Confused and have questions? We’ve got answers. With Chegg Study, you can get step-by-step solutions to your questions from an expert in the field. If you rather get 1:1 study help, try 30 minutes of free online tutoring with Chegg Tutors.


From Biology-Online Dictionary | Biology-Online Dictionary
Jump to: navigation, search



A gram-negative coccobacilli and pleomorphic bacterium that includes many species caused wide variety of infections in humans.


Haemophilus has been categorized as pleomorphic due to its wide range of shapes and all members of species is either aerobic or facultatively anaerobic. It has several species that can cause diverse type of illnesses including bones, joints, breathing and nervous system.

Haemophilus is suitable to grow on blood agar plates as well as on chocolate agar medium and cultured using “Staph streak” technique. It has the same ultra-structural features to other pathogenic bacilli and known to cause a variety of clinical syndromes.

Haemophilus is implicated in severe infections including Haemophilus parainfluenzae that can cause bacterial endocarditis, Haemophilus influenzae is a common agent of children meningitis and Haemophilus ducreyi that can caused Chancroid. On the other hand some of its species did not administer infections like Haemophilus aphrophilus a normal flora of the mouth.

Scientific Classification:

 Kingdom: Bacteria
 Phylum: Proteobacteria
 Class: Gammaproteobacteria
 Order: Pasteurellales
 Family: Pasteurellaceae
 Genus: Haemophilus

See also:

• Bacteria

• Facultative anaerobes