Streptococcus constellatus

Streptococcus salivarius (undesignated strain) is a species native to the human oral cavity and upper respiratory tract, where it is one of the first bacteria to colonize at birth.

Streptococcus pneumoniae (the pneumococcus) is a commensal bacterium of the upper respiratory tract that can cause serious opportunistic infections, including pneumonia, meningitis, and septicemia, particularly in immuno…

Streptococcus pyogenes (Group A Streptococcus) is a human pathogen responsible for conditions such as strep throat, scarlet fever, and more serious invasive infections, and is not a probiotic organism.

Streptococcus zooepidemicus (Group C Streptococcus) is an animal-associated pathogen — common in horses and other livestock — that can occasionally cause zoonotic infections in humans, particularly through consumption of…

Streptococcus thermophilus is a thermophilic lactic acid bacterium best known as a starter culture in yogurt and cheese production, where it works in symbiosis with Lactobacillus delbrueckii subsp.

Streptococcus mitis is a gram-positive commensal bacterium that forms part of the normal oral and upper respiratory microbiota in humans.