Haemophilus virulence

Virulence factors of Haemophilus ducreyi.

We investigated the susceptibility of virulent and avirulent strains of Haemophilus ducreyi to the bactericidal activity of normal human serum and to phagocytosis and killing by human polymorphonuclear leukocytes (PMNL). Strains were defined as virulent if intradermal inoculation into a rabbit produced a typical necrotic lesion. Nonvirulent strains produced no cutaneous lesions in rabbits. Viru...

Haemophilus Influenzae Microarrays: Virulence and Vaccines

In 1995 the genome sequence of the Haemophilus influenzae KW20 (Rd) strain was published, the first available for a free-living organism. The genome has been invaluable in global strategies to identify certain virulence-related genes, e.g. those involved in LPS synthesis, and also essential genes, but there is a paucity of wholegenome transcriptome studies. We have now constructed a whole-genom...

Virulence factors and mechanisms of antibiotic resistance of haemophilus influenzae.

Haemophilus influenzae is a small gram-negative coccobacillus known as one of the major causes of meningitis, otitis media, sinusitis and epiglottitis, especially in childhood, as well as infections of the lower respiratory tract, eye infections and bacteremia. It has several virulence factors that play a crucial role in patient inflammatory response. Its capsule, the adhesion proteins, pili, t...

Virulence genes and prevention of Haemophilus influenzae infections.

DNA repeats identify novel virulence genes in Haemophilus influenzae.

The whole genome sequence (1.83 Mbp) of Haemophilus influenzae strain Rd was searched to identify tandem oligonucleotide repeat sequences. Loss or gain of one or more nucleotide repeats through a recombination-independent slippage mechanism is known to mediate phase variation of surface molecules of pathogenic bacteria, including H. influenzae. This facilitates evasion of host defenses and adap...