An elderly nursing home resident has allegedly been sexually assaulted by an employee of the care facility in Sydney’s south-west.

The woman, in her 70s, was allegedly assaulted by a nursing assistant at the home at Padstow Heights on Sunday.

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Nursing home employees alerted police to the incident and a 47-year-old man was arrested at a home in Heckenberg about 3:30pm on Thursday.

He was charged with aggravated sexual assault and refused bail.

The nursing assistant is expected to appear at Liverpool Local Court today.