Strep throat and scarlet fever are common bacterial infections in children that cause sore throat, fever, and rash. Symptoms of strep throat include sudden fever, sore throat, and swollen glands, while scarlet fever causes a sandpaper-like rash. Children should stay home from school or childcare until 24 hours after starting antibiotic treatment. Strep throat spreads through coughing or sneezing and is contagious until antibiotics are started. Proper handwashing and disinfecting shared items can prevent spreading the infection.