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Pneumococcus - gallery
Streptococcus pneumoniae or pneumococci are gram-positive cocci in pairs, which may be capsulated. Colonies are 1-2mm, α-haemolytic and may appear as ‘draughtsman’ colonies (due to autolysis of the organisms). If incubated in anaerobic conditions, the colonies may appear larger and more mucoid. It is, like other Streptococcus spp., catalase-negative. Traditionally, a few of the properties of the pneumococcus were exploited to […]
Paracoccus Yeei
Paracoccus yeei is an aerobic Gram-negative coccobacilli typically found in soil and brine. It appears as diplococci and may have a visible vacuole – giving an “O” shaped appearance. It may under-decolourise and appear as Gram-positive cocci. It is oxidase-positive and confused with Moraxella/Neisseria. Identification can be made using automated systems like VITEK-2 GN, MALDI-ToF and DNA […]