Bacterium
Haemophilus influenzae
Small Gram-negative coccobacillus with X/V factors
hee-MOFF-ih-lus in-floo-EN-zee
High-yield clue
Coccobacillus + chocolate agar/X and V factor vocabulary + Hib capsule concept.
Overview
A small Gram-negative coccobacillus used to connect respiratory flora vocabulary, capsule serotype concepts, and X/V growth-factor coursework clues.
Classification
- Gram-negative
- Coccobacillus
- Facultative anaerobe
- Encapsulated strains emphasized in coursework
Lab & identification clues
- Chocolate agar vocabulary
- X factor and V factor terms
- Satellitism teaching concept
Associations
- Otitis/sinusitis vocabulary
- Epiglottitis and meningitis historical Hib vaccine framing
- Respiratory flora contrast
Commonly confused with
- Moraxella catarrhalis
- Bordetella pertussis
- Streptococcus pneumoniae
Frequently asked questions
What is Haemophilus influenzae?
A small Gram-negative coccobacillus used to connect respiratory flora vocabulary, capsule serotype concepts, and X/V growth-factor coursework clues.
What is the Gram stain of Haemophilus influenzae?
Haemophilus influenzae is Gram negative.
What are the lab clues for Haemophilus influenzae?
Lab clues for Haemophilus influenzae include Chocolate agar vocabulary, X factor and V factor terms, and Satellitism teaching concept.
What is Haemophilus influenzae commonly confused with?
Haemophilus influenzae is commonly confused with Moraxella catarrhalis, Bordetella pertussis, and Streptococcus pneumoniae.
Original student-study summary. Sources checked: OpenStax Microbiology 2e, NCBI Bookshelf Medical Microbiology, and CDC topic pages where applicable; reviewed 2026-06. Educational only; no diagnosis, treatment, dosing, or specimen-handling guidance.