background: haemophilus influenzae type b (hib) has emerged as the predominant cause of meningitis in developing coun­tries wherever it has been studied using good microbiologic procedures, but data  regarding frequency, antimicrobial sus­ceptibility and preferable method for detection of haemophilus influenzae type b isolated from  iranian patients  were scarce. methods: one thousand and eight...

haemophilus influenzae, a major cause of meningitis in young children leading to death and other neurological sequelae. the disease leaves 15 to 35% of the survivors with permanent disabilities, such as, mental retardation or deafness. despite the availability of new and more powerful antibiotics children with hib meningitis still suffer from high mortality or morbidity. the emergence of multir...

background and objective: haemophilus influenzae type b (hib) is divided into two distinct genotypes, type i and type ii, based on the structure of capsular polysaccharides. the capsulation locus of haemophilus influenzae type b consists of three functionally distinct regions, designated regions 1 to 3. region iii contains hcsa and hcsb genes; however, notable sequence variation in this region ...

A coagglutination assay using monoclonal antibody is described for the identification of Haemophilus influenzae type b. An immunoglobulin G2a monoclonal antibody, Hb-2, directed against a serotype-specific outer membrane protein of H. influenzae type b was adsorbed to Staphylococcus aureus Cowan 1 cells. In a dot enzyme immunoassay, Hb-2 reacted with 453 of 455 H. influenzae type b isolates and...

Over a 3-year period, 96% of systemic infections in children caused by Haemophilus influenzae were of serotype b. Of 346 invasive infections, 15 (4%) were caused by non-type b H. influenzae. The monthly prevalence of ampicillin resistance in all isolates was highly variable (0 to 63%). Ampicillin resistance in H. influenzae causing invasive disease occurred in 13% of non-type b and 21.8% of typ...

Thirty-seven Haemophilus influenzae strains from nasopharyngeal swabs (NP) and 44 H. influenzae strains from cerebrospinal fluid (CSF) were investigated. Of the 37 H. influenzae isolates from NP, the serotypes of 30 isolates were nontypeable, 4 were type b, 2 were type c, and 1 was type a, whereas all of the 44 isolates from CSF were type b. The MICs of 16 antibiotics for the H. influenzae isol...

A peptidoglycan-associated lipoprotein of about 15 kilodaltons was purified from the outer membranes of Haemophilus influenzae by using nondenaturing detergents. To assess its vaccine potential, rabbit antiserum to the purified protein was obtained. The antiserum was specific for the peptidoglycan-associated lipoprotein in whole cell lysates of H. influenzae and was bactericidal for H. influenz...

Utilization of heme-hemopexin as a source of heme by Haemophilus influenzae type b is dependent on expression by this bacterium of the 100-kDa HxuA protein, which is both present on the bacterial cell surface and released into the culture supernatant (L. D. Cope, R. Yogev, U. Muller-Eberhard, and E. J. Hansen, J. Bacteriol. 177:2644-2653, 1995). Radioimmunoprecipitation analysis showed that the...

Haemophilus influenzae may make any one of six chemically distinct capsular polysaccharides, but only strains of capsular serotype b commonly cause systemic infection (e.g., meningitis) in humans. Molecular cloning of DNA was used to investigate the expression of type b capsule and its association with H. influenzae virulence. A virulent H. influenzae type b strain was used to construct a lambd...