Malarial anemia is a global public health problem and is characterized by a low reticulocyte response in the presence of life-threatening hemolysis. Although cytokines, in particular tumor necrosis factor-␣ (TNF-␣), can suppress erythropoiesis, the grossly abnormal bone marrow morphology indicates that other factors may contribute to ineffective erythropoiesis. We hypothesized that the cytotoxic hemozoin (Hz) residues from digested hemoglobin (Hb) significantly contribute to abnormal erythropoiesis. Here, we show that not only isolated Hz, but also delipidated Hz, inhibits erythroid development in vitro in the absence of TNF-␣. However, when added to cultures, TNF-␣ synergizes with Hz to inhibit erythropoiesis. Furthermore, we show that, in children with malarial anemia, the proportion of circulating monocytes containing Hz is associated with anemia (P < .001) and reticulocyte suppression (P ‫؍‬ .009), and that this is independent of the level of circulating cytokines, including TNF-␣. Plasma Hz is also associated with anemia (P < .001) and reticulocyte suppression (P ‫؍‬ .02). Finally, histologic examination of the bone marrow of children who have died from malaria shows that pigmented erythroid and myeloid precursors are associated with the degree of abnormal erythroid development. Taken

Objective To assess the knowledge and attitudes towards attention deficit hyperactivity disorder (ADHD) among primary school teachers in the Gampaha District. Methods A descriptive cross sectional study was conducted in randomly selected schools of Gampaha district using a stratified sampling method. The knowledge and attitudes on ADHD were assessed by a self-administered questionnaire distributed among all the consenting primary school teachers in the selected schools. Results Total of 202 completed questionnaires of 210 distributed were returned. The majority showed good understanding about ill effects of ADHD, teachers' role in management and counterproductive effects of punishment. Three-fourths had a positive attitude towards behavioural therapy. However, only a minority had adequate knowledge about the presentation of ADHD and its treatment with medication. More than 80% of teachers believed that the parents were to be blamed for the child's ADHD. The majority of participating teachers also believed that behavioural disturbances caused by ADHD children were deliberate and malicious. Teachers who had training in child psychology recorded a significantly higher knowledge and had a more favourable attitude. Conclusions The knowledge of ADHD and its treatment among primary school teachers needs to be improved. Particular focus should be on improving attitudes and disseminating the message that timely interventions can make a difference in the educational and social development of the child.

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Key Points• In low-risk BMT for thalassemia, ATGBuCy seems as effective as Tt-BuCy in the prevention of rejection and may decrease transplant-related mortality. received ATG-BuCy. All patients were ,15 years and had no hepatomegaly (liver #2 cm from costal margin). Actuarial overall survival in the Tt-BuCy and ATG-BuCy groups was 87% and 94% and thalassemia-free survival was 80% and 85% at a median follow-up of 37 and 17 months, respectively, with no significant differences by log-rank statistics. SubstitutingTt with ATG in the standard BuCy context seems safe and effective and may decrease transplant-related mortality. Higher fertility rates are expected for patients who received ATG-BuCy.

Background The Sri Lankan traditional betel quid (TBQ) which had been extensively used in the country before its colonization is claimed to have antiperiodontopathic effects in the Sri Lankan folklore. However, there is no reported scientific evidence to support the claimed antiperiodontopathic effects mediated by this TBQ. The present study was carried out to investigate the protective effect of the Sri Lankan TBQ in the pathogenesis of periodontitis. Methods We investigate the ethyl acetate extract of the Sri Lankan TBQ for its antibacterial effects against the keystone periodontopathic bacterium, P. gingivalis and also its antioxidant potential, which is important to protect the periodontium from oxidative stress. Further, its safety was analyzed using the cytokinesis block micronucleus assay on human peripheral blood lymphocytes (PBLs). Results Ethyl acetate extract of this TBQ inhibited the growth of P. gingivalis with a minimum bactericidal concentration (MBC) of 125 μg/ml. It was found to be a rich source of polyphenols and displayed considerable DPPH and ABTS radical scavenging activities and a strong ferric reducing antioxidant power. This extract could protect the cultured human gingival fibroblasts from H 2 O 2 induced oxidative stress. In addition, this TBQ extract was not genotoxic to human PBLs even at a concentration of 2.5 mg/ml. Moreover, it exhibited protective effects against bleomycin induced genotoxicity in PBLs. Conclusion Ethyl acetate extract of the Sri Lankan TBQ is a source of natural antibacterial compounds against P. gingivalis . It is also a source of natural antioxidants which can protect human gingival fibroblasts from H 2 O 2 induced oxidative stress. These properties of the TBQ may have contributed to its claimed antiperiodontopathic effects. Besides, it was found to be relatively non-toxic to human cells. Thus this TBQ extract has a huge potential to be developed as a novel adjunctive therapeutic lead against periodontitis.