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Results for “False Positive Reactions”

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At least 145 records · Page 8Linked to original sources
PubMed1983

False-positive reactions in the serological diagnosis of schistosomiasis.

Stool and urine samples from children living in an area in the Western Transvaal in which human schistosomiasis was not endemic were examined for parasites and the indirect fluorescent antibody test was performed on their sera. Since none of these children passed any schistosome ova in their excreta but approximately half of them had a positive serological reaction they must have been infected with either Schistosoma mattheei, which is common in snails and cattle in the area, or avian schistosomes. In view of the occurrence of such 'false-positive' results, general practitioners are advised not to rely too heavily on serological tests in the diagnosis of schistosomiasis.

Adolescent↗
PubMed1976

[Elimination by heat of false positive reactions during the detection of Australia antigen by passive hemagglutination tests].

The detection of the HB'S Antigen by a reversed passive haemagglutination test (Hépanosticon) in sera previously heated at 56 degrees C for 30 mn, is simple and rapid but gives a relatively high number of false positive results. A simple technique is suggested by heating sera betwen 68 degrees C and 80 degrees C and then by centrifugation at 1.500 g for 15 mn, to eliminate these false positive results. The supernatants are tested in the Hepanosticon technique and only the true positive samples, cheked for specificity by other techniques namely radioimmuno assay (R.I.A.) remain positive. Further research is pursued to confirm these first data and to define the exact degree of sensibility of this technique.

Evaluation Studies as Topic↗
PubMed1991

[A false positive reaction to lactose in polycarbohydrate media].

In combined media for primary identification Salmonella typhi are detectable by the lactose test only within a certain range of proteolytic activities, which fact is explained by specific features of these media. Reduced proteolytic activity and thiosulfate reductase activity in S. typhi cultures resulted in false-positive lactose test and false-positive hydrogen sulfide production test, this leading to identification of these cultures as Escherichia in accordance with the universally acknowledged classification scheme. Taking this feature into consideration, the author has additionally isolated 20 typical S. typhi strains of the 22 cultures isolated in the laboratory.

Bacteriological Techniques↗
PubMed1975

Gel precipitin tests for hepatitis-B surface antigen. False positive reactions due to the presence of staphylococcal antigen in contaminated plasma samples.

Plasma samples contaminated with coagulase-positive staphylococci were found to give a false positive precipitin line for hepatitis-B surface antigen in gel tests. The staphylococcal antibody was found to be present in both normal immunoglobulin and anti-hepatitis-B surface antigen immunoglobulin preparations and also in many normal plasma samples.

Antigens, Bacterial↗