Moraxella lacunata is a rod-shaped,[1] Gram-negative, nonmotile bacterium, generally present as diploid pairs.[2] It causes one of the commonest forms of catarrhal conjunctivitis.[3]
| Moraxella lacunata | |
|---|---|
Scientific classification 
| |
| Domain: | Bacteria |
| Phylum: | Pseudomonadota |
| Class: | Gammaproteobacteria |
| Order: | Pseudomonadales |
| Family: | Moraxellaceae |
| Genus: | Moraxella |
| Species: | M. lacunata
|
| Binomial name | |
| Moraxella lacunata (Eyre 1900) Lwoff 1939 (Approved Lists 1980)
| |
History edit
Moraxella lacunata was first described independently by Victor Morax (1896) and Theodor Axenfeld (1897), hence the alternate name "Morax-Axenfeld diplobacilli" and the name of eye infection in humans is sometimes called Morax-Axenfeld conjunctivitis.[2]
Characters edit
It has the ability to change its morphology in laboratory. M. lacunata became shorter and tended to lose its Gram-negative staining characteristic when left out for 5 days. It also tended to retain these new characteristics on subsequent blood-agar transfers.[4]
Clinical significance edit
Infection occurs mainly in adults, but can occur at any age. It is characterized by:
- Chronic, mild angular blepharoconjunctivitis frequently localized on the lid at the outer canthus
- Typical erythema of the edges of the lids
- Slight maceration of the skin, most marked at the angles, especially the outer canthus
- Superficial infiltration of the cornea is not uncommon.[3]
- The discharge is grayish yellow, adherent to the lashes, and accumulates mainly at the angles.[5]
References edit
- ^ "Medical Definition of MORAX-AXENFELD BACILLUS".
- ^ a b Brenner, Don J.; Krieg, Noel R.; Staley, James R. (14 December 2007). Bergey's Manual® of Systematic Bacteriology: Volume 2: The Proteobacteria, Part B: The Gammaproteobacteria. Springer Science & Business Media. ISBN 9780387280226 – via Google Books.
- ^ a b Zhulin, Denis Larionov & Alexander. "Read the eBook The pathology of the eye (Volume 1) by John Herbert Parsons online for free (page 6 of 38)".
- ^ Horwich, Harry; Fedukowicz, Helena (1 October 1955). "Variations in Morax-Axenfeld Diplobacillus". AMA Arch Ophthalmol. 54 (4): 580–585. doi:10.1001/archopht.1955.00930020586011. PMID 13257988.
- ^ TERMIUM®, Government of Canada, Public Works and Government Services Canada, Translation Bureau. "tumefaccion [2 records] - TERMIUM Plus® — Search - TERMIUM Plus®".
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External links edit