The saliva of an Illawarra school teacher accused of child sex offences matches swabs taken from one of his alleged victims, a court has heard.
The fresh evidence came to light as he was due to face trial in Wollongong District Court on Monday.
The man, who was an assistant school principal at an Illawarra school at the time of the alleged offences, pleaded not guilty to six indecent assault charges in November last year.
The charges stemmed from allegations he fondled two young girls on an evening in March, 2013.
On Monday, Crown prosecutor Kate Ratcliffe told Wollongong District Court that swabs taken from the nipples of one of the alleged victims had saliva with DNA that matched that of the accused.
The court heard there were other reports outstanding, including the results from an examination of the clothing one of the girls was wearing at the time of the alleged offence - but nothing was likely to come of that.
That report would be available to the court on Tuesday, Ms Ratcliffe said.
Defence barrister Susan Oliver was critical of the prosecution, noting there was no indication fresh evidence would potentially come to hand when the matter was mentioned in court last week.
The court heard the defence would wait to see the full prosecution case against the accused before it acted.
"It may well be very significant evidence in the context of this case," Wollongong District Court judge Paul Conlon noted.
He adjourned the matter until Tuesday.