A young woman develops fever, vomiting, diarrhea, and a diffuse rash; vaginal culture grows coagulase-positive Staphylococcus aureus. What diagnosis is most likely?

A young woman develops fever, vomiting, diarrhea, and a diffuse rash; vaginal culture grows coagulase-positive Staphylococcus aureus. What diagnosis is most likely?

• A. Kawasaki disease
• B. Toxic shock syndrome
• C. Pelvic inflammatory disease
• D. Scalded skin syndrome

Answer: (B)

Toxic shock syndrome is caused by a toxin produced by Staphylococcus aureus acting as a superantigen. When a toxin like TSST-1 enters the circulation, it triggers massive, nonspecific activation of T cells and widespread cytokine release. That cytokine storm explains the fever, vomiting, diarrhea, and the diffuse erythrodermic rash seen in this situation. The finding of coagulase-positive S. aureus in the vaginal culture points to the source producing the toxin, which is a classic setup for tampon-associated or vaginal-colonization–related TSS in a young woman. Kawasaki disease is a pediatric inflammatory syndrome with prolonged fever and mucocutaneous findings, not linked to toxin-producing vaginal Staphylococcus aureus. Pelvic inflammatory disease presents mainly with lower abdominal pelvic pain and tenderness, not a diffuse rash or toxin-mediated systemic symptoms. Scalded skin syndrome also involves Staphylococcus aureus toxin but typically affects infants or young children and shows exfoliation with Nikolsky sign rather than the GI symptoms and diffuse rash pattern described here.

Toxic shock syndrome is caused by a toxin produced by Staphylococcus aureus acting as a superantigen. When a toxin like TSST-1 enters the circulation, it triggers massive, nonspecific activation of T cells and widespread cytokine release. That cytokine storm explains the fever, vomiting, diarrhea, and the diffuse erythrodermic rash seen in this situation. The finding of coagulase-positive S. aureus in the vaginal culture points to the source producing the toxin, which is a classic setup for tampon-associated or vaginal-colonization–related TSS in a young woman.

Kawasaki disease is a pediatric inflammatory syndrome with prolonged fever and mucocutaneous findings, not linked to toxin-producing vaginal Staphylococcus aureus. Pelvic inflammatory disease presents mainly with lower abdominal pelvic pain and tenderness, not a diffuse rash or toxin-mediated systemic symptoms. Scalded skin syndrome also involves Staphylococcus aureus toxin but typically affects infants or young children and shows exfoliation with Nikolsky sign rather than the GI symptoms and diffuse rash pattern described here.