Conclusion
We presented a rare case of an acute primary peritonitis due to group A streptococci following vaginal delivery in a young and healthy patient complicated with septic shock and streptococcal toxic shock syndrome. Despite of surgical treatment in addition to the broad-spectrum antibiotics, it had a lethal issue within 12 hours. That is why genitourinary tract should be considered as the main entry site in GAS infection especially on post-partum period and an adequate therapy should be initiated on time.