Características clínicas e epidemiológicas de casos de infecção pulmonar por Mycobacterium kansasii no Rio de Janeiro, no período de 2006 a 2016 / Clinical and epidemiological characteristics of M. kansasii pulmonary infections from Rio de Janeiro, Brazil, between 2006 and 2016

RESUMO Objetivo Avaliar características clínicas, tomográficas e microbiológicas dos pacientes com doença pulmonar causada pela M. kansasii (DPMK) atendidos em unidade ambulatorial no período 2006-2016. Métodos Estudo descritivo, em que foram analisados 38 pacientes. Foram analisadas as características demográficas, clínico-radiológicas, laboratoriais e terapêuticas. Resultados A média de idade foi 64 anos (DP=10,6; IIQ=57-72; mediana=65,0) e 22 (57,9%) eram pacientes do sexo masculino. Comorbidade pulmonar estava presente em 89,5%. A comorbidade mais frequente foi a bronquiectasia (78,9%). Tratamento anterior para tuberculose pulmonar (TBP) foi relatado em 65,9%. O esquema terapêutico mais utilizado foi rifampicina, isoniazida e etambutol (44,7%). A tomografia de tórax (TCT) mostrou bronquiectasia (94,1%), distorção arquitetural (76,5%), espessamento de septo (67,6%) e cavidades (64,7%). A doença foi bilateral em 85,2%. Houve 10,7% de resistência à rifampicina, 67,9% resistentes ao etambutol e sensibilidade à claritromicina. Conclusão Em pacientes com doença pulmonar estrutural, é importante a busca de DPMNT, principal diagnóstico diferencial com TBP. TC de tórax demonstra diferentes padrões que se sobrepõem ao de doença estrutural causada por TBP ou outras enfermidades pulmonares. Destaca-se a resistência ao etambutol, fármaco componente do esquema preconizado.

ABSTRACT Objective To evaluate clinical, tomographic, and microbiological characteristics of pulmonary disease caused by M. kansasii (MKPD) in patients treated at an outpatient unit from 2006-2016. Methods We studied thirty eight patients, and analyzed socio-demographic, clinical-radiological, laboratory, and therapeutic characteristics. Results The mean age was 64 years (SD = 10.6; IIQ = 57-72; median = 65.0), and 22 (57.9%) male patients. Pulmonary comorbidity was present in 89.5% of the patients. The most frequent comorbidity was bronchiectasis (78.9%). Previous treatment for pulmonary tuberculosis (PTB) was found in 65.9%. The most used therapeutic regimen was rifampicin, isoniazid and ethambutol (44.7%). Chest tomography (CT) showed bronchiectasis (94.1%), architectural distortion (76.5%), septum thickening (67.6%), and cavities (64.7%). Disease was bilateral in 85.2%. We observed 10.7% resistance to rifampicin, 67.9% resistance to ethambutol, and sensitivity to clarithromycin. Conclusion In patients with structural lung disease, it is important to search for NTM, the main differential diagnosis with PTB. Chest CT showed different patterns that overlapped with structural disease caused by PTB or other lung diseases. We observed resistance to ethambutol, a drug component of the recommended regimen.

Chemical composition and in vitro antibacterial activity of essential oils from Murraya paniculata (L. ) Jack (Rutaceae) ripe and unripe fruits against bacterial genera Mycobacterium and Streptococcus

This study aims to investigate chemical composition of essential oils from Murraya paniculata (L.) Jack (Rutaceae) ripe and unripe fruits and determine their in vitro antibacterial activity. Essential oils were extracted by hydrodistillation from Murraya paniculata (L.) Jack ripe and unripe fruits collected in the Cerrado, in Rio Verde, southwestern Goiás, Brazil. They were analyzed by gas chromatography with flame ionization detector (GC-FID) and by gas chromatography-mass spectrometry (GC-MS). Sesquiterpenes, which represent the most abundant class of compounds in oils, predominated in both ripe and unripe fruits. Major constituents of essential oils extracted from ripe fruits (RF-EO) were (-caryophyllene (21.3%), (-ylangene (13.3%), germacrene-D (10.9%) and (-zingiberene (9.7%) whereas the ones of unripe fruits (UF-EO) were sesquithujene (25.0%), (-zingiberene (18.2%), germacrene-D (13.1%) and (-copaene (12.7%). In vitro antibacterial activity of essential oils was evaluated in terms of its minimum inhibitory concentration (MIC) values by the broth microdilution method in 96-well microplates. Both essential oils under investigation showed moderate anti-streptococcal activity against the following bacteria: Streptococcus mutans, S. mitis, S. sanguinis, S. sobrinus and S. salivarius. MIC values ranged between 100 and 400 µg/mL. Regarding the antimycobacterial activity, essential oils from M. paniculata (L.) Jack unripe and ripe fruits were active against Mycobacterium kansasii (MIC = 250 µg/mL), moderately active against M. tuberculosis (MIC = 500 µg/mL) and inactive against M. avium (MIC = 2000 µg/mL). This study was pioneer in revealing similar chemical profiles of both essential oils extracted from Murraya paniculata (L.) Jack unripe and ripe fruits, besides describing their in vitro anti-streptococcal and antimycobacterial activities.

Prevalence and Species Spectrum of Pulmonary Nontuberculous Mycobacteria Isolates at a Tertiary Care Center / 대한임상미생물학회지

BACKGROUND: Pulmonary infection with nontuberculous mycobacteria (NTM) is increasing in South Korea. Since treatment strategy differs by NTM species, accurate identification is necessary. In this study, using Mycobacterium pulmonary isolates recently recovered from a general hospital in Seoul, the prevalence of NTM isolates was investigated. METHODS: A total of 483 Mycobacterium pulmonary strains isolated between May and November 2018 from an 814-bed general hospital in South Korea were analyzed. Bacterial species were identified based on nucleotide sequences of the 16S–23S rDNA internal transcribed spacer and the rpoB gene. RESULTS: From a total of 1,209 pulmonary specimens from patients suspected to be infected with mycobacteria, 324 deduplicate strains were isolated, comprising 90 Mycobacterium tuberculosis and 229 NTM strains. Among the NTM isolates, 61.5% (n=144) were Mycobacterium avium complex (MAC), including 92 M. avium and 52 Mycobacterium intracellulare, while 8.1% (n=19) represented Mycobacterium abscessus, including 10 M. abscessus subsp. abscessus and 9 M. abscessus subsp. massiliense. In addition, 12 (5.1%) Mycobacterium lentiflavum, 12 (5.1%) Mycobacterium gordonae, 6 (2.6%) Mycobacterium kansasii, and 5 (2.1%) Mycobacterium fortuitum were identified. In addition, Mycobacterium mucogenicum (n=2), Mycobacterium septicum (n=1), Mycobacterium colombiens (n=1), Mycobacterium asiaticum (n=1), and Mycobacterium celatum (n=1) were identified. CONCLUSION: Among the recently recovered Mycobacterium pulmonary strains, more than half were identified as NTM, and MAC was the most prevalent NTM, followed by M. abcessuss.

Whole genome sequence of Mycobacterium kansasii isolates of the genotype 1 from Brazilian patients with pulmonary disease demonstrates considerable heterogeneity

Mycobacterium kansasii is an opportunistic pathogen and one of the most commonly encountered species in individuals with lung disease. We here report the complete genome sequence of 12 clinical isolates of M. kansasii from patients with pulmonary disease in Brazil.

Changing Epidemiology of Nontuberculous Mycobacterial Lung Diseases in a Tertiary Referral Hospital in Korea between 2001 and 2015

This study investigated the changes in the major etiologic organisms and clinical phenotypes of nontuberculous mycobacterial lung disease (NTM-LD) over a recent 15-year period in Korea. The increase of number of patients with NTM-LD was primarily due to an increase of Mycobacterium avium complex (MAC) lung disease (LD). Among MAC cases, the proportion of M. avium increased compared with M. intracellulare, whereas the incidence of M. abscessus complex and M. kansasii LD remained relatively stable. The proportion of cases of the nodular bronchiectatic form increased compared with the fibrocavitary form of NTM-LD.

Micobacteriosis pulmonar por Mycobacterium kansasii / Micobacteriosis pulmonar por Mycobacterium kansasii

Micobacterias no tuberculosas (MNT) es una designación utilizada para referirse a un gran número de especies de micobacterias ambientales potencialmente patógenas y no patógenas, distintas de la Mycobacterium tuberculosis y Mycobacterium leprae. Mycobacterium kansasii (M. Kansasii) es una MNT oportunista causante de infecciones pulmonares, cutáneas, entre otras, cuya tasa de incidencia ha ido incrementando en los últimos años a nivel mundial. A través de presentar el siguiente caso se pretende aportar al conocimiento con respecto al abordaje de pacientes con infección por MNT a nivel pulmonar, dirigido a médicos que trabajan en atención primaria de salud (APS). Se trata del caso de una paciente de 46 años de edad que acude al Hospital Provincial General Docente de Riobamba (HPGDR) con infección por MNT a nivel pulmonar. En el examen microscópico se detectaron Bacilos­Ácido­Alcohol­Resistentes (BAAR) mientras en el cultivo de esputo más antibiograma se aisló M. kansasii resistente a los antibióticos utilizados para la terapia convencional de tuberculosis. Se trata de un caso raro en la práctica clínica. Es crucial saber cómo manejar una infección con M. kansasii debido a su implicación para la salud del paciente y el sistema de salud nacional. El médico de APS debe reconocer su papel fundamental y la importancia que tiene un diagnóstico oportuno y tratamiento adecuado.

Non­tuberculous mycobacteria (NTM) is a designation for a large number of mycobacterial species potentially pathogenous and non­pathogenous, different than Mycobacterium tuberculosis and Mycobacterium leprae. Mycobacterium kansasii (M. kansasii) is an opportunistic NTM that causes among other things, pulmonary and cutaneous infections, whose incidence is increasing worldwide. Trough the following case report we seek to provide a guide to physicians working on primary health care (PHC) on the management of patients with pulmonary infection caused by NTM. We report the case of a 46­year­old female patient who came to the Hospital Provincial General Docente de Riobamba (HPGDR) with a pulmonary infection caused by NTM. In the microscopic examination it was identified Acid­Fast Bacilli (AFB), meanwhile the microbiological culture and antibiogram it was isolated M. kansasii resistant to common antibiotics used for conventional tuberculosis therapy. It is a rare case in the clinical practice. It is crucial to know how to manage an infection with M. Kansasii due to its implication on the health of affected subjects and the national health system. A physician working on PHC has to know his/her fundamental role and the importance of an early diagnosis and adequate treatment.

Mycobacterium kansasii Pneumonia with Mediastinal Lymphadenitis in a Patient with Acute Myeloid Leukemia: Successful Treatment to Stem Cell Transplantation

Non-tuberculous mycobacterial (NTM) disease is a relatively rare cause of neutropenic fever in patients with hematologic malignancies. During the neutropenic period, performing invasive procedures for microbiological or pathological confirmation is difficult. In addition, the optimal treatment duration for NTM disease in patients with leukemia, especially prior to stem cell transplantation (SCT), has not been documented. Therefore, we report a case of pneumonia with necrotizing lymphadenitis caused by Mycobacterium kansasii diagnosed during chemotherapy being performed for acute myeloid leukemia. The radiologic findings were similar to those of invasive fungal pneumonia; however, a bronchoalveolar washing fluid culture confirmed that the pathogen was M. kansasii. After 70 days from starting NTM treatment, allogeneic SCT was performed without any complications. The patient fully recovered after 12 months of NTM treatment, and neither reactivation of M. kansasii infection nor related complications were reported.

Nontuberculous Mycobacterium Arthritis and Spondylitis in a Patient with Lupus

Approximately 90% of nontuberculous mycobacterium (NTM) infections involve the pulmonary system; NTM infections involving areas of the musculoskeletal system such as the joints or spine are uncommon. This report describes a case of refractory knee swelling in a patient with systemic lupus erythematosus (SLE). Indolent arthritis of the knee eventually progressed to spondylitis and a paraspinal abscess requiring surgical incision and drainage. The cause of the infectious arthritis and spondylitis was diagnosed as NTM infection, specifically Mycobacterium kansasii. This case emphasizes the importance of a high index of clinical suspicion for mycobacterial infection, as well as repeated attempts to isolate the organism, in patients with SLE who present with atypical chronic arthritis.

Diagnosis and Treatment of Nontuberculous Mycobacterial Lung Disease: Clinicians' Perspectives / 결핵및호흡기질환

Nontuberculous mycobacteria (NTM) are emerging pathogens that affect both immunocompromised and immunocompetent patients. The incidence and prevalence of NTM lung disease are increasing worldwide and rapidly becoming a major public health problem. For the diagnosis of NTM lung disease, patients suspected to have NTM lung disease are required to meet all clinical and microbiologic criteria. The development of molecular methods allows the characterization of new species and NTM identification at a subspecies level. Even after the identification of NTM species from respiratory specimens, clinicians should consider the clinical significance of such findings. Besides the limited options, treatment is lengthy and varies by species, and therefore a challenge. Treatment may be complicated by potential toxicity with discouraging outcomes. The decision to start treatment for NTM lung disease is not easy and requires careful individualized analysis of risks and benefits. Clinicians should be alert to those unique aspects of NTM lung disease concerning diagnosis with advanced molecular methods and treatment with limited options. Current recommendations and recent advances for diagnosis and treatment of NTM lung disease are summarized in this article.

Infección respiratoria por mycobacterium kansasii / Respiratory infection by mycobacterium kansasii

INTRODUCCIÓN: la afectación pulmonar por micobacterias no tuberculosas puede ocurrir en pacientes con enfermedades pulmonares previas o en inmunodeprimidos, aunque también se presenta en personas sin enfermedad anterior. OBJETIVO: conocer el comportamiento de las infecciones respiratorias por Mycobacterium kansasii en pacientes expuestos al polvo del mineral laterítico. MÉTODOS: se realizó un estudio observacional, descriptivo, prospectivo, de serie de casos, sobre infección respiratoria por Mycobacterium kansasii en pacientes ingresados en el Hospital "Guillermo Luis Fernández" del municipio Moa, Holguín, durante los años 2003-2012. RESULTADOS: la enfermedad fue diagnosticada en 6 pacientes, todos del sexo masculino; el 70 % tenía de 30 a 39 años; 83,33 % presentó tos, la cual fue el síntoma predominante; en el 66,66 % el examen físico resultó normal. El 100 % de los enfermos presentaron imágenes cavitarias en la radiografía de tórax. CONCLUSIONES: la infección respiratoria por Mycobacterium kansasii predominó en pacientes jóvenes, del sexo masculino, el síntoma fundamental fue la tos y predominó la imagen cavitaria en la radiografía de tórax.

INTRODUCTION: pulmonary involvement non-tuberculous mycobacteria may occur in patients suffering pre-existing lung diseases or who are immune-suppressed, but it also occurs in persons with no previous illness. OBJECTIVE: know the behavior of Mycobacterium kansasii respiratory infections in patients exposed to dust from lateritic ore. METHODS: an observational, descriptive, prospective, case series study on Mycobacterium kansasii respiratory infection was performed in patients admitted to Guillermo Luis Fernández Hospital in Moa, Holguin, from 2003 to 2012. RESULTS: the disease was diagnosed in 6 patients, all males. 70 % were 30 to 39 years old; 83.33 % had cough, which was the predominant symptom; 66.66 % was normal at the physical examination. 100% of patients had cavity images in chest x-rays. CONCLUSIONS: a Mycobacterium kansasii respiratory infection was most frequent in male younger patients. The main symptom was cough, and most frequent cavity images in x-ray.

A Case of Pulmonary Mycobacterium kansasii Disease Complicated with Tension Pneumothorax / 결핵및호흡기질환

Pneumothorax is an extremely rare complication of non-tuberculous mycobacterial infection. A 52-year-old man presenting with difficulty breathing and chest pain was admitted to our hospital. A right-sided pneumothorax was observed on chest radiography and chest computed tomography showed multiple cavitating and non-cavitating nodules with consolidation in the upper to middle lung zones bilaterally. Serial sputum cultures were positive for Mycobacterium kansasii, and he was diagnosed with pulmonary M. kansasii disease complicated by tension pneumothorax. After initiation of treatment including decortications and pleurodesis, the patient made a full recovery. We herein describe this patient's course in detail and review the current relevant literature.

Evaluation of Peptide Nucleic Acid Probe-Based Fluorescence In Situ Hybridization for the Detection of Mycobacterium tuberculosis Complex and Nontuberculous Mycobacteria in Clinical Respiratory Specimens / 대한임상미생물학회지

BACKGROUND: Tuberculosis is globally the most important cause of death from single pathogen. Rapid and accurate identification of mycobacteria is essential for the control of tuberculosis. We evaluated a fluorescence in situ hybridization (FISH) method using peptide nucleic acid (PNA) probes for the differentiation of Mycobacterium tuberculosis complex (MTB) and nontuberculous mycobacteria (NTM) in direct smears of sputum specimens. METHODS: The cross-reactivity of MTB- and NTM-specific PNA probes was examined with reference strains of M. tuberculosis ATCC 13950, Mycobacterium kansasii ATCC 12479, Mycobacterium fortuitum ATCC 6841, several clinical isolates of mycobacteria (Mycobacterium abscessus, Mycobacterium avium, Mycobacterium intracellulare, Mycobacterium gordonae and Mycobacterium chelonae), and 11 frequently isolated respiratory bacterial species other than mycobacteria. A series of 128 sputa (89 MTB culture positive, 29 NTM culture positive, and 10 under treatment culture negative) with grades of trace to 4+ were used to evaluate the performance of the method. RESULTS: The MTB- and NTM-specific PNA probes showed specific reactions with the reference strains of MTB and M. kansasii and clinical isolates of mycobacteria except M. fortuitum ATCC 6841, and no cross-reactivity with other tested bacteria. The PNA probe-based FISH assay for detection of MTB had a sensitivity and specificity of 100%, respectively. The sensitivity and specificity of the NTM-specific PNA probe was 100%. The smear grades of the PNA FISH test were same as with those of the fluorescence AFB stain in 2+ or higher grade. CONCLUSION: Detection and differentiation based on PNA FISH is sensitive and accurate for detecting mycobacteria and for differentiating MTB from NTM in clinical sputum smears.

Abscess resulting from Mycobacterium kansasii in the left thigh of AIDS patient

A case of abscess resulting from Mycobacterium kansasii, in the left thigh of a 53-year-old woman infected with the Human Immunodeficiency virus, is reported. Curiously, there was no pulmonary or systemic involvement as is usual with these Mycobacterium infections. The patient had CD4 T lymphocyte count of 257 cells/µL and a viral load of 60,154 copies. Despite presenting a relatively preserved immunity, the patient also presented Criptococcic meningoencephalitis and Esophageal candidiasis. The patient responded satisfactorily to treatment for infections and after 51 days was discharged.

A Case of Mycobacterium kansasii Pulmonary Disease Presenting as Endobronchial Lesions in HIV-Infected Patient / 결핵및호흡기질환

Incidence of nontuberculous mycobacterium (NTM) pulmonary disease is increasing with the wider recognition and development of diagnostic technology. Mycobacterium kansasii is the second most common pathogen of NTM pulmonary disease in human immunodeficiency virus (HIV)-infected patients. However in Korea, the incidence of M. kansasii pulmonary disease is relatively low, and there has been no report of M. kansasii pulmonary disease with bronchial involvement in HIV patients, to the best of our knowledge. We report a case of M. kansasii pulmonary disease presenting with endobronchial lesions in an HIV-infected patient complaining of chronic cough with bilateral enlargements of hilar lymph nodes on chest X-ray.

A Case of Mycobacterium kansasii Lymphadenitis in HIV-infected Patient

Nontuberculous mycobacteria (NTM) are widely present in the environment, although they rarely cause infection in humans. However, infection by NTM has been increasingly recognized worldwide in the context of the human immunodeficiency virus (HIV) epidemic and therapeutic immunosuppression. Mycobacterium kansasii is a slow-growing photochromogenic mycobacterium, which mainly causes pulmonary infection in patients with predisposing lung diseases, and, occasionally, disseminated infection with poor outcomes in immunocompromised patients. We report on the first case of lymphadenitis caused by infection with M.kansasii in an HIV-infected patient in Korea. The patient showed significant improvement after receiving antituberculous therapy (isoniazid, rifabutin) in combination with surgical drainage and highly active antiretroviral therapy (abacavir, lamivudine, and lopinavir/ritonavir).

Disseminated Mycobacterium kansasii in an HIV-negative patient

Disseminated Mycobacterium kansasii infection is a rare infection in non-HIV patients. This research has uncovered a very rare manifestation of disseminated M. kansasii infection in a non-HIV patient with lung and pericardial involvement

A Case of Mycobacterium kansasii Cutaneous Infection in a Heart Transplant Recipient / 대한내과학회지

Mycobacterium kansasii is a slow-growing, nontuberculous mycobacterium (NTM) that primarily affects lung tissue. Cutaneous infection with M. kansasii has not been reported previously in heart transplant recipients in Korea. We report a case of cutaneous infection caused by M. kansasii in a heart transplant recipient. The patient was treated successfully for 18 months with ciprofloxacin, clarithromycin, ethambutol, and rifampin.

A Case of Mycobacterium kansasii Cutaneous Infection in a Heart Transplant Recipient / 대한내과학회지

Mycobacterium kansasii is a slow-growing, nontuberculous mycobacterium (NTM) that primarily affects lung tissue. Cutaneous infection with M. kansasii has not been reported previously in heart transplant recipients in Korea. We report a case of cutaneous infection caused by M. kansasii in a heart transplant recipient. The patient was treated successfully for 18 months with ciprofloxacin, clarithromycin, ethambutol, and rifampin.

Nontuberculous mycobacteria: susceptibility pattern and prevalence rate in Shanghai from 2005 to 2008 / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>An increasing incidence of disease caused by nontuberculous mycobacteria (NTM) is being reported. The purpose of this study was to determine the isolation rates of NTM from various clinical specimens, and their antimicrobial susceptibility patterns, over a 4-year period in Shanghai.</p><p><b>METHODS</b>All NTM isolated between 2005 and 2008 at Shanghai Pulmonary Hospital, a key laboratory of mycobacteria tuberculosis in Shanghai, China, were identified with conventional biochemical tests and 16S rRNA gene sequencing. Antimicrobial susceptibility for all NTM was determined using the BACTEC MGIT 960 system.</p><p><b>RESULTS</b>A total of 21,221 specimens were cultured, of which 4868 (22.94%) grew acid fast bacilli (AFB), and 248 (5.09%) of the AFB were NTM. The prevalence rate of NTM was determined as 4.26%, 4.70%, 4.96% and 6.38% among mycobacteria culture positive samples in years 2005, 2006, 2007 and 2008 respectively. These data indicated that the prevalence rate has continuously increased. Sixteen different species of NTM were identified, the most commonly encountered NTM in Shanghai were M. chelonae (26.7%), followed by M. fortuitum (15.4%), M. kansasii (14.2%), M. avium-intracellulare complex (13.1%) and M. terrae (6.9%). The rare species identified were M. marinum, M. gastri, M. triviale, M. ulcerans, M. smegmatis, M. phlci, M. gordonae, M. szulgai, M. simiae, M. scrofulaceum and M. xenopi. The five most commonly identified NTM species showed high drug resistance to general anti-tuberculosis drugs, particularly, M. chelonae and M. fortuitum appear to be multi-drug resistance.</p><p><b>CONCLUSIONS</b>The prevalence of NTM in Shanghai showed a tendency to increase over the course of the study. The five most commonly isolated NTM species showed high drug resistance to first line anti-tuberculosis drugs.</p>