How strep throat may trigger autoimmune disease – National Geographic

Daryl Austin. February 20, 2026. 

For most people, strep throat is a temporary infection that can be cleared with a short course of antibiotics—something an estimated 5.2 million people in the United States are treated for each year.

But in a handful of cases—as many as 1 in 200 children diagnosed with certain post-streptococcal autoimmune conditions—the story does not end when the painful swallowing subsides. Instead, the infection can leave a lasting imprint on the immune system—one that, under some circumstances, may trigger autoimmune disease and other long-term complications.

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