To understand the potential risk factors and protective factors for invasive Haemophilus influenzae type b (Hib) disease, we conducted a case-control study among Navajo children less than two years of age resident on the Navajo Nation. We analyzed household interview data for 60 cases that occurred between August 1988 and February 1991, and for 116 controls matched by age, gender, and geographi...

Latex agglutination (LA) for the demonstration of Haemophilus influenzae type b capsular antigen in nasopharyngeal swabs was applied to the screening of H. influenzae type b carriers and compared with culturing by the antiserum agar method on Levinthal-bacitracin plates. Altogether, 51 (33%) of the 154 nasopharyngeal specimens collected from the close contacts of patients with invasive H. influ...

Haemophilus influenzae type b Minn A produced 12 lipoproteins with apparent molecular weights of between 14,000 and 67,000. The lipoproteins were identified by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and fluorography of delipidated extracts of cells grown in [3H]palmitate. When the delipidated cell extracts were subjected to acid methanolysis, tritium was quantitatively recove...

Detection of Haemophilus influenzae type b (HIb) antigenuria by latex agglutination has been shown to be sensitive, specific, and rapid. In children, antigenuria persisted for a mean duration of 10 days and a maximum of 18 days. Antigenuria was demonstrated in 25 of 30 patients with HIb infection but not in 62 with other types of infection. In five children, antigenuria confirmed the diagnosis ...

Received 2 September 2003; accepted 5 September 2003; electronically published 18 November 2003. Reprints or correspondence: Dr. Robert S. Daum, University of Chicago Children’s Hospital, MC 6054, 5841 S. Maryland Ave., Chicago, IL 60637-1470 ([email protected]). Clinical Infectious Diseases 2003; 37:1600–2 2003 by the Infectious Diseases Society of America. All rights reserved. 1058-...

We confirmed that the fimbriae of Haemophilus influenzae type b conferred hemagglutinating activity (HA) towards human erythrocytes, and erythrocytes of certain other species. Most (17/25) cerebrospinal fluid isolates lacked detectable HA on direct testing, but selective enrichment for fimbriation (f+) indicated that 22 of 25 strains could produce these surface structures. HA was unchanged from...

An enzyme-linked immunosorbent assay (ELISA) is described for detection of anti-capsular antibodies against Haemophilus influenzae type b. Polyribosephosphate was covalently bonded to poly-L-lysine before adsorption to microtiter plates. ELISA immunoglobulin G and immunoglobulin M anti-polyribosephosphate antibody titers were comparable to total anti-polyribosephosphate antibody concentration d...

Two commercially available reagents, latex particles (Bactigen) and Staphylococcus aureus suspensions (Phadebact), were compared for the detection of the capsular polyribitol phosphate antigen of Haemophilus influenzae type b in 18 pediatric patients with proven infections due to H. influenzae type b. Whereas both tests nearly equally detected the antigen in the first urine specimens from the p...

Thirty-eight pediatric outpatients with pneumonia were studied by counterimmunoelectrophoresis for the presence of Haemophilus influenzae type b or pneumococcal antigenuria. Of the 38 patients eight (21%) had H influenzae type b antigenuria and two (5%) had pneumococcal antigenuria. H influenzae type b antigenuria was detected more frequently in patients less than 2 years of age than in older c...