A Case of Disseminated Mycobacterium Haemophilum in a Kidney Transplant Recipient Presenting With Subcutaneous Nodules.

INTRODUCTION: Dermatologic manifestations of diseases in solid organ transplant recipients are common due to long-term immunosuppression. CASE PRESENTATION: We present the case of a 63-year-old man with a kidney transplant who exhibited subcutaneous nodules on lower extremities, cytopenia, and asymptomatic pulmonary infiltrate. Through a skin biopsy and 16S ribosomal RNA (rRNA) sequencing, Mycobacterium haemophilum was identified. His clinical course was complicated by empyema, septic arthritis, and recurrence of his skin manifestations, despite ongoing antimicrobial treatment. DISCUSSION: This case emphasizes the challenges and potential complications associated with M haemophilum infections in solid organ transplant recipients receiving long-term immunosuppressive therapy. It highlights the importance of employing advanced diagnostic techniques when evaluating dermatologic manifestations in these patients. The patient's complex clinical course also underscores the difficulties involved in effectively addressing and managing complications that may arise even after initiating therapy.

Antiretroviral therapy-induced paradoxical worsening of previously healed Mycobacterium haemophilum cutaneous lesions in advanced HIV infection.

Mycobacterium haemophilum is a nontuberculous mycobacterium that causes localized or disseminated disease, mainly in immunocompromised hosts. We report the case of a 35-year-old HIV-infected woman who presented with several enlarging cutaneous lesions over the arms and legs. Histopathological examination revealed the diagnosis of a cutaneous mycobacterial disease. Mycobacterial analyses unveiled M. haemophilum infection. Six months after completion of a successful antimycobacterial treatment, she developed an immune reconstitution inflammatory syndrome (IRIS). This paradoxical relapse presented as tenderness, redness and swelling at the precise sites of the healed lesions and took place in the setting of significant recovery of the CD4 cell count (from 05 to 318 cells/mm 3 ). Microbiological analyses of these worsening lesions were negative, and they spontaneously remitted without the initiation of a novel antimycobacterial treatment cycle. M. haemophilum infection should always be considered as a cause of skin lesions in immunocompromised subjects. Physicians should be aware of the possibility of IRIS as a complication of successful antiretroviral therapy in HIV-infected patients with M. haemophilum infection.

Cluster of Lymphadenitis due to Nontuberculous Mycobacterium in Children and Adolescents 8-15 Years of Age.

BACKGROUND: Nontuberculous mycobacteria (NTM) lymphadenitis is an under-recognized entity, and data of the true burden in children are limited. Without a high index of suspicion, diagnosis may be delayed and microbiological detection is challenging. Here, we report a cluster of NTM lymphadenitis experienced in Korean children. METHODS: Subjects under 19 years of age diagnosed with NTM lymphadenitis during November 2016-April 2017 and April 2018 were included. Electronic medical records were reviewed for clinical, laboratory and pathological findings. Information regarding underlying health conditions and environmental exposure factors was obtained through interview and questionnaires. RESULTS: A total of ten subjects were diagnosed during 18 months. All subjects were 8-15 years of age, previously healthy, male and had unilateral, nontender, cervicofacial lymphadenitis for more than 3 weeks with no significant systemic symptoms and no response to empirical antibiotics. Lymph nodes involved were submandibular (n = 8), preauricular (n = 6) and submental (n = 1). Five patients had two infected nodes and violaceous discoloration was seen in seven subjects. Biopsy specimens revealed chronic granulomatous inflammation and acid-fast bacteria culture identified Mycobacterium haemophilum in two cases and NTM polymerase chain reaction was positive in two cases. Survey revealed various common exposure sources. CONCLUSION: NTM lymphadenitis is rare but increasing in detection and it may occur in children and adolescents. Diagnosis requires high index of suspicion and communication between clinicians and the laboratory is essential for identification of NTM.

Cutaneous Mycobacterium haemophilum infection involving the upper extremities: diagnosis and management guidelines.

Mycobacterium haemophilum is a nontuberculous organism that commonly manifests as cutaneous lesions and subcutaneous nodules in immunosuppressed adults. Because M haemophilum infection is rare, the epidemiology, reservoir, and mode of transmission remain largely unknown. Infection presents a challenge to the dermatology community because it is infrequently suspected and commonly misidentified, resulting in delayed diagnosis. We discuss 3 cases of cutaneous M haemophilum infection to better understand clinical presentation, diagnosis, and management.

Clinical Characteristics and Treatment Outcomes for Patients Infected with Mycobacterium haemophilum.

Mycobacterium haemophilum is a nontuberculous mycobacterium that can infect immunocompromised patients. Because of special conditions required for its culture, this bacterium is rarely reported and there are scarce data for long-term outcomes. We conducted a retrospective study at Siriraj Hospital, Bangkok, Thailand, during January 2012-September 2017. We studied 21 patients for which HIV infection was the most common concurrent condition. The most common organ involvement was skin and soft tissue (60%). Combination therapy with macrolides and fluoroquinolones resulted in a 60% cure rate for cutaneous infection; adding rifampin as a third drug for more severe cases resulted in modest (66%) cure rate. Efficacy of medical therapy in cutaneous, musculoskeletal, and ocular diseases was 80%, 50%, and 50%, respectively. All patients with central nervous system involvement showed treatment failures. Infections with M. haemophilum in HIV-infected patients were more likely to have central nervous system involvement and tended to have disseminated infections and less favorable outcomes.

Case of Mycobacterium haemophilum misdiagnosed as Mycobacterium intracellulare due to one base insertion in the bacterial genome.

Mycobacterium haemophilum is a slow-growing, non-tuberculous mycobacteria that causes cutaneous infection. We describe a case of cutaneous infection in a 68-year-old Japanese man with polymyositis. This was caused by M. haemophilum harboring one base insertion in gene sequence. At first, the causal microorganism was misidentified as M. intracellulare by COBAS® TaqMan® MAI test. However, poor growth on Ogawa media and growth enhancement on 7H11C agar around a hemin-containing disk prompted us to reinvestigate the causal microorganisms, which were revealed to be M. haemophilum. Amplified polymerase chain reaction products were sequenced, and the 16S rRNA gene, rpoB, hsp65 and internal transcribed spacer region sequences showed a 100%, 100%, 99.66% and 99.7% match, respectively, with the corresponding regions of M. haemophilum, but it harbored a novel gene sequence in hsp65. The sequences determined by gene analysis of the M. haemophilum strain were deposited into the International Nucleotide Sequence Database. Although numerous cases of M. haemophilum infection have been reported in other countries, only six cases have been reported in Japan to date. It could be possible that this novel mutation lead to misdiagnosis. As M. haemophilum prefers a lower growth temperature (30-32°C) and it requires iron in the culture medium, M. haemophilum could be misidentified or overlooked. Accordingly, a M. haemophilum infection should be considered in cases of cutaneous infection of the body sites, of which surface temperature is low.

[A toddler with a red swelling in the neck]. / Een kleuter met een rode zwelling in de hals.

BACKGROUND: The differential diagnosis in a child with a swelling in the neck is broad. Chronic lymphadenopathy in children quite often leads to extensive blood tests. Cervicofacial non-tuberculous mycobacterial (NTM) lymphadenitis is, however, not revealed by blood tests. It is a rare condition, which is mostly seen in young children. CASE DESCRIPTION: A 4-year-old girl had a 9-week history of a swelling in her neck; the skin covering the swelling had been red and flaking for the past week. Extensive blood tests did not provide a firm diagnosis and ultrasound revealed 3 heterogeneous abscessing lymph glands with fistulas to the subcutaneous layer, leading to a probable diagnosis of cervicofacial NTM lymphadenitis. The infected lymph node package was excised, and microbiological culture was positive for Mycobacterium haemophilum. CONCLUSION: NTM infections in young children are persistent infections that should be treated surgically at an early stage for the best cosmetic and functional result.

Successful management of Mycobacterium haemophilum lower extremity cutaneous infection in a matched-unrelated donor stem cell transplant recipient.

Nontuberculous mycobacterial infections can often occur in individuals with adequate immune function. Such infections typically have cutaneous involvement and are caused by rapidly growing mycobacterium. Other nontuberculous mycobacteria species, like Mycobacterium haemophilum, almost always present as opportunistic infections occurring in severely immunocompromised hosts. Here, we present a complicated and protracted course of diagnosing M. haemophilum lower extremity cutaneous infection in a matched-unrelated donor stem cell transplant recipient.

Disseminated Mycobacterium haemophilum infection in a renal transplant recipient.

Opportunistic infections are a major concern in renal and transplant medicine. We present the case of a renal transplant recipient with a generalised Mycobacterium haemophilum infection after an increase in immunosuppressive therapy and treatment with a tumour necrosis factor-α (TNF-α) inhibitor. Infection involved skin and soft tissue, joints and bones, as well as the renal transplant with an interstitial nephritis. Rapid diagnosis using PCR and DNA sequencing allowed early appropriate treatment. Triple antibiotic therapy and reduction in immunosuppression resulted in a slow but sustained recovery. Immunosuppression causes severe opportunistic infections. TNF-α inhibitors are very effective and well tolerated but have an increased susceptibility to infections with mycobacteria. Mycobacterial infections represent a significant clinical risk to transplant recipients because of their aggressive clinical course and the need for complex toxic antibiotic treatments. In these patients, M. haemophilum is a cause of skin infections.

Mycobacterium haemophilum infection in a juvenile leatherback sea turtle (Dermochelys coriacea).

Mycobacteriosis is infrequently reported in free-ranging sea turtles. Nontuberculous Mycobacterium haemophilum was identified as the causative agent of disseminated mycobacteriosis in a juvenile leatherback turtle (Dermochelys coriacea) that was found stranded on the Atlantic coast of Florida. Disseminated granulomatous inflammation was identified histologically, most notably affecting the nervous system. Identification of mycobacterial infection was based on cytologic, molecular, histologic, and microbiologic methods. Among stranded sea turtles received for diagnostic evaluation from the Atlantic and Gulf of Mexico coasts of the United States between 2004 and 2015, the diagnosis of mycobacteriosis was overrepresented in stranded oceanic-phase juveniles compared with larger size classes, which suggests potential differences in susceptibility or exposure among different life phases in this region. We describe M. haemophilum in a sea turtle, which contributes to the knowledge of diseases of small juvenile sea turtles, an especially cryptic life phase of the leatherback turtle.

Three-Dimensional Screen: A Comprehensive Approach to the Health Monitoring of Zebrafish.

Considering the numbers of zebrafish held in the laboratories, it is relevant to develop some tools to monitor the health of the animals, as well as their biotope. Environmental samples can be used to detect aquatic pathogens. Comprehensive health monitoring would thus seek pathogens in three dimensions of the animals and microbes' habitat: the fish, the sludge, and the water. This three-dimensional approach is called the 3D screen and it introduces some complementary tools to routine sentinel screening. For example, sludge and sump swabs analyses allow an efficient detection of pathogens at a low cost and with a fast turnover. These assays are particularly useful in cases of Pseudocapillaria tomentosa infestation or Mycobacterium haemophilum outbreak. Indeed, such a broader choice of diagnostic tests gives flexibility for the veterinarian to investigate Mycobacterium spp. presence in the water systems and fish colonies. Some other robust additional analysis, like the mortality rate monitoring, quickens the decision-making process. The 3D screen describes how this new toolbox can be used efficiently to monitor laboratory fish health.

Facial Skin Lesions in Children Caused by Nontuberculous Mycobacteria.

BACKGROUND: Nontuberculous mycobacteria rarely cause facial skin lesions in immunocompetent children. AIM: I describe the clinical features and treatment of nontuberculous mycobacteria facial lesions. MATERIALS AND METHODS: The diagnosis of a facial nontuberculous mycobacteria infection was established using polymerase chain reaction. RESULTS: Of 286 children with confirmed nontuberculous mycobacteria infection, 14 (4.9%; median age 50 mos, range 9-156 mos; 5 [36%] male, 9 [64%] female) had nontuberculous mycobacteria facial skin lesions. Six (43%) had lesions on the cheek and five (36%) in the medial eye corner. Polymerase chain reaction results confirmed the presence of Mycobacterium haemophilum in eight patients (57%) and Mycobacterium avium in six patients (43%). The facial lesions were treated using a combination of clarithromycin and rifabutin for 12 weeks, with a median healing time of 4 months. CONCLUSION: Nontuberculous mycobacteria facial lesions are rare in immunocompetent children. The diagnosis requires a high index of suspicion. Nonsurgical treatment is preferable, because surgical excision of the cutaneous lesions might lead to undesirable visible facial scars.

Mycobacterium haemophilum infection with prominent facial manifestation mimicking leprosy.

Mycobacterium haemophilum is a slow-growing non-tuberculous mycobacterium that is rarely known to cause human skin infection, particularly in immunocompromised patients. We recently experienced a 69-year-old Japanese woman with this infection who had been under immunosuppressive treatment for recalcitrant rheumatoid arthritis. The patient showed disseminated erythematous plaques and subcutaneous nodules on the face and extremities, and interestingly, the face manifested with a striking "facies leontina" appearance. Biopsy revealed abscess and granulomatous dermatitis with the involvement of peripheral nerve bundles and the presence of innumerable acid-fast bacilli, thus necessitating differentiation from lepromatous leprosy. M. haemophilum was identified by molecular characterization as well as by successful culture with iron supplements. Although drug susceptibility testing indicated responsiveness to multiple antibiotics administrated simultaneously for the treatment, it took over 6 months to achieve significant improvement, and we also employed concurrent oral potassium iodide administration and repeated surgical excision. This case highlights the importance of continuous combination therapy for successful outcome in this rare infection. Furthermore, application of potassium iodide for mycobacterial infection warrants further evaluation by accumulating more cases.