Partial Analysis of the Genomes of Two Nontypeable Haemophilus influenzae Otitis Media Isolates

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Partial analysis of the genomes of two nontypeable Haemophilus influenzae otitis media isolates.

In 1995, The Institute for Genomic Research completed the genomic sequence of a rough derivative of Haemophilus influenzae serotype d, strain KW20. This sequence, though extremely useful in understanding the basic biology of H. influenzae, has yet to provide significant insight into our understanding of disease caused by nontypeable H. influenzae (NTHI), because serotype d strains are not gener...

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Modified Lipooligosaccharide Structure Protects Nontypeable Haemophilus influenzae from IgM-Mediated Complement Killing in Experimental Otitis Media

UNLABELLED Nontypeable Haemophilus influenzae (NTHi) is a Gram-negative, human-restricted pathogen. Although this bacterium typically colonizes the nasopharynx in the absence of clinical symptoms, it is also one of the major pathogens causing otitis media (OM) in children. Complement represents an important aspect of the host defense against NTHi. In general, NTHi is efficiently killed by compl...

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Otitis media in children: local immune response to nontypeable Haemophilus influenzae.

Twenty children experienced 30 episodes of otitis media with effusion due to nontypeable (NT) Haemophilus influenzae in the first 2 years of life. The local and systemic immune responses to homologous strains of NT H. influenzae were determined by an immunodot assay. Strain-specific immunoglobulin G (IgG) antibody predominated in the middle ear fluid (MEF). It was detected in 91% of the childre...

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Genomic sequence of an otitis media isolate of nontypeable Haemophilus influenzae: comparative study with H. influenzae serotype d, strain KW20.

In 1995, the Institute for Genomic Research completed the genome sequence of a rough derivative of Haemophilus influenzae serotype d, strain KW20. Although extremely useful in understanding the basic biology of H. influenzae, these data have not provided significant insight into disease caused by nontypeable H. influenzae, as serotype d strains are not pathogens. In contrast, strains of nontype...

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A mutation in the sap operon attenuates survival of nontypeable Haemophilus influenzae in a chinchilla model of otitis media.

Bacteria have evolved strategies to resist killing by antimicrobial peptides (APs), important effectors of innate immunity. The sap (sensitivity to antimicrobial peptides) operon confers resistance to AP-mediated killing of Salmonella. We have recently shown that sapA gene expression is upregulated in the middle ear in a chinchilla model of nontypeable Haemophilus influenzae (NTHI)-induced otit...

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ژورنال

عنوان ژورنال: Infection and Immunity

سال: 2004

ISSN: 0019-9567,1098-5522

DOI: 10.1128/iai.72.5.3002-3010.2004