Medically reviewed by Lauren Schlanger, MD Strep throat is a highly contagious infection caused by Group A Streptococcus ...

Most group A strep infections cause mild illnesses like strep throat — but when that bacteria spreads to the blood and deep ...

Severe strep infections are on the rise in the U.S. A new study shows a sharp increase in cases of invasive group A strep, ...

Strep throat is a bacterial infection in the throat and tonsils. Symptoms that include sore throat, red and swollen tonsils, fever, swollen lymph nodes; tiny, red spots on the roof of the mouth ...