A transgender sex worker has been found guilty of causing grievous bodily harm to a client she infected with HIV.

Clayton James Palmer, who is now known as CJ Palmer, stood trial in WA's District Court over the past four days.

The victim had responded to her online advertisement for sexual services in November 2014.

The court heard that about two months earlier Palmer, who worked using the name "Sienna Fox", had been told by a nurse she had tested positive to HIV.

However she then did not respond to the nurse's repeated attempts to contact her to discuss treatment and continued to advertise for male clients.

The victim had unprotected sex with Palmer multiple times in 2014 and 2015 and was diagnosed with HIV in September 2015.

It was the prosecution's case Ms Palmer, who identified as a female but had male genitals, was criminally negligent because she was in control of bodily fluids that could endanger the health of another and she did not take precautions when she engaged in penetrative sex with him.

Palmer denied any wrongdoing, claiming that the nurse did not tell her she had HIV.

She also suggested the victim may have contracted the virus from someone else.

The jury deliberated for about four hours before finding her guilty.

Palmer and members of her family and friends cried as the verdict was delivered.

Offender to be held in men's prison

Judge Christopher Stevenson rejected Palmer's application for bail until she is sentenced next month and remanded her in custody.

She will be held at a male prison, something Judge Stevenson said he accepted would be "more onerous" for her.

The court heard she had already spent nine months in prison in 2016 following her extradition to WA from New South Wales after being charged.

Her lawyer, Simon Freitag, said that had caused her great hardship and, while the prison authorities made some "adjustments," Palmer had been kept in the high security Special Handling Unit at Casuarina Prison in a cell by herself and was sometimes searched by male officers.

Prosecutor Benjamin Stanwix submitted Palmer should receive further time behind bars because of the seriousness of the offence.

"It did involve a breathtaking disregard for the life and health of another human being over an extended time," Mr Stanwix said.

"The harm and the behaviour that was involved in this offence is of a very serious nature."

Judge Stevenson said the case was "unusual" because it was different from other grievous bodily harm trials, which usually involve someone being punched or something similar.

But he said Palmer had breached her "duty of care" to the victim, who now carried with him a "label" that meant he was subjected to prejudice from some of the people he dealt with.

Palmer cried as she was led away.

She is due to be sentenced on February 16.