Sequencing SARS-CoV-2 in the Americas
The COVID-19 Genomic Surveillance Regional Network was created in 2020 not only to strengthen the sequencing capacity in the participating laboratories, but also for them to establish a routine SARS-CoV-2 genomic sequencing, as a strategy to increase the amoun...t of genetic sequence data available to the global community, which is critical to support the development of diagnostic protocols, the information for vaccine development and to better understand the evolution and molecular epidemiology of the SARS-CoV-2.
more
Chinese Medicine, (2016) 11:37
Medicinal plants are globally valuable sources of herbal products, and they are disappearing at a high speed. This article reviews global trends, developments and prospects for the strategies and methodologies concerning the conservation and sustainable use of me...dicinal plant resources to provide a reliable reference for the conservation and sustainable use of medicinal plants. We emphasized that both conservation strategies (e.g. in situ and ex situ conservation and cultivation practices) and resource management (e.g. good agricultural practices and sustainable use solutions) should be adequately taken into account for the sustainable use of medicinal plant resources. We recommend that biotechnical approaches (e.g. tissue culture, micropropagation, synthetic seed technology, and molecular marker-based approaches) should be applied to improve yield and modify the potency of medicinal plants.
https://doi.org/10.1186/s13020-016-0108-7
more
Chagas disease caused by Trypanosoma cruzi is a public health issue in Latin America. This highly diverse parasite is divided into at least seven discrete typing units (DTUs) TcI-TcVI and Tcbat. Some DTUs have been associated with geographical distribution in epidemiological scenarios and clinical m...anifestations, but these aspects remain poorly understood. Many studies have focused on studying the parasite and its vectors/hosts, using a wide variety of genetic markers and methods. Here, we performed a systematic review of the literature for the last 20 years to present an update of DTUs distribution in the Americas, collecting ecoepidemiological information. We found that the DTUs are widespread across the continent and that there is a whole gamma of genetic markers used for the identification and genotyping of the parasite. The data obtained in this descriptor could improve the molecular epidemiology studies of Chagas disease in endemic regions.
more
This document summarizes current WHO guidance for public health surveillance of coronavirus disease 2019 (COVID-19) in humans caused by infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).
New elements include:
update of contact definitions, in line with latest cont...act tracing guidance
update of detection strategies in line with updated version of WHO SARS-CoV-2 testing guidance
reinfection evidence standardization and surveillance: molecular, genomic and immunological evidence of reinfection
inclusion of clinical case definition of Post COVID-19 condition as defined by WHO
definition of breakthrough infection
more
2nd edition. Children with TB comprise about 10-12% of the total TB cases diagnosed in the country. This burden is likely to be higher given the challenges in diagnosing TB in children. The symptoms of TB in children mimic those of other childhood diseases. Children do not readily expectorate and th...ey have pauci-bacillary TB hence some will be missed using bacteriological tests. The government has however introduced GeneXpert molecular testing that is more sensitive than microscopy in detecting TB. Health care workers therefore need a reference guide to obtaining sputum from children for testing. Treatment of TB in children has been reviewed and now includes Ethambutol. There are now improved paediatric friendly TB medicines for treatment of TB in children and health care workers need a reference guide to enable them accurately dispense the TB medicine to children. Malnutrition is a common predisposing factor for TB in children. On the other hand, TB predisposes children to malnutrition or worsens an existing state of malnutrition. Nutrition care and support forms an integral part of treatment for a child with TB disease.
more
Entretanto, à luz da possível introdução de um caso suspeito relacionado ao COVID-19 na Região das Américas, a Organização Pan-Americana da Saúde/Organização Mundial da Saúde (OPAS/OMS) recomenda que os Estados-membros garantam sua identificação oportuna, o envio de amostras a laborat...rios nacionais ou de referência e a implementação do protocolo de detecção molecular do COVID-19, dependendo da capacidade do laboratório. Até à data, o potencial patogênico e a dinâmica de transmissão do COVID-19 não são completamente claros. Por esta razão e à luz do conhecimento de outros vírus semelhantes (MERS-CoV, SRA-CoV), é necessário manter e reforçar as medidas de biossegurança e os equipamentos de proteção individual para o trabalho com amostras suspeitas de infecção com patógenos respiratórios.
more
Accessed 2017
Please Download all Documents directly from the website: https://www.finddx.org/tb-laboratory-standard-operating-procedures-sops/
Laboratory Quality (TB01), General Procedures (TB02), Specimen Handling (TB03), Microscopy Procedures (TB04), Culture and drugs susceptibility testing (T...B05), Molecular methods (TB06), Equipment use and maintenance (TB07).
more
The current document is anupdate of the guidelines developed by the EUCAST subcommittee on detection of resistance mechanisms. The EUCAST Steering Committee has carried out the current update. The document has been developed mainly for routine use in clinical laboratories and doesnot cover technical... procedures for identification of resistance mechanisms at a molecular level by reference or expert laboratories. However, much of the content is also applicable tonational reference laboratories. Furthermore, it is important to note that the document does not cover screening for asymptomatic carriage (colonization) of multidrug-resistant microorganismsor direct detectionof resistancein clinical samples.
more
The purpose of this document is to provide guidance on the use of pooled sample testing strategy in coronavirus disease (COVID-19)
testing laboratories of the African Union Member States for scaling up SARS-CoV-2 nucleic acid testing capacity with the available resources. The current document descr...ibes the effect of factors such as the prevalence of COVID-19 in the population to be tested, the homogeneity of pools, and the sensitivity of the molecular test in optimal pool size determination. It also highlights the importance of monitoring the prevalence of COVID-19 in a population to be tested and proper validation of the test, to limit the potential for false-negative results. Validation studies to determine the optimal pool size by testing laboratories are recommended as the optimum approach. A safe, simple ‘two-stage pooling’ option has been indicated in this guidance to be used by laboratories until such validation can be achieved.
more
Leishmaniasis is a vector-borne disease that is transmitted by sandflies and caused by obligate intracellular protozoa of the genus Leishmania. Human infection is caused by about 21 of 30 species that infect mammals. These include the L. donovani complex with 3 species (L. donovani, L. infantum, and... L. chagasi); the L. mexicana complex with 3 main species (L. mexicana, L. amazonensis, and L. venezuelensis); L. tropica; L. major; L. aethiopica; and the subgenus Viannia with 4 main species (L. (V.) braziliensis, L. (V.) guyanensis, L. (V.) panamensis, and L. (V.) peruviana). The different species are morphologically indistinguishable, but they can be differentiated by isoenzyme analysis, molecular methods, or monoclonal antibodies.
more
Dengue is a significant public health problem. There are four dengue virus serotypes identified; however, its diagnosis is difficult due to the existence of many viruses, bacteria, and parasites producing the same clinical presentation, being present in the same geographical area and even producing ...coinfections. Therefore, determining whether a person has, had, or is infected with dengue virus is of great importance. In order to do so, direct and indirect laboratory tests have been developed to identify the virus or part of its structure that generally detects the antibody response. These techniques are used for diagnosis, epidemiological studies, monitoring, assessment and production of vaccines and antivirals, etc. They range from the use of cell cultures, animal models, inoculation by insects, and serology tests to the use of detection molecular tests and quantification of genetic material that are described in this chapter herein, a brief explanation of this methodology, its strengths and weaknesses, and its application in the dengue research.
more
Severe and difficult asthma in a low- and middle-income country (LMIC) can relate to lack of availability of basic medications; potentially reversible factors such as poor adherence or comorbidities such as obesity inhibiting a good response to treatment; and (rarely) true severe, therapy-resistant ...asthma. However, definitions of severity should encompass not merely doses of prescribed medication, but also underlying risk. The nature of asthmatic airway disease shows geographical variation, and LMIC asthma should not be assumed to be phenotypically the same as that in high-income countries (HICs). The first assessment step is to ensure another diagnosis is not being missed. Largely, political action is needed if children with asthma are to get access to basic medications. If a child is apparently not responding to low dose, simple medications, the next step is not to increase the dose but perform a detailed assessment of what factors (for example co-morbidities such as obesity, or social factors like poor adherence) are inhibiting a treatment response; in most cases, an underlying reason can be found. An assessment of risk of future severe asthma attacks, side-effects of medication and impaired lung development is also important. True severe, therapy-resistant asthma is rare and there are multiple underlying molecular pathologies. In HICs, steroid-resistant eosinophilia would be treated with omalizumab or mepolizumab, but the cost of these is prohibitive in LMICs, the biomarkers of successful therapy are likely only relevant to HICs. In LMICs, a raised blood eosinophil count may be due to parasites, so treating asthma based on the blood eosinophil count may not be appropriate in these settings.
more
Background: The human helminth infections include ascariasis, trichuriasis, hookworm infections, schistosomiasis, lymphatic filariasis (LF) and onchocerciasis. It is estimated that almost 2 billion people worldwide are infected with helminths. Whilst the WHO treatment guidelines for helminth infecti...ons are mostly aimed at controlling morbidity, there has been a recent shift with some countries moving towards goals of disease elimination through mass drug administration, especially for LF and onchocerciasis. However, as prevalence is driven lower, treating entire populations may no longer be the most efficient or cost-effective strategy. Instead, it may be beneficial to identify individuals or demographic groups who are persistently infected, often termed as being “predisposed” to infection, and target treatment at them.
Methods: The authors searched Embase, MEDLINE, Global Health, and Web of Science for all English language, humanbased papers investigating predisposition to helminth infections published up to October 31st, 2017. The varying definitions used to describe predisposition, and the statistical tests used to determine its presence, are summarised. Evidence for predisposition is presented, stratified by helminth species, and risk factors for predisposition to infection are identified and discussed.
Results: In total, 43 papers were identified, summarising results from 34 different studies in 23 countries. Consistent evidence of predisposition to infection with certain species of human helminth was identified. Children were regularly found to experience greater predisposition to Ascaris lumbricoides, Schistosoma mansoni and S. haematobium than adults. Females were found to be more predisposed to A. lumbricoides infection than were males. Household clustering of infection was identified for A. lumbricoides, T. trichiura and S. japonicum. Ascaris lumbricoides and T. trichiura also showed evidence of familial predisposition. Whilst strong evidence for predisposition to hookworm infection was identified, findings with regards to which groups were affected were considerably more varied than for other helminth species.
Conclusion: This review has found consistent evidence of predisposition to heavy (and light) infection for certain human helminth species. However, further research is needed to identify reasons for the reported differences between demographic groups. Molecular epidemiological methods associated with whole genome sequencing to determine ‘who infects whom’ may shed more light on the factors generating predisposition.
more
The COVID-19 CARE pathway is a living tool to support health care workers visualize the current clinical and therapeutic recommendations to be considered in the care planning for patients with COVID-19.
The COVID-19 CARE pathway is aligned with the eighth version of the WHO Therapeutics and COVID...-19: living guideline published on the 14 January 2022 and the third version of the WHO COVID-19 Clinical management: living guidance published on the 23 November 2021.
more
PLoS Negl Trop Dis 14(1): e0007999. January 30, 2020 is the first-ever World Neglected Tropical Diseases Day (World NTD Day), a day when we celebrate the achievements made towards control of the world’s NTDs, yet recognize the daunting challenges we face in the control and elimination of these con...ditions.
more
Following review of the latest evidence, WHO recommends that TB-LAMP can be used as a replacement for microscopy for the diagnosis of pulmonary TB in adults with signs and symptoms of TB. It can also be considered as a follow-on test to microscopy in adults with signs and symptoms of pulmonary TB, e...specially when further testing of sputum smear-negative specimens is necessary.
more
Guidance for health care workers.
Both the REGN-EB3 and mAb114 are recommended for use in EVD. The two drugs should not be given together. The choice of which monoclonal antibody to use depends on availability, including emerging information about effectiveness.
Guidance for health care workers.
Both the REGN-EB3 and mAb114 are recommended for use in EVD. The two drugs should not be given together. The choice of which monoclonal antibody to use depends on availability, including emerging information about effectiveness.
Guidance for health care workers.
Both the REGN-EB3 and mAb114 are recommended for use in EVD. The two drugs should not be given together. The choice of which monoclonal antibody to use depends on availability, including emerging information about effectiveness.
The occurrence of a high percentage of couterfeit medicines on the global medicines market is often attributed to a lack of effective regulation and a weak enforcement capacity. This review, while focusing on counterfeit medicines and medical devices in developing countries, will present information... on their impact and how these issues can be addressed by regulation and control of the supply chain using technology appropriate to the developing world.
more