Streptococcus salivarius

Streptococcus salivarius is a species of spherical, gram-positive, facultative anaerobic lactic acid bacteria that is both catalase and oxidase negative. S. salivarius colonizes (usually in chains) the oral cavity and upper respiratory tract of humans just a few hours after birth, making further exposure to the bacteria harmless in most circumstances. The bacteria is considered an opportunistic pathogen, rarely finding its way into the bloodstream, where it has been implicated in cases of sepsis in people with neutropenia, (a deficiency in white blood cells). S. salivarius has distinct characteristics when exposed to different environmental nutrients. For example, in the laboratory, if a growth medium is used that includes sucrose then S. salivarius is able to use the sucrose to produce a capsule around itself. However, if sucrose is replaced by glucose as on a GYC (glucose, yeast extract, calcium carbonate) plate, S. salivarius is unable to make a capsule from the glucose. More importantly, in the laboratory, S. salivarius can show a distinct clearing on GYC plates. This is because S. salivarius can ferment the glucose yielding lactic acid. Next, the lactic acid actually reacts with the calcium carbonate in the GYC plate, resulting in zones of clearings on the plate. Some strains of S. salivarius are being trialed for their use as a probiotic in the prevention of oral infections. Some strains of S. salivarius are found to produce BLIS (Bacteriocin-like Inhibitory Substances) which are antimicrobial peptides. These peptides display interspecies inhibition, and inhibit Streptococcus pyogenes (which causes strep throat infections). Lozenges containing S. salivarius are marketed to support immunity against more virulent Streptococcus strains. People with this strain of naturally occurring S. salivarius on their tongue have been shown to have fewer Strep throat infections. This is also being investigated for its potential to prevent rheumatic heart disease which is also caused by S. pyogenes.