What is viridans streptococcus disease?

Under normal circumstances, viridans streptococci are a group of Gram-positive bacteria belonging to the family Streptococcaceae, encompassing several different species such as Streptococcus mutans, Streptococcus mitis, and Streptococcus salivarius. A detailed analysis is as follows:

Viridans streptococci are widely present in the normal microbial flora of human oral cavity, respiratory tract, gastrointestinal tract, and urinary tract. They coexist symbiotically with the human body and play a role in maintaining the microbial ecological balance in the mouth and other sites. Under normal conditions, viridans streptococci are non-pathogenic; however, when immune function is compromised—such as in cases of immunodeficiency, prolonged use of immunosuppressive agents, or undergoing radiotherapy or chemotherapy—these bacteria may become pathogenic and cause various infections, including oral infections, infective endocarditis, and intracranial infections.

Individuals with the aforementioned risk factors, especially those with weakened immune systems, require close monitoring and appropriate preventive measures.