Group A Streptococcus (GAS / Streptococcus pyogenes) — commonly known as "beta strep" (beta mikrobu) in Turkey — is a bacterial pathogen responsible for a wide spectrum of infections in children, ranging from common sore throat to serious invasive disease.

Common manifestations: Streptococcal pharyngitis (strep throat) — sudden onset sore throat, fever, swollen tonsils with white patches, swollen lymph nodes, headache; absence of cough or runny nose. Scarlet fever — strep throat + characteristic "sandpaper" rash, strawberry tongue, flushed face with perioral pallor.

Diagnosis: Rapid antigen detection test (throat swab) — result in minutes. If negative but clinical suspicion is high, throat culture is the gold standard (results in 24–48 hours). Important: most sore throats in children are viral — do not use antibiotics without testing.

Treatment: Penicillin or amoxicillin remains the first-line treatment for 10 days. Azithromycin for penicillin-allergic patients. Completing the full course is essential — premature stopping allows bacteria to survive and risks complications.

Why treat strep? Untreated strep can lead to serious complications: rheumatic fever (heart valve damage), post-streptococcal glomerulonephritis (kidney disease), peritonsillar abscess, and mastoiditis. If your child has a fever with sore throat and no cold symptoms, have them tested at your pediatrician's office.