Dracula also represents a cultural “otherness” as he spends time familiarising himself with English culture and norms in order to infiltrate and prey on the society:
When he arrives in England, he metaphorically invades England via his attack on Lucy Westenra
She is a representation of England and its morals, so when she is attacked, those morals are attacked
As a result, when Lucy begins to change, she becomes a part of the “other” and becomes less like her old self, thus reflecting society's fears of invasion