Written by: Rob Des Hotel & Dean Batali
Directed by: Deran Sarafian
Original U.S. Air Date: March 3, 1998
Episode Summary: click to on Wikipedia.

After flu lands Buffy in the hospital, she rescues fevered children from Der Kindestod, a demon that can only been seen if you have a fever. This demon turns out to have killed her cousin when Buffy was younger and is why Buffy has such a fear of hospitals.