The state opposed Palmer's request for bail due to the seriousness of the crime

She was found guilty of causing grievous bodily harm by having unprotected sex

The Perth transgender sex worker was allegedly diagnosed with disease in 2014

Clayton Palmer, who goes by Sienna Fox, is accused of infecting man with HIV

A transgender sex worker accused of causing grievous bodily harm by having unprotected sex with a man and passing on HIV has been found guilty.

Clayton James Palmer, who identifies as a woman and is now known as CJ, wept in the WA District Court on Friday when the jury found her guilty of causing grievous bodily harm.

The judge acknowledged that the transgender sex worker will face an 'onerous' time in a male prison after refusing her bail, pending sentence for infecting a Perth man with HIV through unprotected sex.

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Clayton James Palmer, who identifies as Sienna Fox (pictured), is not criminally negligent for passing HIV to a man because she never knew she had the disease, her lawyer told Perth court

Nurse Joanna Morgan visited Palmer's (above) home and to tell she had tested positive for HIV

Palmer visited the WA Substance Users Association in August 2014 to get tested for sexually transmitted infections and was later informed by nurse Joanne Morgan that there was a positive indication of HIV.

Prosecutor Ben Stanwix said Palmer, 40, never returned any follow-up phone calls or messages and refused to face reality, continuing to advertise her sexual services online.

Defence counsel Simon Freitag had argued Palmer was not criminally negligent because she never knew she had the virus.

Palmer met the victim, who cannot be named, two months after the meeting with Ms Morgan and continued to see him until August 2015, telling him she was regularly tested for sexually transmitted diseases.

In September 2015, the victim saw a doctor and was told she had HIV.

Police tracked down Palmer, who had moved to NSW, via online advertisements for her services under the name Sienna Fox.

On Friday Mr Stanwix said the state opposed bail due to the seriousness of the crime and nature of the harm done.

'It did involve a breathtaking disregard for the life and health of another human being over an extended period of time,' he said.

Palmer faced WA District Court accused of passing on HIV to a client through unprotected sex

Judge Christopher Stevenson said being in a male prison would be especially onerous for her but he agreed the offence was too serious to grant bail.

Mr Freitag said when Palmer spent nine months in a male prison in 2016 following her extradition to WA, she was placed in the Special Handling Unit at Casuarina Prison in a cell alone and was sometimes searched by male guards.

Judge Stevenson made some provisional findings and comments ahead of sentencing, noting that Palmer's ads had stated she was 'discrete, private and very clean'.

He said Palmer had breached her duty of care to the victim, who now suffered prejudice from some people. Palmer will be sentenced on February 16.