Passive haemagglutination of erythrocytes sensitized with antigen is an extremely sensitive method for the detection of antibody. Its application to the serological diagnosis of syphilis was first reported by Rathlev (1965, 1967), using a haemagglutination technique for the detection of specific antitreponemal antibody in which formolized tanned sheep cells sensitized with ultrasonicated materi...

Investigations with antisera prepared in rabbits and sheep and active immunity experiments in mice showed that strains of Pasteurella multocida which, according to the haemagglutination test, are serologically related, do not necessarily give rise to cross immunity. Conversely, it was found that serologically unrelated strains may exhibit an appreciable degree of cross protection. The unreliabi...

An ELISA method was developed for the measurement of toxoplasma IgG antibodies in human serum using antigen-coated polystyrene beads as a solid phase and anti human IgG-horse radish peroxidase conjugate as an enzymatic tracer. In order to assess ELISA sensitivity and specificity, a between methods comparison was made using 'conventional' serological tests as reference (dye-test, crossover-linke...

The introduction of the treponemal immobilization (TPI) test by Nelson and Mayer (1949) provided the first verification test for syphilis which proved fully acceptable to the clinician. After 20 years it is still accepted by a large body of opinion as the verification test of choice for the diagnosis of latent and late syphilis. The test's characteristic of becoming positive towards the end of ...

Forty one consecutive patients (24 males and 17 females) with AIDS had their blood assayed for HBsAg, anti-HBs and anti-HBc by Reversed Passive Haemagglutination (RPHA), Passive Haemagglutination (PHA) and Enzyme Linked Immunosorbent Assay (ELISA) techniques respectively. 5 (12.2%) were found positive for HBsAg. 10 (24.4%) for anti-HBs and 31 (75.6%) for anti-HBc. 32 (78%) out of 41 patients wi...

Haemagglutination of bluetongue virus (BTV) was demonstrated for the first time by making use of a purified preparation of the virus. The reaction was found to be independent of variations in the pH, temperature, buffer system and origin of the erythrocytes used in the test. A haemagglutination inhibition test, subsequently developed, was demonstrated to be serotype specific. The storage of the...