 Luke, tell us about that. So what's old is new. And I remember diagnosing and treating syphilis in my residency program and my fellowship in the 80s. And we had very few cases of syphilis globally and in the United States around the end of the 90s and in 2000. But now syphilis is bad globally and in the United States, primary and secondary syphilis, and then, of course, congenital syphilis.