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In a lot of vampire lore, being bitten by a vampire just once doesn't turn a human into a vampire, but some sort of a thrall, enchanted and seduced by the vampire's alluring ways, to make the victim more pliable and easy to feed from, and only a sufficiently prolonged and deliberate series of bites will turn the human victim into a vampire.
Which is compatible with the theory that italians are the opposite of vampires. While vampires cannot stand the sight of crosses, stepping into a church, or being exposed to garlic or sunlight, and cannot see themselves in a mirror, italians become miserable if they cannot have access to a church, crosses, direct sunlight, garlic, and getting to see themselves in a mirror.
Consequently, sensually biting the neck of an italian may enthrall one, but will not immediately turn you into an italian. But a sufficiently prolonged and deliberate series of bites may get one to marry you, therefore giving you an italian citizenship.