Background: The diagnosis of leprosy is based on the characteristic signs and symptoms of the disease, subsidized by laboratory tests. When positive, the bacilloscopy closes the diagnosis for leprosy. Phenolic glycolipid-I, or PGL-I, is a molecule in the bacillus cell wall that confers a greater immune response. The ML Flow test is an immunochromatographic test for the detection of anti-PGL-I IgM in human blood or serum. Methods: A prospective study with data collection and biological materials in patients with suspected leprosy from August 2020 to May 2021. For microscopy, intradermal smears were stained with Auramine O, and after reading under a fluorescence microscope, reviewed by Ziehl–Neelsen. The ML flow test was performed according to the Bührer-Sékula protocol. To assess the agreement between the methods, the Kappa index was estimated. Results: Of the 94 suspected leprosy patients, 31 (32.9%) were diagnosed with leprosy. There was moderate agreement between the results of the ML Flow and Auramine O tests (Kappa = 0.58) and substantial agreement between the ML Flow and Ziehl–Neelsen microscopy (Kappa = 0.72). In paucibacillary cases, serology was positive in 100% of patients. Conclusions: This study concluded that the Ziehl–Neelsen technique remains the best option for standard leprosy staining, and the ML flow test is more positive among the three techniques evaluated and can be an effective tool in the early diagnosis of leprosy cases.
Objetivo: To present the situational diagnosis of the leprosy laboratory reference network in the region of São José do Rio Preto, SP, Brazil. Methods: This was an evaluation study with a descriptive design. The data were collected by means of an online form filled in by those in charge of the leprosy program in 2018. Results: All 102 municipalities that make up the region provided the requested data, 82.4% (84/102) requested slit-skin smear microscopy and of these 68 received training. Of the total, 11.7% sent slit-skin smears to other laboratories outside the reference network. Only 57.8% (59/102) requested a biopsy, of these 47 had a doctor responsible for taking the biopsy sample and 31 did not send biopsy samples for analysis in the reference network. Lack of an adequate room, few trained professionals, absence of material for transportation and absence of printed test requisitions were described as aspects that hinder leprosy case diagnosis in the region. Conclusion: The laboratory network is fragile and needs to be restructured.
O objetivo do estudo foi demonstrar a experiência exitosa no isolamento axênico de promastigotas de Leishmania infantum (L. infantum) em cultura, utilizando meios de agar base enriquecido com sangue desfibrinado de equino (SDE). No estudo foram utilizadas amostras de aspirado de linfonodo e fragmentos de baço, fígado e linfonodo, de cão infectado com a doença. Os meios de culturas empregados para o isolamento do parasito foram bifásico (sólido e líquido) e monofásico (líquido). Para a fase bifásica utilizou-se o Agar Sangue Base (BAB) e Neal Novy Nicolle (NNN), ambos enriquecidos com SDE, que após solidificação adicionou-se caldo de Brain Heart Infusion (BHI). Para fase monofásica utilizou-se o Meio 199 (M199) suplementado com 10% de soro fetal bovino (SFB). As amostras foram semeadas em duplicata, utilizando os protocolos: (NNN+SDE), (BAB+SDE) e (M199+SFB), mantidas em estufa por demanda bioquímica de oxigênio à 25ºC por 15 dias. Leituras microscópicas foram realizadas diariamente para acompanhamento da fase primária de crescimento do parasito. Após isolamento primário, as amostras foram seriadas e diluídas com concentração final de 1x106 parasitos/mL, para avaliação da curva de crescimento. O estudo demonstrou que nos tubos contendo meios bifásicos NNN e BAB enriquecido com SDE, o crescimento primário de parasito foi de 72 horas, enquanto para os tubos suplementados com SFB foi de 96 horas. Em relação à curva de crescimento observou-se que durante a fase exponencial, as amostras contendo fragmentos de baço, fígado e linfonodo enriquecidos SDE obtiveram maiores concentrações de promastigotas, quando comparado às amostras suplementadas com SFB, sendo 189x106 e 128x106 parasitos/mL, respectivamente. Na análise estatística, houve diferença significativa (p<0,05) do percentual de número de promastigotas isoladas em meio enriquecido com SDE, quando comparado ao meio com SFB. Os tubos primários mantiveram-se viáveis em todo o período de estudo, mesmo após repiques utilizados para manutenção do parasito. A técnica tradicional de isolamento do parasito em meio de cultura mais comumente utilizada é em agar base enriquecido com sangue de coelho, no entanto, dificuldades operacionais na aquisição deste enriquecedor tem impulsionado a busca por outras fontes de suplementação proteica, para cultivo de L. infantum. O estudo revela que a utilização de SDE, como meio enriquecedor alternativo de cultivo para o isolamento primário de L. infantum foi viável para ser usado em nossa rotina laboratorial.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.