Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Sydenham's chorea:

"

Penicillin prophylaxis is essential to treat cardiac features of rheumatic fever, even if subclinical (American Heart Association guideline).[1] If there are not features to warrant a diagnosis of rheumatic fever, it is arguable whether cardiac risk justifies prophylaxis or not; however, it is likely to reduce recurrence.[citation needed]