Multidrug-Resistant Nontuberculous Mycobacteria Isolated from Cystic Fibrosis Patients

Worldwide, nontuberculous mycobacteria (NTM) have become emergent pathogens of pulmonary infections in cystic fibrosis (CF) patients, with an estimated prevalence ranging from 5 to 20%. This work investigated the presence of NTM in sputum samples of 129 CF patients (2 to 18 years old) submitted to longitudinal clinical supervision at a regional reference center in Rio de Janeiro, Brazil. From June 2009 to March 2012, 36 NTM isolates recovered from 10 (7.75%) out of 129 children were obtained. Molecular identification of NTM was performed by using PCR restriction analysis targeting the hsp65 gene (PRA-hsp65) and sequencing of the rpoB gene, and susceptibility tests were performed that followed Clinical and Laboratory Standards Institute recommendations. For evaluating the genotypic diversity, pulsed-field gel electrophoresis (PFGE) and/or enterobacterial repetitive intergenic consensus sequence PCR (ERIC-PCR) was performed. The species identified were Mycobacterium abscessus subsp. bolletii (n = 24), M. abscessus subsp. abscessus (n = 6), Mycobacterium fortuitum (n = 3), Mycobacterium marseillense (n = 2), and Mycobacterium timonense (n = 1). Most of the isolates presented resistance to five or more of the antimicrobials tested. Typing profiles were mainly patient specific. The PFGE profiles indicated the presence of two clonal groups for M. abscessus subsp. abscessus and five clonal groups for M. abscesssus subsp. bolletii, with just one clone detected in two patients. Given the observed multidrug resistance patterns and the possibility of transmission between patients, we suggest the implementation of continuous and routine investigation of NTM infection or colonization in CF patients, including countries with a high burden of tuberculosis disease.     

Can Toll-Like Receptor (TLR) 2 be considered as a new target for immunotherapy against hepatitis B infection?

The current literature describes pivotal mechanisms in which hepatitis B virus (HBV) induces liver diseases including inflammation, cirrhosis and hepatocellular carcinoma (HCC). It appears that differences in genetic and immunological parameters between patients and controls may be responsible for inducing the prolonged forms of the infection. Previous studies demonstrated that Toll-Like Receptors (TLRs) play key roles in viral recognition and inducing appropriate immune responses. Therefore, TLRs can be considered as key sensors for HBV recognition and subsequent induction of immune responses against this virus. It has also been shown that the TLR2 detects several microbial PAMPs either in its homodimer form or in a heterodimer with TLR1 or TLR6 and subsequently activates NF-κB in a MYD88 dependent manner. Therefore, defective TLR2 expression may result in impaired immune responses against HBV which is reported in long-term forms of hepatitis B. This review presents the recent data regarding the status and important roles played by TLR2 in HBV recognition and induction or suppression of immune responses against HBV as well as its roles in the pathogenesis of cirrhosis and HCC in prolonged hepatitis B forms.     

Second malignant tumours in childhood Hodgkin's disease

This study was undertaken to determine the treatment-specific incidence of second malignant tumours (SMT) in childhood Hodgkin's disease. The institutional databases at The Hospital for Sick Children, the Princess Margaret Hospital, and the Toronto-Bayview Regional Cancer Centre were reviewed for the years 1958–1993. Three hundred and forty-three consecutive newly diagnosed children were evaluated. The overall 30 year cumulative SMT incidence was 31%. The 20 year SMT incidence was greater for patients who relapsed (n = 129), 27%, compared with patients who remained relapse free (n = 214), 13%. For patients with stage 1–3B disease who remained relapse free, the 10 year SMT rate was 7% for patients who were surgically staged and treated with extended field radiation treatment (EF RT) (35 G), compared with 3% in clinically staged patients treated with MOPP (six cycles) and EF RT (25–30 G). To date there is no significant difference in the oncogenicity of these treatment protocols. However, EF RT alone was less effective in disease control. For stages 1–3B, 62% of patients relapsed after EF RT alone compared with 18% after bimodal treatment. Therefore treatment intensification due to relapse was more frequent in the former group. The overall 10 year SMT incidence for patients treated with these protocols was 11% and 3%, respectively. The 20 year SMT incidence following EF RT alone was 24%. We conclude that SMTs were a common late complication in childhood Hodgkin's disease and are a limiting factor in the achievement of cure. The incidence of SMTs was increased in children who required retreatment and was minimal in children who remained in a first complete remission. Therefore the initial treatment strategy in childhood Hodgkin's disease must be to minimize the risk of relapse, in order to avoid the morbidity and mortality associated with both relapse and SMT induction, and to achieve this objective with a primary treatment protocol of low oncogenicity. © 1996 Wiley-Liss, Inc.     

Effect of Different Types of Intermittent Fasting on Biochemical and Anthropometric Parameters among Patients with Metabolic-Associated Fatty Liver Disease (MAFLD)—A Systematic Review

Metabolic-associated fatty liver disease (MAFLD), previously called non-alcoholic fatty liver disease (NAFLD), is the most common chronic liver disease worldwide. It is characterised by excessive fat accumulation in hepatocytes. Currently, no pharmacological therapy is effective for this disease, so non-pharmacological alternatives such as diet, supplementation or physical activity are being sought. For this reason, we reviewed the available databases to analyse the studies conducted to date using different modifications of intermittent fasting among patients with MAFLD. Eight studies using this dietary strategy were included in this review. The results obtained in the different trials are varied and do not allow a clear determination of the effect of the different types of intermittent fasting on anthropometric and biochemical parameters among patients with MAFLD. However, this type of diet seems to show some therapeutic potential, but further studies are needed.