Moraxella lacunata
# Moraxella lacunata

Moraxella lacunata is a rod-shaped, Gram-negative, nonmotile bacterium, generally present as diploid pairs. It causes one of the commonest forms of catarrhal conjunctivitis.

## History

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.

## Characters

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.

## Clinical significance

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.
* The discharge is grayish yellow, adherent to the lashes, and accumulates mainly at the angles.
