The group A streptococcus bacterium (Streptococcus pyogenes, or GAS) is a form of Streptococcus bacteria responsible for most cases of streptococcal illness. Other types (B, C, D, and G) may also cause infection.
- If you have strep throat infection, you will have a red and painful sore throat and may have white patches on your tonsils.
- You also may have swollen lymph nodes in your neck, run a fever, and have a headache.
- Nausea, vomiting, and abdominal pain can occur but are more common in children than in adults.