Allison Cameron is House's first diagnostic team member who is an immunologist in House M.D. Jennifer Morrison played Cameron from the series' beginning through her later recurring appearances.
Cameron is one of the original fellows recruited to House's diagnostic team, alongside Robert Chase and Eric Foreman. Her medical specialty is immunology, the study of the immune system and disorders involving it.
The character is often distinguished by her empathy and concern for patients, traits that contrast with House's cynical style. She also has a complicated personal history that influences her reactions to illness and death.
Cameron is sometimes confused with later team members such as Remy “Thirteen” Hadley or Martha Masters. Those characters join the diagnostic department in later seasons; Cameron belongs to the original team introduced in season one.