Moraxella spp. are the normal flora of the mucosal surfaces of the respiratory tract. Its morphology is characterized by gram-negative spherical rod-shaped bacteria. Usually in a split plane, pairs or short chains arranged, pairs of adjacent surface flattening; in two mutually perpendicular to the plane of division, often into a tetrad or cluster arrangement. Young cultures may be fine rod-shaped, old cultures are mostly spherical. When cultured in anoxia and above the optimum temperature, it can promote the production of polymorphism. The genus is non-flagellated and non-powered. The most common is Catamorium, which on blood and chocolate agar plates, colonies are smooth, round, moist, translucent, grayish-white, 1 to 3 mm in diameter, and occasionally sunken into the agar. If sputum culture or blood culture results show Moraxella infection, you should seek medical attention to clarify the cause in the context of your condition and receive treatment if necessary.