|This article is not part of the Holby universe.
|This article covers a subject that is part of the real world, and thus should not be taken as a part of the Holby universe.
"The Index Case" was the seventh episode of Series 29, and the 918th episode of Casualty overall.
A man dies from a mysterious injury, leaving Connie wondering whether she missed something, and Cal and Ethan discover a rare virus that connects two patients.
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