Haemophilus influenzae colonizes healthy children and adults (although the rate of colonization is far greater for nontypable than for type b H influenzae) and is spread by direct contact, secretions, and/or aerosol.

Haemophilus influenzae (formerly called Pfeiffer's bacillus or Bacillus influenzae) is a Gram-negative, non-motile, coccobacillary, facultatively anaerobic, capnophilic pathogenic bacterium of the family Pasteurellaceae. The bacteria are mesophilic and grow best at temperatures between 35 and 37 °C. [1]

2024年8月20日 · Haemophilus influenzae is a fastidious, opportunistic pathogen of the respiratory tract that can cause invasive infections in susceptible populations

2023年4月27日 · Haemophilus influenzae is characterized as a small (0.3 micrometer to 1 micrometer), facultatively anaerobic, pleomorphic, and capnophilic gram-negative coccobacillus of the family Pasteurellaceae.

Haemophilus influenzae is a key pathogen of upper respiratory tract infections. Its reliable discrimination from nonpathogenic Haemophilus spp. is necessary because merely colonizing bacteria are frequent at primarily unsterile sites.

Haemophilus parainfluenzae and nonencapsulated H. influenzae typically colonize the upper respiratory tract in humans within the first few months of life. These bacteria typically cause sinusitis, otitis media, bronchitis, and pneumonia.

Complexes of Haemophilus influenzae cells with and without intact capsular material were prepared with type specific antisera. Thin sections of positively stained specimens were prepared and examined in the electron microscope.

This study leverages single-particle cryo-electron microscopy to elucidate the structural nuances of membrane proteins, focusing on the SLAC1 bacterial homolog from Haemophilus influenzae (HiTehA) purified with diverse detergents, including n-dodecyl β-D-maltopyranoside (DDM), glycodiosgenin (GDN), β-D-octyl-glucoside (OG), and lauryl maltose ...

In microscopic appearance, it is a small (1 × 0.3 µ) gram-negative bacterium. Stained organisms obtained from clinical specimens vary microscopically from small coccobacilli to long filaments.

Haemophilus influenzae and some of the other Haemophilus species are commonly encountered in the clinical microbiology laboratory and demonstrate a wide range of pathogenicity, from life-threatening invasive disease to respiratory infections to a nonpathogenic, commensal lifestyle.