Nine-month-old Lola Koupparis was being treated at the Royal London Hospital but allowed to leave yesterday.
She and her twin sister Isabella were attacked in their cots in Hackney, east London, last Saturday night.
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Hide AdSurrey: Families affected by the E.coli outbreak at a petting farm are preparing to launch a group legal action, the mother of twins left hospitalised by the bug said.
A report into the outbreak is due out on Tuesday.