Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0024530 (malaria)
 44,886 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Field tests were conducted in the Grande Comore Island, Federal Islamic Republic of Comoros, in order to evaluate the potential of the larvivorous fish Poecilia reticulata for the control of the malaria vector Anopheles gambiae s.s. Due to the high permeability of soil, Anopheles breeding sites in all island occurs only in the man-made water reservoirs. The study was carried out from November 1987 to November 1988 within a framework of a malaria and filariasis control programme, supported by WHO and UNDP in collaboration with the Government of the FIR of Comoros. All larval breeding places of An. gambiae existing in the village of Hantsambou were recorded (59 ablutions basins and 61 cisterns) and provided initially with 3-5 specimens of P. reticulata/m3 in November 1987, after the importation of the larvivorous species from Mayotte Island. The percentage of breeding places positive for An. gambiae decreased from 41% to 6% after one year. Pyrethrum spray catch showed a reduction of indoor resting density from 5.5 to 0.3, while the ma value, number of Anopheles bites/man/night, obtained by night-biting catches, decreased from 6.3 to 1.2. At the same time of the reduction of entomological indices parasite index for P. falciparum and spleen rate drop steadily in 5-9 years school children. The tested vector control method, well accepted by the community, could be implemented in malaria control through primary health care, being the ecological conditions in the entire island very peculiar.
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PMID:[Impact of the use of larvivorous fish Poecilia reticulata on the transmission of malaria in FIR of Comoros]. 195

The medical importance, ecology and control of riceland mosquitoes using alternative strategies is reviewed. Over 135 pest and vector anopheline and culicine mosquito species found in association with riceland habitats and their medical importance are presented. Malaria and Japanese encephalitis are the two most serious human diseases transmitted by riceland mosquitoes, but they have been incriminated as vectors of dozens of arboviruses and other parasites and pathogens including the causal agents of West Nile and Rift Valley Fevers and lymphatic filariasis. Control of vector and pest mosquitoes using chemical pesticides has generated several problems including: insecticide resistance, safety risks for humans and domestic animals, and other environmental concerns. These problems and the high cost and sustainability of programs based predominantly on conventional insecticides have stimulated increased interest in integrated control measures in ricelands. The integrated pest management (IPM) strategy for mosquito control, also known as integrated vector control (IVC), is an ecologically based approach that may involve several complementary interventions used in combination or singly. Environmental management, and chemical, biological and mechanical control, comprise the elements of IVC proposed for use in or near riceland habitats. Some of the elements of environmental management include the use of intermittent irrigation; flushing of fields; use of rice cultivars that require less water; shifting of planting schedules to avoid optimal mosquito breeding conditions; relocation of communities or use of dry belt farming around them; and zooprophylaxis and other personal protection methods, especially use of insecticide-impregnated bed nets. Biological control agents that have been used successfully in rice fields include several species of larvivorous fish, a mermithid nematode (Romanomermis culicivorax), a fungus (Lagenidium giganteum) and bacteria (Bacillus thuringiensis var. israelensis and Bacillus sphaericus). The mermithid and the entomopathogens have demonstrated little or no adverse effects on populations of vertebrate and invertebrate nontarget organisms. The successful use of any particular method or combination of interventions for the control of riceland mosquitoes will depend on in-depth ecological studies on the target species and nontarget organisms, sound geographic reconnaissance and effective routine sampling and evaluation. When biological control agents are considered, additional background on the environmental factors limiting their efficacy will also be needed. In addition to the technical components of the various interventions employed in integrated control, sustained suppression of riceland mosquitoes and the diseases they transmit will require a greater sociocultural supportive background, particularly in developing countries.(ABSTRACT TRUNCATED AT 400 WORDS)
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PMID:The medical importance of riceland mosquitoes and their control using alternatives to chemical insecticides. 204 5

Field tests were conducted to compare the degree of protection from bites of Mansonia species and Anopheles maculatus by applying two repellent/insecticidal bars, MOSBAR and MOSKIL, to exposed arms and legs. Human test subjects were exposed to natural populations of mosquitos for an 8-hour night time period while using the repellent/insecticidal bars. MOSBAR gave good protection against the bites of Mansonia and An. maculatus. MOSKIL was effective against An. maculatus but not against Mansonia. High mortality was observed among the mosquitos collected from human test subjects treated with the repellent/insecticidal bars. Use of MOSBAR in terms of cost-effectiveness and safety by field and health workers entering into malaria and filariasis endemic areas is discussed.
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PMID:Effectiveness of repellent/insecticidal bars against malaria and filariasis vectors in peninsular Malaysia. 198 29

The health situation in Nigeria is typical of tropical Africa. It is characterised by high childhood and maternal mortality and a relatively short life expectancy. Mortality in childhood in due mainly to diseases like malaria, measles, poliomyelitis, tetanus, diarrhoea and acute respiratory tract infections. Diseases like filariasis, schistosomiasis and leprosy which are now readily controlled by drugs cause considerable morbidity in later life. Although the technology and tools (particularly vaccines and drugs) for the control of most of these diseases are now available, it has not been possible to make optimal use of them in Nigeria and other tropical African countries because of unfavourable social and economic conditions. The non-availability of drugs most needed for healthcare and disease control has been found to be due not only to insufficient funds but also to the use of the limited funds on expensive drugs that have little bearing on the disease pattern. The Essential Drug Programme initiated by the World Health Organisation, now adopted by Nigeria and about 100 other countries mostly in the Third World, aims to correct this unsatisfactory drug supply situation by ensuring that the available funds are used to provide those drugs needed by the large majority of the people and are made available at all times at prices that most people can afford. The Bamako Initiative in the African Region of the World Health Organization is also designed to ensure regular availability of drugs particularly to primary healthcare facilities. Seed drugs are provided to the health institutions either by the National Government or through external aid. These are sold to patients at a small profit margin. The proceeds are then used to replenish stocks and the small profit used to improve services in the health centre. The introduction of these programmes in Nigeria has improved drug availability considerably in the past couple of years and should soon start yielding further dividend in the form of measurable improvement in the health situation.
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PMID:Drug supply in Nigeria. 204 36

The impact of untreated bed nets on the transmission of human malaria and filariasis in a village in a hyperendemic area of Papua New Guinea was studied. In anopheline mosquitoes, the Plasmodium falciparum sporozoite antigen positivity rate, filarial infection rates and human blood indices dropped significantly after bed nets were introduced. This reduction in human-vector contact did not affect mosquito density as no significant difference in either landing rates or indoor resting catches was found. The number of bed nets in a house and ownership of dogs were factors significantly associated with a reduction in the number of indoor resting mosquitoes. However, the reduction in the P. falciparum sporozoite antigen rate in mosquitoes was not accompanied by a reduction in either malaria parasite or antibody prevalences or titres against the P. falciparum circumsporozoite protein.
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PMID:Effects of untreated bed nets on the transmission of Plasmodium falciparum, P. vivax and Wuchereria bancrofti in Papua New Guinea. 209 2

We have expressed two cDNA sequences encoding 121 and 230 amino acids of the C-terminus of the Schistosoma mansoni Hsp 70 in Escherichia coli. The products were synthesized as polypeptides fused to the RNA polymerase of bacteriophage MS2, and their reactivities were tested in ELISAs, using sera from human and murine infections. Anti-Hsp70 antibodies were detected in a significant number of individuals suffering from chronic schistosomiasis mansoni, but not in patients with known recent infections. This, together with the finding that antibodies directed at S. mansoni-specific Hsp70 determinants during the course of infection of experimental mice were not detectable until 5-6 weeks post-infection, suggests that the protein may be a useful marker for distinguishing late and early infections. The diagnostic specificity of Hsp70 was evaluated with sera from humans infected with different schistosome species and other parasitic diseases. While some subjects infected with S. haematobium produced antibodies which recognized the S. mansoni Hsp70, no such antibodies were generated in S. japonicum infected individuals. However, cross-reactive antibodies were elicited in donors with other parasitic diseases such as filariasis and malaria. The absence of antibodies in early infection and the observed cross-reactivities led us to conclude that Hsp70 will be of limited value in the diagnosis of schistosomiasis.
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PMID:The humoral response to heat shock protein 70 in human and murine Schistosomiasis mansoni. 211 91

The literature on health implications and effects of government-sponsored resettlement in Ethiopia is reviewed with the objective of providing an initial evaluation of the health status of settlers and the health hazards of resettlement in western Ethiopia. Emphasis is on the 1984/85 resettlement program, which resulted in the movement of about 600,000 drought victims from northern and central Ethiopia to the western part of the country. Malaria, trypanosomiasis, onchocerciasis, yellow fever, nonfilarial elephantiasis, sand-flea infestation, and psychological stress are identified as immediate and greater health hazards than in the areas of settler origin, based on the geographic distribution and ecology of the major communicable, nutritional, and geochemical diseases in Ethiopia, and on the impact of program deficiencies on settler health. More studies are needed on the epidemiology and ecology of bancroftian filariasis, visceral leishmaniasis, dracunculiasis, eye and skin diseases, tuberculosis, meningitis, intestinal parasitism, diarrhea, and calorie/protein malnutrition before their public health and economic significance in settlements can be evaluated. Schistosomiasis appears to be less common, for the time being, in resettlement areas than in the areas of outmigration. Research needs and constraints in resettlement planning, implementation, and operation are identified, and some recommendations made for disease control programs.
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PMID:Health aspects of resettlement in Ethiopia. 218 82

This paper is a review of the interactions between agriculture and vector borne diseases. Rain forest clearing makes possible the development of heliophilous species of anophelines and snails leading to an increase of malaria and schistosomiasis in Africa. But in Asia, clearing is a control method against Anopheles balabacensis, an important malaria vector. Clearing of forest galleries is followed by the disappearance of shore-dwelling tsetse flies. Woodcutters and pioneer farmers are contaminated with arbovirus and leishmaniasis when entering in natural sylvatic foci of these diseases. Management of drinking water reduces guinea worm as well as cholera and other diarrhoeal diseases. More over when piped water becomes available people are no more obliged to store drinking water in containers where vectors use to breed. Reservoirs of dams offer large possibilities for the development of mosquitoes including anophelines vectors of malaria and filariasis and of snails hosts of schistosomiasis. The medical importance of these man-made breeding sites depends of the local epidemiological features of the diseases. Dam spillways provide breeding for blackflies and man-made foci of onchocerciasis have been described in West Africa. Irrigation channels mainly when non cleared of vegetation are good breeding places for anophelines and snails. Irrigated surfaces like rice fields are highly productive in anophelines and other dangerous species of Culicinae. Insecticides used in agriculture, mainly to control cotton and rice pests, have been at the origin of insecticide resistance of several anopheline species. On an other hand, sometimes rice pests control lead to the control of rice field mosquitoes until they become resistant, e.g. for Culex tritaeniorhynchus the vector of Japanese encephalitis in South Korea. Many international organizations have emphasized the role of intersectorial collaboration to control man-made vector borne diseases foci. Good planning of the infrastructures (e.g. twin spillways) and adequate maintenance are essential. Vector control in rice field is a puzzling question. Wet irrigation was a hope but it cannot be done everywhere. Biological control methods have not been proven to be very efficient. Even Bacillus thuringiensis H14 and B. sphaericus have severe limitation. New tools for intersectorial activities should be a goal for scientists imagination.
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PMID:[Agriculture-health interface in the field of epidemiology of vector-borne diseases and the control of vectors]. 220 69

The effects of a well-spaced diethylcarbamazine (DEC) mass drug application in areas highly endemic for Wuchereria bancrofti in Papua New Guinea are not known. In 1986 a semi-annual single-dose 6 mg/kg body weight administration of DEC was initiated in the Ok Tedi area of Western Province, Papua New Guinea. The rate of bancroftian filariasis in the area was 39%. Within two years the rate of detectable microfilaraemia was reduced from 31% to 11% in the treated group. The mean blood density of the parasite was reduced from 79 to 19 microfilariae per 20 microliters. A survey of untreated villages in the immediate area (not surveyed before 1988) showed a filariasis rate of 39%. A 14-fold difference in the total microfilaraemia count was noted between the two groups when 1988 data were compared. A reduction in the annual rate of filariasis may be monitored through a well-established passive case detection program for malaria. The DEC treatment program was well accepted despite side-effects encountered in 20% of the treated population early on in the program. The success of the 2-year Phase 1 program has expanded into an annual single-dose administration of DEC over a larger area.
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PMID:Diethylcarbamazine in the control of bancroftian filariasis in the highly endemic Ok Tedi area of Papua New Guinea: phase 1. 223 34

The filarial-specific humoral immune response of adult residents of two areas of Papua New Guinea, differing in transmission of Wuchereria bancrofti infection was compared. The majority of residents of the village of Bonahoi, in an area where transmission of filariasis had been interrupted by a 20-year insecticide spray program to control malaria, showed no parasitologic signs of active W. bancrofti infection and were negative for both circulating phosphorylcholine Ag and peripheral blood microfilariae. In contrast, adult residents of the village of Nanaha were in an area exposed to infection, and were phosphorylcholine-Ag- and microfilariae-positive. The antibody response of these two groups to both adult worm excretory/secretory (ES) Ag and somatic antigen extract was examined to determine which components of the filarial-specific immune response were dependent on active infection. Identification of these immune responses may point to immunologic methods to evaluate control programs for lymphatic filariasis. Adults from Bonahoi were found to have significant immune responses to [35S] methionine-labeled ES Ag by immunoprecipitation and to adult somatic antigen extracts by ELISA and by immunoblotting. This result is consistent with the fact that these individuals were previously exposed to and/or infected with W. bancrofti. Similarly, residents of the endemic village had detectable immune responses to these Ag irrespective of if they were microfilaremic. The most striking immunologic difference observed between the two groups was that residents of Bonahoi had a dramatically reduced filarial-specific IgG4 antibody response to both adult somatic Ag and adult ES Ag. These data suggest that longitudinal measurement of filarial-specific IgG4 levels may be a useful seroepidemiologic indicator of changes in W. bancrofti infection status.
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PMID:Filarial-specific IgG4 response correlates with active Wuchereria bancrofti infection. 225 18


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