What is the definition of Stays Infection?

"A 'tays infection' is like a superhero villain, but instead of cape and batarangs, it wears a stethoscope and a face mask. It's the kind of germ that refuses to let go, even after it's been defeated by hand-washing and social distancing. Here's an unsettling example sentence: 'The 'tays infection' of last week's viral dance craze lingered on my toes, refusing to be washed away by a quick rinse and a good ol' fashioned cough.'"