Nontypeable Haemophilus influenzae M37 adheres to human buccal epithelial cells and exhibits mannose-resistant hemagglutination of human erythrocytes. An isogenic variant of this strain which was deficient in hemagglutination was isolated. A protein with an apparent molecular weight of 22,000 was present in the sodium dodecyl sulfate-polyacrylamide gel profile of sarcosyl-insoluble proteins fro...

Nonspecific reactions by the passive hemagglutination test for rubella viral antibody occurred with 1.5% of sera tested. Rises in passive hemagglutination titers (greater than or equal to 4X) occurred with some serum samples taken 14 days after vaccination.

Rantz and associates (1952, 1956) discovered an unusual antigen which is present in many species of gram-positive and absent in gramnegative bacteria, and referred to it as "nonspecies specific (NSS) antigen." This antigen becomes readily attached to erythrocytes and thus renders the latter specifically agglutinable by antibodies directed against it. Sheep red blood cells modified by Rantz anti...

BACKGROUND Influenza viruses use hemagglutinin (HA) arrays to bind to sialic acid moieties on the surface of cells; crosslinking of erythrocytes by this mechanism leads to hemagglutination. A number of synthetic polymers containing multiple sialic acid (Neu5Ac) groups as side chains are potent inhibitors of this process. Inhibition may be due to two mechanisms: polyvalent binding of the inhibit...

BACKGROUND As the natural hosts of avian influenza viruses (AIVs), aquatic and migratory birds provide a gene pool for genetic transfer among species and across species, forming transient "genome constellations." This work describes the phylogenetic dynamics of H1NX based on the complete molecular characterization of eight genes of viruses that were collected from 2014 to 2015 in Anhui Province...

one hundred sera from children 1 - 6 years of age, representative of a large serum collection, were tested for the prevalence of antibodies against different viruses. hemagglutination-inhibition (hi) antibodies were found in 68% for measles; 61 % for rubella; 75'% for influenza a2/hong kong/68, 16% for influenza b/md./59, 0% for group a arboviruses, 10% for group b arboviruses, 3% for phlebotom...

de Araujo, Wilson C. (National Institute of Dental Research, Bethesda, Md.), Eileen Varah, and Stephan E. Mergenhagen. Immunochemical analysis of human oral strains of Fusobacterium and Leptotrichia. J. Bacteriol. 86:837-844. 1963.-Lipopolysaccharides, isolated by phenol-water extraction of 27 strains of oral gram-negative bacteria conforming either to Fusobacterium polymorphum or Leptotrichia ...

Lectin activities and chemical characteristics of Escherichia coli, Lactobacillus spp. and Bifidobacterium spp. originating from the porcine cecal mucosal layer were studied based on hemagglutination assay (HA) and hemagglutination inhibition assay (HIA). Although all the bacterial strains were able to agglutinate erythrocytes of porcine or rabbit origin, much higher HA titers were consistently...