Viridans streptococci, a diverse group of streptococcal species, are important causes of sepsis and pneumonia in the neutropenic host and sepsis and meningitis in the neonate. The oral mucosa is the most common portal of entry.

What does viridans streptococci do?

The viridans streptococci, and in particular the species of the mitis and salivarius groups, are dominant members of the resident microbiota of the oral cavity and pharynx in all age groups. They play an important role by inhibiting the colonization of many pathogens, including pyogenic streptococci.

Can viridans streptococci cause UTI?

Although these strains frequently are isolated from urine, they appear to play no pathogenic role in urinary tract infections.