(HealthDay News) -- Strep throat is an infection caused by group A Streptococcusbacteria. Unlike a sore throat triggered by the common cold or air pollution, strep throat requires prompt medical treatment.

The U.S. Centers for Disease Control and Prevention says warning signs of this dangerous infection include:

• A sore throat that strikes quickly.
• Severe pain when swallowing.
• Fever, often of at least 101 degrees Fahrenheit.
• Red and swollen tonsils, often accompanied by white patches.
• Small red spots on the roof of the mouth.
• Headache.
• Nausea and vomiting.
• Skin rash.
• Body aches.