Malaria smear positivity among Kenyan children peaks at intermediate temperatures as predicted by ecological models

Ambient temperature is an important determinant of malaria transmission and suitability, affecting the life-cycle of the Plasmodium parasite and Anopheles vector. Early models predicted a thermal malaria transmis...
Source: Parasites and Vectors - Category: Microbiology Authors: Tags: Research Source Type: research

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y Luis Carlos Gómez-Nieto Malaria has been for millennia one of the best known and most destructive diseases affecting humans. Its high impact has aroused great interest for the development of new effective and reliable diagnostic techniques. Recently it has been recently published that hairs from mammal hosts are able to capture, hold and finally remove foreign DNA sequences of Leishmania parasites. The aim of this study was to check if Plasmodium falciparum (P. falciparum) DNA remains stable in blood samples deposited in Whatman paper after suffering different transport and storage conditions, and to compare...
Source: International Journal of Environmental Research and Public Health - Category: Environmental Health Authors: Tags: Article Source Type: research
In this study, it was aimed to compare the results of three different molecular methods and determine which molecular method could be used in the diagnostic algorithm to be applied. DNA was extracted from 280 whole blood sample stored in EDTA tubes using a commercial kit. Three different polymerase chain reaction (PCR) methods were used for the detection of Plasmodium spp. in DNA samples obtained and the results were compared. First, multiplex nested PCR was applied and then in-house real-time PCR (Rt-PCR) which was validated in our laboratory and a commercial Rt-PCR kit were applied. Multiplex nested PCR was accepted as t...
Source: Mikrobiyoloji Bulteni - Category: Microbiology Tags: Mikrobiyol Bul Source Type: research
AbstractMalaria is one of most important parasitic disease, which is still much prevalent in India. The burden of malaria in India is complex and the proportions of  Plasmodium vivax and Plasmodium falciparum vary across India, because of the highly variable malaria eco-epidemiological profiles, transmission factors, and the presence of multiple Plasmodium species and Anopheles vectors. The diagnostic modalities which were being used currently, are at the risk of missing potential malaria cases, if a single test is being used for a given sample. There are some extremely sensitive and...
Source: Journal of Parasitic Diseases - Category: Parasitology Source Type: research
This study included a total of 150 study participants, 87 (58%) females and 63 (42%) males. The patients included in the study did not receive any antimalarial drug. The mean age of the study participants was 31.6 ± 12.4 with the majority of participants being between 25 and 44 years and the minority being above 65 years. The sensitivity of RDT (HRP-2) was calculated and found to be 95.0%, whereas the sensitivity of Giemsa microscopy was 100%. The specificity of RDT (HRP-2) was calculated and found to be 59.2%, whereas the specificity of Giemsa microscopy was 100%. Negative and positive predictive valu...
Source: Journal of Tropical Medicine - Category: Tropical Medicine Tags: J Trop Med Source Type: research
AbstractMalaria, an important parasitic disease worldwide, still has diagnostic challenges in the laboratory. Many studies have been conducted on the detection ability of haematology analysers for malaria. We evaluated the Sysmex XN-series analyser as a tool for detection of malaria by analysing the leukocyte cell population data (LCPD), scattergrams and associated Flow Cytometry Standard (FCS) data from both the WNR (white cell nucleated) and WDF (white cell differential) channels. 1281 clinically suspected cases of malaria were screened for malaria by peripheral blood smear examination and were run in the Sysmex XN-1000 ...
Source: Indian Journal of Hematology and Blood Transfusion - Category: Hematology Source Type: research
ConclusionsOur study confirmed thatP. falciparum is the dominant species in the sahelian zone and that malaria transmission is seasonal and associated with rainfall in this zone. The application of the current national policy based on rapid and reliable malaria diagnosis, case management with artemisinin-based combination therapy, intermittent preventive treatment for pregnant women, distribution and use of long-lasting insecticide impregnated bed nets, and the planned introduction of seasonal malaria chemoprevention for all children under 6  years old is expected to sustainably reduce malaria transmission in this zone.
Source: Infectious Diseases of Poverty - Category: Infectious Diseases Source Type: research
We present a low-cost alternative and complementary solution for rapid malaria screening for low resource settings to potentially reduce the dependence on manual microscopic examination. We develop an image processing pipeline using a modified YOLOv3 detection algorithm to run in real time on low-cost devices. We test the performance of our solution on two datasets. In the dataset collected using a microscope camera, our model achieved 99.07% accuracy and 97.46% accuracy on the dataset collected using a mobile phone camera. While the mean average precision of our model is on par with human experts at an object level, we ar...
Source: Journal of Digital Imaging - Category: Radiology Source Type: research
We present here a retrospective comparative study for RDT and PCR (nested and high-resolution-melting quantitative PCR [HRM-qPCR]) evaluation of ACPR in a nonendemicity context. Blood samples from 133 patients presenting a Plasmodium falciparum monoinfection were included. Samples obtained at the time of diagnosis and at 3, 7, and 28 days after diagnosis were investigated. Histidine-rich protein 2 (HRP-2)-based RDT results remained positive in 51% of cases 28 days after diagnosis and appropriate therapeutic management. Parasite DNA was detected by the two PCR techniques (nested PCR and HRM-qPCR) in 12% and 10% of samples 2...
Source: Journal of Clinical Microbiology - Category: Microbiology Authors: Tags: Parasitology Source Type: research
Abstract Malaria endemicity in Cameroon greatly varies according to ecological environment. In such conditions, parasitaemia, which is associated with fever, may not always suffice to define an episode of clinical malaria. The evaluation of malaria control intervention strategies mostly consists of identifying cases of clinical malaria and is crucial to promote better diagnosis for accurate measurement of the impact of the intervention. We sought out to define and quantify clinical malaria cases in children from three health districts in the Northern region of Cameroon. A cohort study of 6,195 children aged betwee...
Source: Biomed Res - Category: Research Authors: Tags: Biomed Res Int Source Type: research
Conclusion: Metabolite extract of S. hygroscopicus subsp. hygroscopicus causes morphological damage, decreases the degree of parasite-infected erythrocytes and the DNA density of P. falciparum 3D7 in vitro. PMID: 31673263 [PubMed]
Source: Iranian Journal of Parasitology - Category: Parasitology Tags: Iran J Parasitol Source Type: research
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