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Query: UMLS:C0024530 (malaria)
 44,886 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

In Solomon Islands, filariasis is caused by the nocturnally perodic form of Wuchereria bancrofti and is transmitted by the same vectors of malaria. This study explores the control of this disease as an additional effect of the Malaria Eradication Programme.
Southeast Asian J Trop Med Public Health 1975 Sep
PMID:Vector control of filariasis in the Solomon Islands. 0 55

The primary objective of this project was to study the life cycle and ecology of Plasmodium pitheci, a malaria parasite of the orang-utan. The field work was based on the orang-utan rehabilitation centre in the Sepilok Forest Reserve of eastern Sabah. Two visits were made to Sepilok, the first in February and March, 1972, and the second (by W.P.) in January 1974. On the first visit two species of "surrogate host" were taken to Sabah, i.e. chimpanzees and Aotus monkeys for experimental work. The arboreal habitat of the orang-utan in the dipterocarp forests of eastern Sabah is described. In the Sepilok Forest Reserve dwell gibbons and leaf-monkeys, in addition to a small population of semi-domesticated and wild, free-ranging orang-utans of various ages. Although numerous species of anopheline mosquitoes have been collected in eastern Sabah, longitudinal studies are not available. Anopheles balabacensis was caught both attracted to orang-utans and to man at Sepilok. This species which is the main vector of human malaria in the north of Borneo, is suspected also of transmitting orang-utan malaria in this part of Sabah. Repeated blood examinations have been made on a number of orang-utans in the centre since 1966 and a high prevalence of infection was recorded with Plasmodium pitheci. In 1966 10 out of 19 animals had demonstrable parasitaemia. Detailed case histories are presented to show the course of parasitaemia in several orang-utans. Infections of P. pitheci were found to run a very chronic course. During the 1972 expedition a second, previously undescribed malaria parasite of the orang-utan was discovered, and was named P. silvaticum. The new parasite was successfully transmitted both by blood inoculation and, later, by sporozoite inoculation, into splenectomized chimpanzees. Although both species of malaria parasite may cause transitory signs of illness, orang-utans in general appear to be little discomforted by the infection. The animals do however suffer from other infectious diseases such as amoebic and balantidial dysentery, and melioidosis is a serious natural hazard which may have accounted for several deaths of wild orang-utans. An unidentified, intraerythrocytic structure that appeared in the blood of one chimpanzee, which had been inoculated with blood from an orang-utan, may have contributed to its death. Detailed descriptions and illustrations of P. pitheci and P. silvaticum are given. All stages of the life cycle of P. silvaticum are known (the tissue stages having been described in the liver of a "surrogate host", the chimpanzee) but only the blood and sporogonic stages of P. pitheci have been seen. This species was not infective to a chimpanzee, although there is an earlier report of a transient infection in this host by other workers. In the blood both parasites showed a tertian periodicity. From the appearance of the tissue schizonts on the seventh day it was estimated that the complete pre-erythrocytic cycle of P. silvaticum in the chimpanzee would occupy 8 days. P...
Philos Trans R Soc Lond B Biol Sci 1976 Sep 28
PMID:Malaria of the orang-utan (Pongo pygmaeus) in Borneo. 1 May 89

Malaria in the Republic of the Philippines is caused principally by P. falciparum and P. vivax, with the former as predominant species. P. malariae is occasionally reported, while P. ovale is very rare and has been reported only in the island of Palawan. Malaria is widespread in distribution with prevalence varying from one area to the other. In 1970, the malaria morbidity rate was reported to be 77.6 per 100,000 while the mortality rate was 1.8 per 100,000. Case detection activities revealed that, in 1973, the slide parasite rate was 7.2%, the annual parasite index was 6.1% and the annual blood examination rate was 8.4%. The principal vector of malaria in the Philippines is An. minimus flavirostris which breeds in clear, fresh-water streams in foothills and mountain slopes. An. mangyanus and An. maculatus appear to play a secondary role. The vectorial capacity of the former appears to be confined only where conditions are primitive, while the latter is associated with malaria transmission in high altitudes. In the absence of fresh-water streams, the salt-water breeder mosquito, An. litoralis, assumes the vectorial role. The epidemiology of malaria in the Philippines is discussed. Emergence of strains of P. falciparum with diminished sensitivity to the commonly used antimalarial drugs is reported in Palawan and Rizal provinces. The development of malaria control activities in the Philippines are presented. As of 1972, Cagayan Valley, Palawan, Mindoro, Sulu and circumscribed areas in Mindanao are still considered hard-core malarious areas with on-going persistent transmission.
Acta Trop 1977 Sep
PMID:Malaria in the Republic of the Philippines. A review. 2 58

Serum-IgM is always abnormally high in tropical splenomegaly syndrome. It is postulated that patients with this disease have an abnormal immunoglobulin response to malaria because they lack effective T suppressor cells. This defect may be genetically determined, thus explaining the tribal and familial aggregation of the disease. Hypermacroglobulinaemia is associated with the formation of large amounts of high-molecular-weight immune complexes. These complexes are important in the pathogenesis of the clinical features of the syndrome.
Lancet 1976 Sep 18
PMID:A suppressor T-cell defect in tropical splenomegaly syndrome. 6 46

Protective immunity against Plasmodium falciparum develops only after several years of repeated exposure to the malarial parasite. We therefore investigated the possibility that acute malaria was associated with malarial antigen-specific immunosuppression. Peripheral lymphocytes of West Africans with and without P. falciparum infections were tested for their in vitro proliferative responses to a preparation of P. falciparum antigen. There was no significant difference between the magnitude of the proliferative response of lymphocytes from infected as compared to normal Africans, although the responses from both African groups were significantly higher than responses from a group of European controls. Furthermore, no soluble inhibitor of antigen-specific proliferation was present in plasma of infected patients. These observations strongly suggest that if the sluggish development of protective immunity in malaria is based upon infection-related immunosuppression, this occurs without affecting the proliferative responsiveness of specific sensitized, circulating T cells. Preliminary observations also indicate that Europeans residing in Africa and taking malaria prophylaxis may acquire sensitized T cells without experiencing clinically apparent infections.
Clin Exp Immunol 1977 Sep
PMID:Malaria antigen-specific T-cell responsiveness during infection with Plasmodium falciparum. 7 36

Owl monkeys (Aotus trivirgatus griseimembra) were effectively immunized against a human malaria parasite, Plasmodium falciparum. Two injections of antigen, primarily mature segmenters with fully developed merozoites, mixed with adjuvant (6-O-stearoyl-N-acetylmuramyl-L-alanyl-D-isoglutamine and liposomes) were administered intramuscularly at a 4-week interval. Approximately 2 weeks after the second vaccination, the monkeys were challenged with the homologous strain of P. falciparum. All immunized monkeys survived the challenge. The substitution of Freund's complete adjuvant is an encouraging step toward the development of an effective and safe vaccine for human malaria.
Science 1978 Sep 29
PMID:Vaccination of experimental monkeys against Plasmodium falciparum: a possible safe adjuvant. 9 14

Antibody formation, endotoxin sensitivity, and resistance to a challenge malarial infection were evaluated in mice fed a diet containing polychlorinated biphenyl (PCB) (Aroclor 1242) or hexachlorobenzene (HCB). Antibody synthesis to the antigen sheep RBC (SRBC) was significantly depressed in the PCB- and HCB-treated (167 ppm) animals as evidenced by the fact that control mice elicited an approximate twofold increase in antibody formation over the chemical-treated mice. Serum IgA concentrations in the PCB- and HCB-treated mice were consistently 40--80 mg/dl lower than control values. Gram-negative endotoxin (Salmonella typhosa) sensitivity in PCB- and HCB-treated mice was increased 5.2- and 32-fold, respectively, following the dietary administration of 167 ppm of Aroclor 1242 or HCB for 6 weeks. An endotoxin hypersusceptibility was also noted at 3 weeks after dietary administration. Decreased resistance to a malaria challenge was also demonstrated in the xenobiotic-treated mice. A 20% decrease in mean survival time of mice fed Aroclor 1242 for 3 to 6 weeks and inoculated with Plasmodium berghei (NYU-2) was observed. Infected mice which had received HCB for 3 or 6 weeks manifested reductions in mean survival time of 24 and 31%, respectively. The data indicated that environmental chemical contaminants impair host resistance and, since no concomitant histopathological alterations were observed in the treated mice, the evaluation of immune parameters may possibly be a sensitive indicator of toxicity.
Ecotoxicol Environ Saf 1978 Sep
PMID:Environmental chemical-induced immune dysfunction. 10 6

Untreated malaria for more than 4 days in eleven patients decreased significantly prealbumin, transferrin levels and increased SGOT activity when compared with a control group and a group of 10 malaria patients who were admitted to the hospital at an earlier stage of the infection. Total protein was significantly lower in the group of patients admitted after five to ten days to hospital compared with the control group. In all malaria patients independent of the duration of the acute infection the 1st post albumin peak in polyacrylamide gel electrophoresis (consisting mainly of Gc-globulin, alpha-1-antichymotrypsin and alpha-1 B-glycoprotein) and creatinine were found to be significantly higher compared with the control group.
Tropenmed Parasitol 1977 Sep
PMID:Alterations of human serum proteins and other biochemical parameters after five to ten days of untreated acute falciparum malaria. 33 73

In recent years there has been an increase in imported tropical diseases in Switzerland. Travellers to the tropics are often inadequately or not at all informed about the dangers and possible prophylaxis of infection. This is true for malaria, of which 207 cases covering the years 1974 to 1976 are studied. Most involved were people between 21 and 30 years old. The main infections (71%) come from African countries. Plasmodium falciparum was found somewhat more frequently than P. vivax. Only a seventh of those infected took chemoprophylaxis regularly. Very many took irregular prophylaxis, while scarcely a third ever took an antimalarial drug. All the severe cases were in this group. A review is conducted of aspects of malaria in Switzerland, a country where the disease is not endemic. However, as it can be brought in at any time from tropical areas, it must be considered in the diagnosis of various clinical pictures. As the characteristic course of the fever is rare and onset of the disease often follows later than a month after the return from the infection area, malaria is only recognized late. The diagnosis is nevertheless relatively easy if the possibility of malaria is borne in mind.
Schweiz Med Wochenschr 1978 Sep 30
PMID:[Malaria introduced into Switzerland from 1974-1976]. 36 Mar 80

To reduce the number of avoidable deaths from malaria in Britain the following five points are recommended. Parliament should pass a Malaria Prevention Act that compels travel agents and airlines to give written and verbal advice on prevention and diagnosis of malaria to people travelling to countries where the disease occurs. To improve diagnostic and therapeutic efficiency for all diseases the Department of Health and Social Security should prepare a procedure manual for the NHS that gives guidance for doctors and other medical staff. Avoidable deaths from all diseases should be the subject of open inquiries at district medical committees, with recorded evidence. Failure to perform diagnostic tests such as blood films for malaria in cases of sickness in people returning from the tropics should automatically be considered negligent. Compensation should be offered by the State to the next of kin of people who have died because of medical negligence from malaria or other diseases.
Br Med J 1978 Sep 23
PMID:Preventing deaths from malaria. 36 Nov 51


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