical Microbiology and Parasitology, University of Calabar Teaching Hospital, Calabar, Nigeria

    Christian J. Ide, Ikechukwu Okekemba, Promise Owai & Bassey E. Ekeng

  2. Department of Internal Medicine, University of Calabar Teaching Hospital, Calabar, Nigeria

    David E. Elem, Thelma E. Bassey & Walter E. Odok

  3. Department of Haematology and Blood Transfusion, University of Calabar Teaching Hospital, Calabar, Nigeria

    Ofonime E. Benjamin

  4. Department of Family Medicine, University of Calabar Teaching Hospital, Calabar, Nigeria

    Geraldine L. Edim

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  1. Christian J. Ide
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Contributions

Christian J. Ide: methodology, formal analysis, visualization, resources, writing—review and editing; David E. Elem: methodology, investigation, visualization, resources, writing—review and editing; Thelma E. Bassey: data curation, investigation, visualization, resources, writing—review and editing; Ofonime E. Benjamin: data curation, investigation, methodology, resources, writing—review and editing; Ikechukwu Okekemba: investigation, formal analysis, visualization, resources, writing—review and editing; Walter E. Odok: methodology, investigation, visualization, resources, writing—review and editing; Promise Owai: data curation, investigation, methodology, resources, writing—review and editing; Geraldine L. Edim: investigation, formal analysis, project administration, visualization, resources, writing—review and editing; Bassey E. Ekeng: conceptualization, writing—original draft, data curation, formal analysis, investigation, methodology, project administration, resources, validation, visualization, writing, review and editing, supervision and resources.

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Correspondence to Bassey E. Ekeng.

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Ide, C.J., Elem, D.E., Bassey, T.E. et al. Strongyloidiasis co-occurrence with tuberculosis and aspergillosis in immunocompromised patients: a global scoping review. Egypt J Intern Med 36, 87 (2024). https://doi.org/10.1186/s43162-024-00354-0

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