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Query: UNIPROT:O75191 (H. influenzae)
 4,961 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

We investigated the role of serum bactericidal activity in Hemophiplus influenzae type b infections in infants with meningitis and in a rat model. In infected infants, 13/22 admission sera had bactericidal activity against the infecting strain, and bacteremia was as frequent in those with bactericidal activity (54%) as those without (56%). The coexistence of bactericidal activity and bacteremia was reproduced and studied in experimentally infected weanling rats. Serum from such rats kills in vitro 95% of conventionally broth-grown bacteria within 10 min, but does not kill organisms obtained from the infected animals. Thus bactericidal activity as conventionally determined for H. influenzae b may have no relevance in vivo, Incubation of broth-grown bacteria in normal rat serum for 30 min at 37 degrees C produces a resistance like that of in vivo organisms. This phenotypic conversion depends on factors that are of molecular weight less than 1,000, stable to 100 degrees C, but destroyed by ashing. When injected intravenously into nonimmune animals, broth-grown bacteria are quickly cleared, while serum-preincubated bacteria are not. The latter, however, are cleared when injected into bacteremic rats (half-life 30 min). Bacteremia in the rats may persist despite this capacity for clearance because bacteria are entering the blood from extravascular fluids, which contain greater than 90% of the total bacterial burden.
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PMID:The paradox of Hemophilus infuenzae type B bacteremia in the presence of serum bactericidal activity. 108 78

20 patients with Haemophilus influenzae meningitis who had been treated with chloramphenicol over the period 1959-1970 and 23 patients who had been treated with ampicillin over the period 1968-1974 were re-examined by hearing tests in 1975. In all the cases the two agents had been given initially by the parenteral route, chloramphenicol in doses varying between 50 and 150 (averaging 101) mg/kg/day and ampicillin in doses varying between 125 and 350 (averaging 229) mg/kg/day. Five of the 20 patients in the chloramphenicol group were found to be deaf on one ear, whereas 1 of the 23 patients in the ampicillin group was completely deaf. A further 3 in the chloramphenicol group and 1 in the ampicillin group had slight sensorineural hearing loss on one ear. Only in 2 of the 6 deaf patients was the loss discovered during the time of hospital care. The present study has not provided any evidence supporting the recently reported observation (Gamstorp and Klockhoff, 1974) that the frequency of hearing loss might be higher after ampicillin than after chloramphenicol treatment for H. influenzae meningitis.
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PMID:Hearing loss as a sequel to chloramphenicol and ampicillin treatment of Haemophilus influenzae meningitis. 108 85

This study was undertaken to determine whether the terminal complement components (C3-9) are involved in the nonimmune host defense against Haemophilus influenzae type b septicemia and meningitis. Using cobra venom factor, infant rats were depleted of C3 and C5. After intranasal challenge with H. influenzae type b, the complement-depleted rats developed a greater incidence and magnitude of bacteremia and a higher mortality rate. In contrast to the effects on bacteremia, complement depletion did not directly influence either the occurrence of meningitis or bacterial multiplication within the cerebrospinal fluid. These experiments provide evidence that the complement system may be an important mechanism of natural immunity to H. influenzae type b.
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PMID:Participation of complement in the nonimmune host defense against experimental Haemophilus influenzae type b septicemia and meningitis. 108 32

The immunologic responses of 100 children hospitalized with meningitis due to Haemophilus influenzae type b were measured by the bactericidal antibody assay (BAA) and radioimmunoassay (RIA) for detection of antibody. Short-term (14-17 days after onset of illness) responses were detected by RIA alone in 20 children, by BAA alone in six, and by both tests in 23. The more sensitive RIA detected 20 children who would have been labeled "immunologically unresponsive" had only BAA been used. The magnitude of the antibody response was clearly related to age. Of 26 children with no immediate antibody response, 11 still had no rise in titer of antibody when restudied two to 20 months later; the remaining 15 had subsequent increases in titer. Nine of 10 children who showed an immediate antibody response remained positive when additional blood smaples were taken two to 18 months later. Over half of the children initially unresponsive to H. influenzae type b meningitis subsequently developed specific antibodies. The remainder, who failed to acquire detectable antibodies at either the acute stage of illness or late in convalescence, deserve further investigation as to the nature of their immunologic hyporesponsiveness to H. influenzae type b meningitis.
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PMID:Serologic responses of children with meningitis due to Haemophilus influenzae type b. 108 75

In systemic infections caused by Hemophilus influenzae, type b, the capsular polysaccharide, polyribophosphate, is released into the circulation. Polyribophosphate was quantitated in serial serum and cerebrospinal fluid samples from 45 children with H. influenzae, type b meningitis by means of a radiolabeled antigen-binding inhibition assay. Polyribophosphate was regularly found in acute serum and cerebrospinal fluid samples and could be detected in unbound form for periods of 1-30 days after initiation of effective therapy. Complexes of polyribophosphate dissociable with acid and pepsin were detected in serum samples from 17 patients, in one case for a period of 145 days after hospitalization. Polyribophosphate levels and patterns of clearance were studied in relation to hospital course and antibody response. Patients with prolonged antigenemia had protracted fevers and severe neurological symptoms during hospitalization, frequently with focal complications.Antipolyribophosphate antibody responses were detected during the first 100 days of convalescence by radioimmunoassay in 79% of the patients studied, including 60% of the children 1 yr or less in age. The intensity of antibody response although clearly related to the age of the patient, was more reliably predicted by the efficiency of antigen clearance. Antibody responses were uniformly of low magnitude in patients with prolonged antigenemia, irrespective of age. Paients who failed to develop antibody to polyribophosphate after meningitis also exhibited impaired antigen clearance. These studies suggest that mechanisms necessary for clearance of polyribophosphate may influence the development and intensity of the humoral immune response and raise the possibility of developmental deficiencies in the clearance system in infants and children.
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PMID:Circulating polyribophosphate in Hemophilus influenzae, type b meningitis. Correlation with clinical course and antibody response. 109 17

25 patients, 15 children and 10 adults, with the clinical diagnosis of acute epiglottitis were studied. Patients severely ill on admission, 13 children and 1 adult, were immediately treated with tracheotomy and antibiotics; the remaining patients with antibiotics only. Haemophilus influenzae type b was the causative organism in all children and in 3 adults. One adult had a Diplococcus pneumoniae infection. No pathogens were isolated from the 6 remaining patients. Four of the children developed H. influenzae type b meningitis. All patients recovered. Anti-b antibodies were not demonstrable in any initial serum sample while agglutinating anti-b antibodies were found in subsequent samples (indirect hemagglutination). All patients with a type b infection had already initially precipitating anti-O antibodies against their own strain, and in most cases complement-fixing anti-O antibodies (mixed H. influenzae O antigen) with rising titers in subsequent serum samples. A possible connection between the presence of anti-O antibodies initially and the development of the acute epiglottitis is discussed.
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PMID:Acute epiglottitis; a clinical, bacteriological and serological study. 110 71

Three hundred ninety-seven children were admitted to the Children's Hospital Medical Center, Boston between 1958 and 1973 with H. influenzae meningitis. The annual rate of admission and the percent of all cases of bacterial meningitis were not changed from that of the preceding decade. The age incidence was strikingly similar to that reported from this hospital for 1920 to 1932.
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PMID:Hemophilus influenzae meningitis at the Children's Hospital Medical Center in Boston, 1958 to 1973. 112 59

A survey of invasive H. influenzae infections has been underway in six regions of England and Wales since September 1990. In the first year, there were 433 cases of which 362 (84%) were due to H. influenzae type b (Hib). The majority of Hib infections were in children aged less than 5 years; there being an annual incidence of 26.4/100,000 in this age group. Meningitis occurred in 56% of cases of Hib infection. The results confirm previous evidence of the need to incorporate Hib vaccination into the childhood immunisation schedule. The ongoing survey data will provide useful information to assess the impact of an Hib immunisation programme.
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PMID:A survey of invasive Haemophilus influenzae infections. 128 90

A survey of invasive H. influenzae infections has been underway in 6 regions of England and Wales since September 1990. In the first year, there were 433 cases of which 362 (84%) were due to H. influenzae type b (Hib). The majority of Hib infections were in children aged less than 5 years (annual incidence in this age group is 26.4/100,000). Meningitis occurred in 56% of cases of Hib infection. The results confirm previous evidence of the need to incorporate Hib vaccination into the childhood immunization schedule. The ongoing survey data will provide useful information to assess the impact of an Hib immunization program.
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PMID:A survey of invasive Haemophilus influenzae infections--England and Wales. 129 32

Cytokines at an inflammatory site may be a better indicator of the clinical severity of an infectious disease than the serum levels of the cytokines. Concentrations of interleukin-1 beta (IL-1 beta) in paired samples of cerebrospinal fluid (CSF) from 10 rabbits with experimental bacterial meningitis caused by H. influenzae type b, were measured, and compared to the concentrations of four cytokines; IL-1 beta, interleukin-6 (IL-6), interleukin-8 (IL-8) and tumor necrosis factor-alpha (TNF-alpha) in CSF samples from 45 children with or without meningitis. The IL-1 beta concentrations in the CSF from rabbits with experimental meningitis were significantly higher than the concentrations in control animals without meningitis (p < 0.001). The mean CSF concentrations of IL-8 from meningitic children were significantly higher than in the control group without meningitis (p < 0.005). TNF-alpha was only detected in septic meningitis. Assays of IL-6, however, were not significantly different in the septic meningitis group, the aseptic meningitis group and the non-meningitis group. These data indicate a possible role of IL-1 beta, IL-8 and TNF-alpha as mediators in the meningeal inflammatory process in patients with meningitis and TNF-alpha, in particular, may play a role in the pathogenesis of septic meningitis.
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PMID:Concentrations of interleukin-1 beta, interleukin-6, interleukin-8 and TNF-alpha in cerebrospinal fluid from children with septic or aseptic meningitis. 130 8


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