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

A transversal investigation carried out on 551 children and a longitudinal study of 55 infants showed the disappearance of maternal anti-plasmodium antibodies during the first year of life. Out of 212 new-borns surveyed for one year, 59 (28%) were infested by Plasmodium, but never during the first two months of life. This infestation was not related to the age of the infant nor to the season. For 46% of cases, infestation was completely asymptomatic, for 18% of cases respiratory signs were present and for 20% digestive signs not specific to malaria. Fever was present in 14 cases (24%) and isolated in 6 cases. Only 7 infants received a specific antimalarial treatment. Evolution under medical surveillance was favourable in all cases. These findings prove the difficulties inherent to the diagnosis of malaria, especially in the absence of laboratories for diagnosing other infections--such as typhoid--which do not appear in sanitary statistics. The findings also raise the question as to the efficiency of systematic antimalarial treatment in case of fever in the infant or child. Asymptomatic parasitemia can be explained by the existence of antitoxic immunity different from antiplasmodia immunity.
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PMID:[Malaria in infants in a rural area of maritime Guinea (Guinea Conakry). II. Development of antimalarial antibodies and malaria during the first year of life]. 984 19

Eleven patients referred to a hospital in South Africa with suspected tropical diseases such as malaria, typhoid fever and South African tick bite fever were found to be suffering from primary human immunodeficiency virus (HIV) infection. Hospital records were reviewed retrospectively in those acutely ill, febrile patients where a clinical suspicion of HIV seroconversion existed and no other diagnosis could be found. A history of recent travel, particularly to malarious areas, was given by most of these patients. The clinical presentation was dominated by high fevers and headaches. The most helpful pointers to primary HIV infection included a characteristic palatal enanthem, leucopenia and thrombocytopenia. Ironically, the history of recent travel appeared to have confounded the diagnosis despite the fact that travel has often been associated with the acquisition of HIV in Africa. Recognition of primary HIV infection masquerading as a tropical disease may result in more frequent diagnosis of this serious condition.
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PMID:Primary HIV infection diagnosed in South Africa masquerading as another tropical disease. 985 Mar 99

Travelers' immunization has 2 aims: for the traveler, to prevent the risk of contracting an endemic disease during his stay abroad; for the community to prevent the risk of importing an infectious agent yet unknown in the country. Travelling offers an opportunity to update routine immunizations: tetanus, diphtheria, poliomyelitis, hepatitis B; for young people: measles and rubella; for elderly people: influenza. Two vaccinations are compulsory: yellow fever for travelers to tropical Africa and Amazonian forest; meningococcus A + C for Mecca pilgrims. Other vaccines are recommended for travelers to specific areas: typhoid fever, hepatitis A, cholera in countries with poor hygiene; rabies for exposed travelers (expatriates, trekkers...); Japanese encephalitis for persons spending a month or longer in rural agricultural areas during the monsoon season; tickborne encephalitis for persons visiting forested areas of central Europe from may to september. Yet, most of travelers' diseases such as malaria cannot be prevented by vaccination and appropriate preventive measures (chemoprophylaxis and protection against insects) should be taken.
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PMID:[Vaccinations of the traveller]. 985 43

In a combined retrospective and prospective 4-year study of 6412 children consecutively admitted to St Paul's Hospital, Nchelenge, north-east Zambia, the clinical epidemiology of paediatric disease was described. One diagnosis per admission was noted. Protein-energy malnutrition (PEM) was diagnosed clinically and by means of a modified Wellcome scheme using weight-for-height and Z scores. Correlation coefficients were calculated between monthly admission rates and relative humidity, rainfall and temperature. The age distribution of admitted children showed several distinct groups. Type I (malaria, acute gastro-enteritis, pneumonia and meningitis) had its peak in the 1st 7 months of age, type II (burn wounds and measles) had its main prevalence between the ages of 2 and 4 years, and type III (trauma, typhoid fever, snake bite and tropical ulcer) occurred mainly between 4 and 14 years of age. Admission rates for PEM, PEM subtypes, pneumonia, trauma and snake bite correlated with wet season variables. Malaria and acute gastro-enteritis were extremely common throughout the year. A measles epidemic in the dry season was initially followed by an increase in marasmus, whereas oedematous malnutrition only assumed epidemic proportions associated with a post-measles rise in admission rates of pneumonia. Clinical epidemiological data at the district level is a powerful tool for understanding the pattern of serious paediatric disease in the community.
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PMID:Clinical epidemiology of paediatric disease at Nchelenge, north-east Zambia. 992 74

Visceral leishmaniasis, or kala-azar, a fatal tropical disease, remains problematic, as early diagnosis is difficult and treatment often results in drug resistance and relapse. We have developed a sensitive enzyme-linked immunosorbent assay (ELISA), using leishmanial membrane antigenic extracts (LAg) to detect specific antibody responses in 25 untreated Indian visceral leishmaniasis patients. To investigate the pathogenetic significance of isotype markers in kala-azar, relative levels of specific immunoglobulin G (IgG), IgM, IgA, IgE, and IgG subclasses were analyzed under clinically established diseased conditions. Since LAg showed higher sensitivity for specific IgG than lysate, the immunoglobulin isotype responses were evaluated, with LAg as antigen. Compared to 60 controls, which included patients with malaria, tuberculosis, leprosy, and typhoid and healthy subjects, visceral leishmaniasis patients showed significantly higher IgG (100% sensitivity, 85% specificity), IgM (48% sensitivity, 100% specificity), and IgE (44% sensitivity, 98.3% specificity) responses. Low levels of IgA in visceral leishmaniasis patients contrasted with a 13-fold-higher reactivity in sera from patients with leprosy. Among IgG subclasses, IgG1, -3, and -4 responses were significantly higher in visceral leishmaniasis patients than in the controls. IgG2 response, however, was significantly higher (twofold) in leprosy than even visceral leishmaniasis patients. The rank orders for sensitivity (IgG = IgG1 = IgG3 = IgG4 > IgG2 > IgM > IgE > IgA) and specificity (IgM = IgG3 > IgE > IgG4 > IgG2 > IgG > IgG1 > IgA) for LAg-specific antibody responses suggest the potentiality of IgG3 as a diagnostic marker for visceral leishmaniasis.
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PMID:Immunoglobulin subclass distribution and diagnostic value of Leishmania donovani antigen-specific immunoglobulin G3 in Indian kala-azar patients. 1006 59

The Philippines is an archipelago of about 7000 islands, with an area about the size of England, situated just above the equator in Southeast Asia. It has a population of 70 million. The Philippines has had extensive commercial and social contact with Asian neighbors, specifically the Chinese, even before the 377 years of Spanish colonization from 1521 to 1898 and the 48 years of American rule from 1898 to 1946. More than 80% of Filipinos are Catholics; the rest are Muslims and Protestants of various denominations, including those who belong to Filipino church groups. Infectious diseases such as tuberculosis, amoebiasis, typhoid fever, and malaria are still prevalent, and arteriosclerosis, cancer, and stroke are common and on the rise.
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PMID:Surgery in the Philippines. 1008 78

Travel-related infectious diseases are exceedingly common, difficult to diagnose, and sometimes preventable. Vaccination is one tool for reducing the risk of infectious disease for some travelers. Both healthcare providers and travelers need to be aware of the new travel vaccines, and new formulations of older vaccines that now are available. This article presents an update on vaccines for cholera, Japanese encephalitis, rabies, rotavirus, typhoid, and malaria.
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PMID:Travel vaccines. 1019 97

The diagnostic value of an acute-phase single-tube Widal test for suspected typhoid fever was evaluated with 2,000 Vietnamese patients admitted to an infectious disease referral hospital between 1993 and 1998. Test patients had suspected typhoid fever and a blood culture positive for Salmonella typhi (n= 1,400) or Salmonella paratyphi A (n = 45). Control patients had a febrile illness for which another cause was confirmed (malaria [n = 103], dengue [n = 76], or bacteremia due to another microorganism [n = 156] or tetanus (n = 265). An O-agglutinin titer of >/=100 was found in 18% of the febrile controls and 7% of the tetanus patients. Corresponding values for H agglutinins were 8 and 1%, respectively. The O-agglutinin titer was >/=100 in 83% of the blood culture-positive typhoid fever cases, and the H-agglutinin titer was >/=100 in 67%. The disease prevalence in investigated patients in this hospital was 30.8% (95% confidence interval, 26.8 to 35.1%); at this prevalence, an elevated level of H agglutinins gave better positive predictive values for typhoid fever than did O agglutinins. With a cutoff titer of >/=200 for O agglutinin or >/=100 for H agglutinin, the Widal test would diagnose correctly 74% of the blood culture-positive cases of typhoid fever. However, 14% of the positive results would be false-positive, and 10% of the negative results would be false-negative. The Widal test can be helpful in the laboratory diagnosis of typhoid fever in Vietnam if interpreted with care.
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PMID:Value of a single-tube widal test in diagnosis of typhoid fever in Vietnam. 1044 69

Malaria and typhoid fever are endemic diseases in Cameroon, with overlapping signs and symptoms. While the high prevalence of malaria is an established fact, it is only within the past 5 years that an unusually high number of illnesses have been diagnosed as malaria co-existing with typhoid fever. The Widal test is widely used as the sole laboratory test for the diagnosis of typhoid fever. To investigate the extent of the malaria and typhoid fever association, we used blood and stool cultures as additional diagnostic tests for typhoid fever. We report that, of 200 patients presenting with fever, 17.0% had concurrent malaria and typhoid fever (Salmonella typhi) based on bacteriological proven diagnosis as compared with 47.9% based on the Widal test. A higher proportion of patients (32.5%) had malaria coexisting with S. typhimurium when compared to S. paratyphi (2%) and S. typhi (P < 0.05). We conclude that the number of fever cases diagnosed as malaria co-existing with typhoid fever is overestimated.
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PMID:An update on concurrent malaria and typhoid fever in Cameroon. 1089 76

The performances of the MRL dengue fever virus immunoglobulin M (IgM) capture enzyme-linked immunosorbent assay (ELISA) and the PanBio Dengue Duo IgM capture and IgG capture ELISA were compared. Eighty sera from patients with dengue virus infections, 24 sera from patients with Japanese encephalitis (JE), and 78 sera from patients with nonflavivirus infections, such as malaria, typhoid, leptospirosis, and scrub typhus, were used. The MRL test showed superior sensitivity for dengue virus infections (94 versus 89%), while the PanBio test showed superior specificity for JE (79 versus 25%) and other infections (100 versus 91%). The PanBio ELISA showed better overall performance, as assessed by the sum of sensitivity and specificity (F value). When dengue virus and nonflavivirus infections were compared, F values of 189 and 185 were obtained for the PanBio and MRL tests, respectively, while when dengue virus infections and JE were compared, F values of 168 and 119 were obtained. The results obtained with individual sera in the PanBio and MRL IgM ELISAs showed good correlation, but this analysis revealed that the cutoff value of the MRL test was set well below that of the PanBio test. Comparing the sensitivity and specificity of the tests at different cutoff values (receiver-operator analysis) revealed that the MRL and PanBio IgM ELISAs performed similarly in distinguishing dengue virus from nonflavivirus infections, although the PanBio IgM ELISA showed significantly better distinction between dengue virus infections and JE. The implications of these findings for the laboratory diagnosis of dengue are discussed.
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PMID:Comparison of PanBio dengue duo enzyme-linked immunosorbent assay (ELISA) and MRL dengue fever virus immunoglobulin M capture ELISA for diagnosis of dengue virus infections in Southeast Asia. 1047 22


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