A 9 years old child presented to OPD with complaints of high grade fever, vomiting, one episode of seizure. CSF examination was done and Gram staining of the culture showed the following finding. What is the probable causative agent?

Bacteria of the genusStreptococcusare gram-positive cocci typically arranged in chains. The genus includes three of the most impoant pathogens of humans. The group A streptococcus (S pyogenes) is the cause of "strep throat," which can lead to scarlet fever, rheumatic fever, and rheumatic hea disease; the ability of some hypervirulent strains to cause catastrophic deep tissue infections led British tabloids to apply the gory label "flesh-eating bacteria." The group B streptococcus (S agalactiae) is an impoant but preventable cause of sepsis in newborns and The pneumococcus (S pneumoniae) a leading cause of both pneumonia and meningitis in persons of all ages.