A New South Wales escort has been charged after she allegedly knowingly transmitted HIV to a customer in Western Australia.

NSW Police said the 39-year-old was hired through an adult website advertising transgender escorts in January last year.

Officers said the woman was arrested at a hotel in Surry Hills on Tuesday afternoon.

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Police said she had been working in the Redfern area.

The woman was arrested under a West Australian Police arrest warrant.

WA Police have said the escort was legally a man who identified as a woman and was diagnosed with HIV in 2014.

A statement from WA police said the escort had unprotected sex with the client, despite the diagnosis and counselling about treatment options and disclosure obligations she had received.

She was charged with allegedly knowingly infecting someone with the HIV virus and was refused bail at Central Local Court on Thursday.

WA Police detectives applied for an extradition order and it was approved.

They said they expected to transport the woman to WA in the coming days.

The client was diagnosed with HIV in September 2015 and complained to police.

NSW Sex Crimes Squad detectives are continuing their inquiries into the escort’s activities in Sydney and appeal for anyone with information to come forward.