H. influenzae (including Hib) are bacteria that can cause severe infections, primarily in children younger than 5 years old. Homepage for CDC's information on Haemophilus influenzae infections.

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 …

Haemophilus influenzae (H. influenzae) is a type of bacteria that can cause several different kinds of infections. These bacterial infections can range from mild, such as ear infections, to severe, such as …

Haemophilus influenzae, or H. influenzae, is a group of bacteria that cause different types of infections in infants and children. H. influenzae most commonly causes ear, eye, or sinus infections and pneumonia.

Apr 27, 2023 · Haemophilus influenzae is a bacteria characterized as a small, facultatively anaerobic, pleomorphic, and capnophilic gram-negative coccobacillus of the family Pasteurellaceae. It is a …

Detailed information on Haemophilus influenzae, including causes, symptoms, diagnosis, transmission, treatment, and prevention.

Mar 20, 2025 · One common type, Hib (Haemophilus influenzae type b), causes serious disease. It usually strikes children under 5 years old. Your child can get Hib disease by being around other …

May 6, 2025 · Haemophilus influenzae are pleomorphic gram-negative rods that commonly colonize and infect the human respiratory tract. The H. influenzae species is divided into typeable (encapsulated) …

Haemophilus influenzae, a bacterium, can be isolated in six encapsulated forms (types a-f) and in unencapsulated forms. The polysaccharide capsule is an important virulence factor; unencapsulated …

Sep 18, 2025 · Haemophilus influenzae is a small (1 µm X 0.3 µm), pleomorphic, gram-negative coccobacillus. It is a nonmotile, non–spore-forming, fastidious, facultative anaerobe.