Abstract: Streptococcal toxic shock syndrome (STSS) is a hyperacute, life-threatening illness, a complication of invasive streptococcal (mostly group A, rarely groups B, G or C) infection. There is no portal of entry (skin, vagina, pharynx) in nearly half of the STSS cases. The initial signs and symptoms (fever, flu-like complaints, hypotension) are scarce and aspecific, but because of its rapid progression and poor prognosis, early high level of suspicion is necessary. Management has 3 crucial points: initiation of anti-streptococcal regimen (and intravenous immunoglobulin in some cases), aggressive intensive care support of multi-organ failure, and surgical control of the infective source. In this article, we present a case of a patient succumbing to streptococcal toxic shock syndrome which was preceded by primary S. pyogenes bacteremia, and review the key points of this potentially fatal disease for practising clinicians. Orv Hetil. 2019; 160(48): 1887–1893.