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)

Ninety-nine consecutive patients who received cytotoxic therapy for acute leukemia were retrospectively studied to determine the pattern of infection at the Tata Memorial Hospital, Bombay, India. In all, 224 infective episodes occurred in these patients. Bacterial infection was the commonest type, accounting for 152 (67.9%) of 224 infective episodes, followed by fungal and viral infections (15.6% and 14.3%, respectively). Gram-negative organisms (Pseudomonas and Klebsiella) were the commonest bacterial organisms isolated, constituting 38 (76%) of 50 positive cultures; infection with Staphylococcus was rare (10%). Infective hepatitis, malaria, and systemic tuberculosis were responsible for fever with neutropenia in 20, 4, and 2 patients, respectively. Three hundred fifty-two patients with lymphoproliferative malignancies were also retrospectively studied to determine the pattern of infection. Only 53 infective episodes were recorded. In these patients, in contrast to those with acute leukemia, viral infection (33 [62.3%] of 53) and pulmonary tuberculosis (18 [34%] of 53) were frequently seen. It is interesting that 50% of our patients with hairy cell leukemia also had tuberculosis. Bacterial infection was conspicuous by its absence. Knowledge of the prevailing pattern of infection permits the development of investigative and therapeutic approaches of optimal efficacy.
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PMID:Pattern of infection in hematologic malignancies: an Indian experience. 260 80

In this paper, the effects of recombinant human interleukin-1 (IL-1) on non-specific resistance to infection are reviewed. In experiments in neutropenic mice, a single injection of a low dose of IL-1 (8-800 ng) appears to protect against death from lethal Pseudomonas aeruginosa and Candida albicans infections. In non-neutropenic mice protection can also be obtained with such dosages of IL-1 in infection caused by Klebsiella pneumoniae or Listeria monocytogenes. Low dosages of IL-1 are also able to prevent lethal cerebral malaria in mice. No effect has been found in murine cytomegalovirus infection. With the exception of C. albicans infection and malaria, protection is only obtained if IL-1 is given before the infection. The mechanism of protection has not been elucidated; in the Pseudomonas and Klebsiella infection, it could be demonstrated that survival was not due to a direct antibacterial effect of IL-1, not due to the action of granulocytes or increased hematopoietic recovery and not due to activation of macrophages and increased bactericidal mechanisms. In the experimental Listeria infection however, animals treated with IL-1 had lower bacterial counts in their organs. Since the cytokines interleukin-6 (IL-6) and tumor necrosis factor (TNF) are much less potent than IL-1 in these protection experiments, it is very unlikely that they are endogenous mediators of the protection induced by IL-1. The effect is not mediated via the cyclooxygenase pathway, since premedication with ibuprofen does not influence the protective effect of IL-1. Taking these data together, it is felt that IL-1 holds promise as a therapeutic agent in humans.
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PMID:Options for the treatment of serious infections with interleukin-1. 270 46

In three studies, in Ghana and Kenya, blood from 639 patients admitted with fever was cultured. Standard treatments were antimalarials (54-100%) and antibiotics (39-90%). According to the criteria in use, however, only 10-31% had malaria alone; of those who received antibiotics, 66% were diagnosed with malaria, gastrointestinal infections, post-operative recuperations, circulatory problems, central nervous system disorders or FUO, and did not need antibiotics at the first encounter. For those with wounds and abscesses (8%), generalised antibiotic treatment can also be questioned. Bacteraemia was found in 71 (11.3%) patients; in the HIV patients, however, 5 (23%) of 22 had bacteraemia. This is a minimum incidence, since culture techniques were not optimal for the isolation of fastidious microorganisms. The most prevalent organisms isolated were Salmonella, Klebsiella/Enterobacter and S. aureus. Resistance (intrinsic and extrinsic) in the Gram- bacteria was high: 31-100% were resistant to amoxycillin, 0-80% to cotrimoxazole, 15-95% to chloramphenicol and 9-15% to gentamicin. The need for cultures and sensitivity tests for patients with prolonged or undiagnosed fever is stressed. Specific treatment should be given only when infections, whether malarial or bacterial, have been positively diagnosed.
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PMID:Bacteraemia in patients presenting with fever. 779 50

We prospectively studied the demographics, the clinical and diagnostic features, the HIV-1 serostatus and the therapeutic response for all new patients with septic arthritis (SA) admitted to the Department of Internal Medicine of the Centre Hospitalier de Kigali, Rwanda, over a 19 month period. SA was diagnosed in 24 patients (10 male, 14 female), of whom 19 (79%) were HIV-1 seropositive (HIVpos). Gonococcal arthritis was found in four patients, all HIVpos. Non-gonococcal bacterial arthritis was established in 16 patients, of whom 13 were HIVpos. Causative organisms involved in this group and the corresponding HIV-1 serostatus of the patients were: Staphylococcus aureus: 4; 2 HIVpos. 2 HIVneg: Streptococcus pneumoniae: 4; 4 HIVpos; Salmonella group B: 2; 2 HIVpos; Streptococcus group D: 1; 1 HIVpos; Klebsiella pneumoniae: 1; 1 HIVpos; undetermined: 4; 3 HIVpos; 1 HIVneg. Tuberculous arthritis was presumed in four patients, of whom two were HIVpos. HIV-1-associated SA had a classical acute presentation and an overall good prognosis Compared to a control group consisting of hospitalized patients with malaria as the sole diagnosis, patients with SA were more likely to be infected with HIV-1 (P = 0.005, or 6.3; 95% CI 1.7 22.2). Prevalence rate estimates of SA among HIVpos and HIVneg patients were 0.5 and 0.25%, respectively (P = 0.38). We conclude that HIV-1 infection appears as a risk factor for SA among patients hospitalized at the Centre Hospitalier de Kigali, but that SA cannot be used as a predictor for HIV-1 infection for hospitalized patients. SA occurs infrequently and may present at any stage of HIV-1 infection.
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PMID:HIV infection as a risk factor for septic arthritis. 913 65

A protocol was developed for significantly reducing resident midgut bacteria in newly emerged anopheline mosquitoes using a combination of antibiotics. Pupa harvested from colony-reared Anopheles gambiae s.l. Giles and Anopheles stephensi (Liston) were placed in cages wiped previously with 70% alcohol and kept under UV light for 24 h. Emerging adult mosquitoes were fed for 3 consecutive days on antibiotic solution, consisting of 0.4% gentamicin sulfate and 1% penicillin-streptomycin solution in a 10% sterile sucrose solution. Bacterial suspensions of Escherichia coli, Klebsiella pneumoniae (Schroeter, 1886), and Pseudomonas stutzeri (Lehmann & Neumann, 1896) isolated from wild-caught anophelines were fed to antibiotic-treated mosquitoes starved for 24 h via either sugar or membrane-feeding. Mosquitoes dissected 1 and 24 h after blood-feeding or sugar-feeding, and plated on trypticase soy agar plates, yielded the same type of bacteria fed originally without evidence of contaminants. There was no residual effect of the antibiotics on introduced single bacteria strains as judged by the presence of bacteria in antibiotic-treated mosquitoes. This experimental reduction of resident midgut bacteria and their replacement with single strains in newly emerged anopheline mosquitoes should facilitate further investigations of the interactions between malaria parasites and bacteria found in the midguts of mosquitoes.
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PMID:Bactericidal effects of sugar-fed antibiotics on resident midgut bacteria of newly emerged anopheline mosquitoes (Diptera: Culicidae). 1073 Apr 95

beta Androstenes steroid up-regulates immunity to increase resistance against lethal infection and lethal radiation, and mediates a rapid recovery of hematopoietic precursor cells after radiation injury. beta Androstenetriol increases the levels of the TH(1) cytokines, IL-2, IL-3, IFN gamma and counteracts hydrocortisone mediated immune suppression. In contrast, 17 alpha androstenediol inhibits proliferation and mediates apoptosis in tumor cells of murine and human origin. Its epimer 17beta androstenediol does not. The antiproliferative functions of 17 alpha androstenediol are not dependent on either the estrogen or androgen receptors. Our findings show that beta androstenes and analogs protect the host from lethal infection by DNA or RNA viruses such as, herpesvirus type 2, coxsackievirus B4, influenza, and arthropod borne viruses. These androstenes also protected the host from lethal bacterial infections by Enterococcus faecalis, Pseudomonas aeruginosa, and Klebsiella pneumonia and from parasites infections, i.e. Cryptosporidium parvum, and malaria. In vivo, the level of potency follows the order: dehydroepiandrosterone<<<androstenediol<androstenetriol with the latter being up to one hundred thousand times more potent in protecting the host from infections than the first. In vitro, their effects are also dramatically different from one another with only beta androstenetriol potentiating the cellular response by increasing lymphocyte activation and counteracting hydrocortisone immune-suppressive activity. Conceptually, the androstenes form a new and different subclass of steroid hormones with unique physiological properties. Following host injury, the balance between the epimers and isomers is a determining factor in the overall regulation of hematopoiesis, TH(l)/TH(2) balance, and host resistance to infections and tumor growth.
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PMID:Immune up-regulation and tumor apoptosis by androstene steroids. 1239 92

In the tropics, febrile illnesses are often presumed to be due to malaria, because of its endemicity, and treatment can lead to delay in diagnosis or failure to detect severe infections such as bacteraemia. This study sought to determine the prevalence of bacteraemia and malaria parasitaemia in febrile post-neonatal infants (age 1-12 months) at the University College Hospital, Ibadan, Nigeria, and the bacterial aetiological agents of bacteraemia in the infants. Therefore, 102 infants aged 1-12 months who presented with fever with a negative history of antimicrobial use in the week prior to presentation were evaluated and had blood cultures done for the detection of aerobic organisms by standard methods and blood films for malaria parasites. Bacteraemia was found in 38.2% of the infants, malaria parasitaemia was found in 46.1%. The most common organisms isolated were Escherichia coli (35.9%), Staphylococcus aureus (33.3%) and Klebsiella spp. (10.3%). Febrile children should be investigated for the presence of bacterial infection even if the blood film for malaria parasites is positive. Where laboratory facilities are not available, consideration should be given to the use of both anti-malarial therapy and empiric antibiotic therapy in the management of febrile infants, depending on the clinician's judgement.
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PMID:Concurrent bacteraemia and malaria in febrile Nigerian infants. 1571 44

The prevalence of malaria parasitemia, bacteremia, certain hematological parameters, leucocyte migration index and nitroblue tetrazolium dye reduction were determined in 147 Nigerian children (4.24+/-2.88 years of age). Sixty (40.8%), 28(19.1%) and 26(17.7%) had malaria parasitemia only, bacteremia only and both malaria parasitemia and bacteremia, respectively. Four genera of bacteria, i.e E. coli, Proteus, Staphylococcus and Salmonella, were detected in subjects with both malaria parasitemia and bacteremia. The 4 bacterial genera and Klebsiella were detected in subjects with bacterial infection only. P. falciparum (68%), P. malariae (25%) and P. ovale (7%) were the species of malaria parasites identified in our subjects. Bacteremia was most prevalent in subjects with hemoglobin AA (HbAA) (60.7%) followed by HbAC (21.45%). Packed cell volume (PCV) and Hb concentration were similar in all groups but mean counts of red blood cells (RBC) and white blood cells (WBC) were statistically significantly lower in subjects with malaria parasites only compared to the controls. Leucocyte migration was significantly reduced in children with bacteremia only or both malaria parasitemia and bacteremia compared to controls, while the nitroblue tetrazolium assay was significantly reduced in children with bacteremia only. It may be concluded that malaria parasitemia significantly affects both leucocyte migration and nitroblue tetrazolium assay.
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PMID:Leucocyte migration and nitroblue tetrazolium assay in Nigerian children with bacteremia and malaria parasitemia. 1578 34

The presence of concomitant bacteria was assessed in the blood of 125 malaria positive patients and 60 malaria negative controls, resident in Owerri, southeastern Nigeria. Blood samples were cultured in MacConkey, Chocolate and Blood agar, respectively using oxoid signal system after the manufacturer's instructions. Blood cultures of 44 (35.2%) of the 125 malaria positive patients had bacterial growth while none was observed in the blood cultures of malaria negative patients. The bacteria species identified included: Staphylococcus aureus 4 (3.2%), Escherichia coli 3 (2.4%) Salmonella typhi 25 (20%), Klebsiella pneumoniae 10 (2.4%) and Pseudomonas aeruginosa 2 (1.6%). The presence of concomitant bacteria in malaria-positive cases usually results in persistence of malaria-like symptoms after treatment with antimalarials and subsequently taken as resistance of the parasites to the particular drugs in question. The significance of concomitant bacteria in the management of malaria should be given priority.
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PMID:Concomitant bacteria in the blood of malaria patients in Owerri, southeastern Nigeria. 1825 13

Scorpine is an antimicrobial peptide whose structure resembles a hybrid between a defensin and a cecropin. It exhibits antibacterial activity and inhibits the sporogonic development of parasites responsible for murine malaria. In this communication we report the production of scorpine in a heterelogous system, using a specific vector containing its cloned gene. The recombinantly expressed scorpine (RScp) in (Anopheles gambie) cells showed antibacterial activity against (Bacillus subtilis) and (Klebsiella pneumoniae), at 5 and 10 microM, respectively. It also produced 98% mortality in sexual stages of (Plasmodium berghei) at 15 microM and 100% reduction in (Plasmodium falciparum) parasitemia at 5 microM. RScp also inhibited virus dengue-2 replication in C6/36 mosquito cells. In addition, we generated viable and fertile transgenic (Drosophila) that overexpresses and correctly secretes RScp into the insect hemolymph, suggesting that the generation of transgenic mosquitoes resistant to different pathogens may be viable.
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PMID:Recombinant scorpine: a multifunctional antimicrobial peptide with activity against different pathogens. 1872 72


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