II. NON-BETA HAEMOLYTIC STREPTOCOCCI

II. NON-BETA HAEMOLYTIC STREPTOCOCCI VIRIDANS STREPTOCOCCI      This term presently denotes a group of streptococcal species, some strains of which produce partial haemolysis and green colouration (α-haemolysis) around colonies on blood agar plates and others produce no haemolysis Natural Habitat :      They are the most prevalent members of the normal flora in the human upper respiratory tract (100%) and are important for the healthy state of the mucous membranes.      The most important species are Streptococcus salivarius, Streptococcus mitis, Streptococcus mutans and Streptococcus sanguis. They are not bile soluble, and their growth is not inhibited by optochin disc. The medical importance of the viridans group is their association with dental sepsis, caries and bacterial endocarditis (the organisms may reach the blood stream as a result of trauma. They are the most common cause of subacute bacterial endocarditis when they settle on abnormal heart valves). STREPTOCOCCUS PNEUMONIAE "PNEUMOCOCCUS"      Click here to read more.

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