Final answer:
The title "Roman Fever" in the story symbolizes Alida Slade's enmity for Grace, malaria, and the plot-driven passion.
Step-by-step explanation:
The title "Roman Fever" in the story symbolizes all of the given options: Alida Slade's long repressed enmity for Grace, malaria, and the passion that drives the plot.
Alida Slade's long repressed enmity for Grace is represented by the hidden rivalry and jealousy that exists between the two women throughout the story. The title also references malaria, which is a literal interpretation of the term. Lastly, "Roman Fever" symbolizes the passion that drives the plot, as it represents the intense emotions, secrets, and betrayals that are revealed between the characters.