In which episode of Scrubs three patients die because they got transplanted with organs infected by rabies?
The Scrubs episode you are thinking of is titled My Lunch. It was season 5 episode 20. In the episode, J.D. and Dr. Cox run into Jill Tracy (Nicole Sullivan) at the supermarket at lunchtime. Jill dies, and J.D feels bad that he didn't help a person who clearly needed help, Dr. Cox takes J.D out on lunch and comforts him. Jill's organs are donated to three transplant patients. Jill's autopsy reveals she didn't die of an overdose; she died of rabies, meaning all three of Dr. Cox's transplant patients are now infected. Despite their best efforts, the staff is unable to save the patients.