On "Seinfeld", what is the name of Kramer's friend who had rabies?

On “Seinfeld,” Kramer's friend who had rabies was Bob Sacamano.

Bob Sacamano is one of the show’s most memorable unseen characters. Kramer repeatedly tells Jerry and the others stories about his friend, but Bob never appears on screen in a regular episode. His off-screen reputation grows through increasingly strange details about his health, jobs, family, and schemes.

The rabies reference comes in “The Glasses,” the third episode of Seinfeld’s fifth season, which first aired on September 30, 1993. After Elaine is bitten by a dog and begins worrying about infection, Kramer casually cites Bob as someone who once had rabies. The joke works because Kramer presents an extraordinary medical story as if it were ordinary neighborhood gossip.

Bob is easy to confuse with another recurring name from Kramer’s stories, but Sacamano is the canonical surname. Other episodes associate him with a hernia operation, a condom factory, a long stay at Kramer’s apartment, and various dubious business connections. The character’s never-seen status became part of the joke.