Resultados: 12

Effect of mass dihydroartemisinin-piperaquine administration in southern Mozambique on the carriage of molecular markers of antimalarial resistance

PLos ONE; 15 (10), 2020
Background Mass drug administration (MDA) can rapidly reduce the burden of Plasmodium falciparum (Pf). However, concerns remain about its contribution to select for antimalarial drug resistance. Methods We used Sanger sequencing and real-time PCR to determine the proportion of molecular markers associate...

IgM and IgG against Plasmodium falciparum lysate as surrogates of malaria exposure and protection during pregnancy

Malar. j. (Online); 17 (1), 2018
Background: Difficulties to disentangle the protective versus exposure role of anti-malarial antibodies hamper the identification of clinically-relevant immune targets. Here, factors affecting maternal IgG and IgMs against Plasmodium falciparum antigens, as well as their relationship with parasite infect...

Resisting and tolerating P. falciparum in pregnancy under different malaria transmission intensities

BMC med; 15 (1), 2017
Resistance and tolerance to Plasmodium falciparum can determine the progression of malaria disease. However, quantitative evidence of tolerance is still limited. We investigated variations in the adverse impact of P. falciparum infections among African pregnant women under different intensities of malari...

Diversidade genética de plasmodium falciparsum em amostras de crianças menores de 5 anos de dois distritos de Moçambique
genetic diversity of plasmodium falciparsum in samples from children under 5 from two districts in Mozambique

A diversidade genética do Plasmodium falciparum é um dos maiores obstáculos para o desenvolvimento da imunidade assim como para a eficácia terapêutica de antimaláricos, pois confere ao parasita habilidade para evadir a resposta imune do hospedeiro, gerando mudanças na sua composição antigénica,...

Changing Trends in P. falciparum Burden, Immunity, and Disease in Pregnancy

N. Engl. j. med; (), 2015
Background: Prevention of reinfection and resurgence is an integral component of the goal to eradicate malaria. However, the adverse effects of malaria resurgences are not known. Methods: We assessed the prevalence of Plasmodium falciparum infection among 1819 Mozambican women who delivered infants betwe...

IgG against Plasmodium falciparum variant surface antigens and growth inhibitory antibodies in Mozambican children receiving intermittent preventive treatment with sulfadoxine-pyrimethamine

Immunobiology (1979); 216 (7), 2011
This study aimed to evaluate whether intermittent preventive treatment in infants with sulfadoxine-pyrimethamine (IPTi-SP) had an effect on the acquisition of IgG against Plasmodium falciparum variant surface antigens (VSA) and growth-inhibitory antibodies in Manhiça, Mozambique. In addition, we assesse...

Prozone in malaria rapid diagnostics tests: how many cases are missed?

Malar. j. (Online); 10 (166), 2011
Background: Prozone means false-negative or false-low results in antigen-antibody reactions, due to an excess of either antigen or antibody. The present study prospectively assessed its frequency for malaria rapid diagnostic tests (RDTs) and Plasmodium falciparum samples in an endemic field setting. Met...

Impact of intermittent preventive treatment with sulfadoxine-pyrimethamine on antibody responses to erythrocytic-stage Plasmodium falciparum antigens in infants in Mozambique

Clin. vaccine immunol; 15 (8), 2008
We evaluated the impact of intermittent preventive treatment in infants (IPTi) with sulfadoxine-pyrimethamine (SP), which was given at ages 3, 4, and 9 months through the Expanded Program on Immunization (EPI), on the development of antibody responses to Plasmodium falciparum in Mozambique. Immunoglobuli...

Safety of the RTS, S/AS02D candidate malaria vaccine in infants living in a highly endemic area of Mozambique: a double blind randomised controlled phase I/IIb trial

Lancet; 370 (9598), 2007
Background: Malaria remains a leading global health problem that requires the improved use of existing interventions and the accelerated development of new control methods. We aimed to assess the safety, immunogenicity, and initial efficacy of the malaria vaccine RTS,S/AS02D in infants in Africa. Methods...

AAge interactions in the development of naturally acquired immunity to plasmodium falciparum and its clinical presentation

PloS med; 4 (7), 2007
Background Naturally acquired malaria immunity has many determinants and, in the absence of immunological markers of protection, studies assessing malaria incidence through clinical endpoints remain an approach to defining immunity acquisition. We investigated the role of age in disease incidence and th...