Jeremy was attempting to lift Penelope on the stage when his legs collapsed and he fell, with her falling on top of her. However, although his back was in pain, Penelope had trouble breathing.
Jeremy accompanied Penelope to the hospital. He is very supportive, even donning a mask and gown when her skin starts falling off.
However, House suspects Penelope has gonorrhea despite her negative test. he orders Jeremy tested, and he tests positive. Once he finds out, he realizes he got the disease from Penelope and he leaves.