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Experimental and Therapeutic Medicine logoLink to Experimental and Therapeutic Medicine
. 2019 Nov 7;19(1):160–164. doi: 10.3892/etm.2019.8172

Concurrent infection with Talaromyces marneffei and Cryptococcus neoformans in a patient without HIV infection

Susu He 1, Dongqing Lv 1, Youzu Xu 1, Xiaomai Wu 1, Ling Lin 1,
PMCID: PMC6909663  PMID: 31853286

Abstract

A case report of coinfection with Talaromyces marneffei (T. marneffei) and Cryptococcus neoformans (C. neoformans) is presented in a 57-year-old woman with hemolytic anemia who received dexamethasone for 8 years. To the best of our knowledge, this patient was successfully treated with voriconazole. This is the first case of T. marneffei and C. neoformans coinfection in a HIV-negative host. Clinicians should be aware of concomitant infection with T. marneffei and other pathogens in immunocompromised hosts. The current case report highlights the importance of clinician awareness of concurrent infections with T. marneffei and other pathogens in immunosuppressed patients.

Keywords: talaromyces marneffei, Cryptococcus neoformans, immunosuppression, antifungal therapy, coinfection

Introduction

Talaromyces marneffei (T. marneffei) is a rare pathogenic Talaromyces species in humans and is the only temperature-dependent dimorphic fungus of the Talaromyces genus. In 1973, DiSalvo et al (1) reported the first case of a natural T. marneffei infection in humans. Currently, T. marneffei infection is a common opportunistic infection in patients with HIV and is prevalent in South Asian countries and South China (27). In the past two decades, the incidence of Talaromyces spp. infection has risen dramatically in tandem with the HIV epidemic. T. marneffei infections generally occur in patients with late-stage acquired immune deficiency syndrome (AIDS) or immunodeficiency (2). Therefore, Talaromyces spp. infection is more likely to occur concurrently with other opportunistic infections (79). The simultaneous identification of T. marneffei and Cryptococcus neoformans (C. neoformans) from blood and bronchial mucosal biopsy cultures is uncommon, and very few cases have been reported to date (7). The diagnosis and treatment of concurrent infection with T. marneffei and C. neoformans is challenging in the clinical setting (7). In the current case report, a concurrent infection with T. marneffei and C. neoformans (based on blood and bronchial mucosal biopsy cultures) is presented in a Chinese patient without HIV infection, which was successfully treated. A literature review was performed to provide new insight into the treatment of this rare concurrent infection.

Case report

In January 2017, a 57-year-old Chinese woman presented with a fever (maximum temperature, 39°C), cough (coughing a moderate quantity of white sputum) and pharyngalgia, which began two days prior to hospital admission (12th January 2017; Taizhou Hospital of Wenzhou Medical University, China). The patient was diagnosed with hemolytic anemia 8 years prior to admission, and treated with dexamethasone 9 mg/d, which was gradually reduced to 2.25 mg/d after symptoms improved. The patient was still taking dexamethasone at the time of admission. However, the patient could not provide any other details about Dexamethasone treatment. The patient had no recent or direct contact with specific plants including rotten sugar canes or animals such as bamboo rats and had not traveled to any endemic areas such as South Asian countries and South China. The CT scan performed at Xianju County People's Hospital (China) revealed the presence of a hyperdense mass in the right lower lung (Fig. 1). The patient was subsequently treated with antibiotics but exhibited a poor response.

Figure 1.

Figure 1.

Pulmonary CT scan revealed a hyperdense mass (as indicated by the arrow) in the right lower lung, with unclear boundaries and non-uniform density.

The patient was then referred to Taizhou Hospital of Wenzhou Medical University, China on 12th January 2017 with a body temperature of 37.3°C, which increased thereafter, a pulse rate of 115 beats/min, a respiratory rate of 17 breaths/min, a blood pressure of 107/94 mmHg and an oxygen saturation of 99%. A physical examination was performed upon admission and demonstrated palpable lymph nodes that were 1–3 cm in size, and tenderness over the left cervical and supraclavicular areas. On the second day of hospital admission, laboratory tests using whole blood specimen (BC-6800 plus; Mindray Medical International Limited) at 25°C for 1 min revealed a white blood cell count of 3,300 cells/ml (normal range, 4.0–10×109 cells/l), neutrophils 93.3% (normal range, 40–75%), lymphocytecount 200 cells/ml (normal range, 1.1–3.2×109 cells/l), hemoglobin 61 g/dl (normal range, 115–150 g/l) and platelet count 22,000 cells/ml (normal ranges: 125–350×109 cells/l). C-reactive protein level (CRP-M100; Mindray Medical International Limited) was 311 mg/dl (normal range, <5.0 mg/l) using whole blood specimen at 25°C for 2 min and a negative result for HIV antibodies (Microelisa Stripplate; Bejing Wantai Biological) using serum at 37°C for 120 min was determined. Serum chemistry (Beckman AU5800) using serum at 37°C for 40 min revealed that alanine transaminases was 22 U/l (normal range: 7–40 U/l) and aspartate transaminases was 32 U/l (normal range: 13–35 U/l), these levels were normal. A type-B ultrasound examination revealed left cervical, left supraclavicular, bilateral inguinal and retroperitoneal lymphadenopathy. Since the chest CT scan failed to reveal any enlarged pulmonary hilar or mediastinal lymph nodes, the patient did not undergo an endobronchial ultrasound bronchoscopy.

The patient was treated with Ceftazidime (2.0 g intravenous infusion per 12 h) and Levofloxacin (0.5 g iv infusion once a day) on the day of admission. On day 5 of treatment, hyperpyrexia occurred again similar to two days before admission and blood cultures were subsequently performed. Endoscopic esophageal ultrasound-guided fine-needle aspiration of the left supraclavicular lymph nodes was performed and the aspirates were submitted for histopathology. Blood cultures grew T. marneffei after 5 days of incubation at 25°C, and the aspirate from a supraclavicular lymph node stained with Gomeri methenamine silver (25°C constant temperature water bath for 50 min) revealed yeast-like fungi with transverse septa, which confirmed the presence of T. marneffei (Fig. 2). Subsequently, on hospital day 11, treatment with intravenous voriconazole (6 mg/kg per 12 h for the first 24 h, followed by 4 mg/kg per 12 h) began. The fever subsided after 4 days of treatment, and the patients' cough and pharyngalgia also improved. The patient was treated with intravenous voriconazole for 2 weeks, and received oral voriconazole therapy of 200 mg twice a day. Blood cultures were performed on hospital admission day 23 for the detection of T. marneffei. Blood cultures on day 5 did not exhibit T. marneffei growth, but did exhibit C. neoformans. Antimicrobial susceptibility testing of C. neoformans using the broth dilution method (10) (bioMerieux, Ltd.) was conducted and the rank order of potency, which was based on minimum inhibitory concentration (MIC) values, were itraconazole (0.06), voriconazole (0.125), amphotericin B (0.5), fluconazole (1) and 5-fluorocytosine (4). A period of 2 weeks into treatment with oral voriconazole, the patient underwent a CT scan of the chest on hospital day 37, which revealed deterioration compared with the previous scans (Fig. 3). On the same day, a bronchoscopy was performed, which revealed hyperplasia and edema of the airway mucosa of the right lower lobe bronchus (Fig. 4). Although the patient's symptoms had been significantly relieved, on day 38, the patient was treated with intravenous voriconazole of 4 mg/kg per 12 h for 10 additional days based on the chest CT scan and bronchoscopy results. A period of 3 days later, the periodic acid-Schiff-stained (25°C; 15 min) preparation of bronchial mucosal mesenchyme confirmed the presence of C. neoformans (Fig. 5). The patient achieved dramatic clinical improvement and was discharged home on oral voriconazole (200 mg twice a day) for a period of 2 months. At the 2 month follow up following the completion of therapy, there was no evidence of ongoing infection and a repeat CT scan of the chest revealed significant improvement in the right lower lung lesion (Fig. 6).

Figure 2.

Figure 2.

Sausage-like bacteria indicated by methenamine silver staining of the supraclavicular lymph nodes with septa. Talaromyces marneffei infection was indicated. The arrow indicates the septa. Magnification, ×400.

Figure 3.

Figure 3.

Solid lesion combined with cavitation (as indicated by the arrow) in the right lower lung by pulmonary CT.

Figure 4.

Figure 4.

Bronchial mucosal edema and hyperplasia (as indicated by the arrow) indicated via bronchoscopy.

Figure 5.

Figure 5.

Cryptococcus neoformans spores (as indicated by the arrow) in bronchial mucosal mesenchyme indicated viaperiodic acid-Schiff staining. Magnification, ×400.

Figure 6.

Figure 6.

A follow-up chest CT scan revealed that the pulmonary lesion was absorbed (as indicated by the arrow) after the patient had been taking voriconazole tablets of 200 mg twice a day for 2 months.

Discussion

T. marneffei causes a disseminated and lethal fungal disease, which is known as talaromycosis. In South Asian countries, talaromycosis has become the third most common disease in patients infected with HIV, following tuberculosis and cryptococcosis (25). Talaromycosis is becoming increasingly prevalent in patients who are HIV-negative and exhibit no apparent risk factors or underlying immunodeficiency, including organ transplant recipients, patients with hematologic malignancies or patients receiving glucocorticoids or immunosuppressants (1,5,1114). The majority of T. marneffei infections occur in patients with AIDS or an immunodeficiency disorder, whose CD4+ T cell count is typically <100 cell/pl (15). Within these patients, concurrent cryptococcosis, tuberculosis, Pneumocystis jirovecii pneumonia or concurrent cytomegalovirus and salmonella infections, are common (69). However, concurrent infection with T. marneffei and C. neoformans are rarely reported. In the current case report, the literature was reviewed and 8 cases of concurrent infection with T. marneffei and C. neoformans were presented in patients who were HIV-positive (7). To the best of our knowledge, this is the first case report describing a patient with concurrent infection with T. marneffei and C. neoformans who was also HIV-negative. The two types of fungi were simultaneously identified from blood culture (T. marneffei and C. neoformans) and bronchial mucosal biopsy cultures (C. neoformans).

Immunodeficiency represents a major risk factor for T. marneffei infection (5). Ma et al (16) impaired the immune state of monocytes via the addition of dexamethasone and declared that immunosuppressants, including dexamethasone, exhibit inhibitory effects on monocytes and macrophages, and can increase patient susceptibility to T. marneffei infection. CD4+ T cell-induced immunodeficiency may also serve a pathogenic role in HIV-negative patients with immunodeficiency (2,13,17). A number of reports have indicated that anti-cytokine and anti-interferon-γ autoantibodies are associated with adult-onset immunodeficiency (1,14,17,18). These results indicated another possible reason for cellular immunodeficiency in patients who are HIV-negative, which contributes to host susceptibility to T. marneffei infection. The patient presented in the current case study received long-term glucocorticoid treatment (oral dexamethasone) for erythroblastic anemia for 8 years. The resulting decrease in white blood cell count further led to immunosuppression and T-cell immunodeficiency. Therefore, the patient exhibited an increased susceptibility to opportunistic infections. Unfortunately, the detection techniques were not available in the hospital this patient was admitted to, so these autoantibodies (including anti-cytokine and anti-interferon-γ autoantibodies) were not detected, which is a limitation of the current case study.

Talaromycosis is associated with non-specific manifestations, including fever, weight loss, systemic lymph node enlargement, hepatosplenomegaly, skin lesions and anemia (4,19). Evidence has indicated that symptoms of T. marneffei infection in patients who are HIV-negative differ from those in patients who are HIV-positive due to the disparities in the causes and features of immunosuppression (5,15). The patient of the current case study presented with fever, cough, lymph node enlargement, anemia and thrombocytopenia, all of which were non-specific, and may lead to a misdiagnosis of tuberculosis or other fungal infections. The clinical implication of a misdiagnosis is that fungal infections are likely in patients with persistent fever following routine antibacterial therapy, with long-term glucocorticoid treatment or with an immunodeficiency disorder, and in these patients, concurrent opportunistic infections should be considered. Clinically, T. marneffei infection shares similar manifestations with tuberculosis or infections that are caused by C. neoformans, Histoplasma capsulatum and Nocadias. Concurrent infections with two or more pathogens should therefore be considered and confirmed by further tests. Furthermore, rare forms of these diseases deserve additional attention. The diagnosis and treatment of disseminated T. marneffei is difficult due to the existence of mixed infections, particularly in patients with concurrent fungal infections. Kawila et al (5) reported that T. marneffei infection-associated mortality in patients who were HIV-negative was unexpectedly higher than that inpatients infected with HIV. This result may be due to the fact that T. marneffei infection develops more quickly and a skin rash usually appears in patients who are HIV-positive, which makes diagnosis easier. In contrast, the symptoms of T. marneffei infection are more complex and more likely to be confused with other conditions in patients without HIV infection. Furthermore, mixed infections are common in patients without HIV infection, which contributes to a higher mortality (16). The patients presented in the current case study received intravenous voriconazole immediately following the diagnosis of T. marneffei infection. The symptoms of fever, cough, pharyngalgia and hemoptysis were improved gradually following treatment. The patient was changed to oral therapy 14 days after the treatment began. Blood cultures taken on day 5 indicated no T. marneffei growth, but indicated the growth of C. neoformans. These results demonstrated that the treatment was effective for T. marneffei infection, but unfortunately, it was undetermined as to whether C. neoformans infection occurred before or after the patient started receiving voriconazole. This was due to the fact no assessment of C. neoformans antigens or bronchoscopy was performed at the early stage of the disease and the repeat chest CT scan was not performed early enough. C. neoformans was simultaneously identified from serial blood cultures and confirmed using bronchial mucosal biopsy. The C. neoformans infection in the patient of the case study was sensitive to voriconazole, which was used to treat the T. marneffei infection, making it easier to effectively treat the patient and preventing the condition from becoming life threatening. The valuable clinical information demonstrated from the present case study is that the symptoms induced by the two pathogens in a concurrent infection may be similar. If a patient responds poorly to initial monotherapy, the possibility of coinfection should be considered. When coinfection occurs, it is necessary to determine if initial therapy is effective for treating all concurrent infections. If not, new treatment options should be considered. The patient of the current report did not exhibit any symptoms of central nervous system disorders and refused to receive a lumbar puncture. Due to this, whether the patient had C. neoformans meningitis could not be determined and this is a limitation of the current case report.

No standard antifungal treatment for T. Marneffei infection has been established and currently certain studies (20,21) have identified that amphotericin B liposomal was effective in the treatment of T. Marneffei infection and recommended as initial therapy for the disease. However, amphotericin B's common side effects include electrolyte disturbance, renal compromise and hepatic impairment, which limits its clinical use (22). Voriconazole is an antifungal medication. It is in the triazole family of medications. Voriconazole has been revealed to exhibit potent in vitro activity and is used to treat multiple aggressive fungal infections with adequate safety and efficacy profiles (23). A recent retrospective study indicated that the intravenous administration of voriconazole as initial therapy for T. Marneffei infection was effective and well tolerated (24). The continuous administration of voriconazole for 12 weeks was demonstrated to be effective for the treatment of T. marneffei infection in patients with advanced HIV disease (25). However, no recommendation has been published on the duration of voriconazole administration for the treatment of disseminated T. marneffei infection in patients who are HIV-negative. A previous retrospective study indicated that the duration of therapy for T. marneffei infection was prolonged in patients who are HIV-negative compared with the treatment duration in patients who are HIV-positive (5). Voriconazole was used instead of amphotericin B for the current case report, following the confirmation of T. marneffei infection as Voriconazole has fewer side effects, is cheaper, was readily available at the hospital of admittance, is easier to purchase and has been determined to be effective in the treatment for talaromycosis (22,24). A number of studies have indicated that C. neoformans was sensitive to voriconazole treatment (26,27) and that its MIC value was low, indicating that voriconazole may be appropriate for the treatment of C. neoformans infection. Therefore, the patient continued to receive voriconazole following the confirmation of C. neoformans infection. Symptoms subsequently improved and the pulmonary lesion almost disappeared following treatment. For T. marneffei infection in patients who are HIV-negative, further studies are required to understand the duration that voriconazole should be administered, particularly in cases of concurrent fungal infections. The current case report should serve to indicate the importance of monitoring the condition of patients closely, to determine the most appropriate treatment duration of voriconazole. If no improvement is observed despite treatment at a dosage determined via drug susceptibility testing, prolonging initial treatment may be the most appropriate option.

In conclusion, the current case study indicated that despite being rare, concurrent septicemia and bronchopulmonary infection caused by T. marneffei and C. neoformans can occur. The risk of concurrent infection with T. marneffei and C. neoformans is higher in patients with a severely compromised immune system. When coinfection occurs, one pathogen may outgrow the other in blood cultures, masking the presence of the other therefore the diagnosis and treatment of concurrent infections with T. marneffei and C. neoformans are difficult. Clinicians should therefore be fully aware of the possibility of concurrent infections with T. marneffei and other opportunistic pathogens. For immunosuppressed patients, early diagnosis and treatment are crucial for improving patient prognosis. Further studies are warranted to better understand why an increasing number of patients who are HIV-negative are infected with T. marneffei or other opportunistic pathogens.

Acknowledgements

Not applicable.

Funding

Funding was received from The Science and Technology Foundation of Taizhou (grant no. 1801KY18) and the Projects of Medical and Health Technology Program in Zhejiang Province (grant no. 2015KYB439).

Availability of data and materials

The datasets used and/or analyzed during the present study are available from the corresponding author on reasonable request.

Authors' contributions

SH and XW conceived and designed the review. DL and YX prepared the patient data and figures. LL analyzed and interpreted the data. All authors agree to be accountable for all aspects of the research in ensuring that the accuracy or integrity of any part of the work are appropriately investigated and resolved. All authors read and approved the final manuscript.

Ethics approval and consent to participate

The Ethics Committee of Taizhou Hospital of Wenzhou Medical University passed the ethical review (approval nο: K20190214). The Ethics Committee of Taizhou Hospital of Wenzhou Medical University waived the need for consent for the publication of patient information in the present manuscript due to the reason that the patient had passed away.

Patient consent for publication

Due to the death of the patient, no consent for publication was gained.

Competing interests

The authors declare that they have no competing interests.

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Associated Data

This section collects any data citations, data availability statements, or supplementary materials included in this article.

Data Availability Statement

The datasets used and/or analyzed during the present study are available from the corresponding author on reasonable request.


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