Several West Australian parents have contacted police worried their children may have had contact with a camp counsellor accused of sexually abusing boys in the United States.

In a statement released on Wednesday, WA police said child abuse squad detectives would interview the children to determine their contact with 25-year-old Scott Zirus.

Zirus, from Pinjarra, south of Perth, appeared in the District Court in Kerr County Texas for arraignment on Monday accused of molesting three boys at a Texan camp.

He faces charges of aggravated sexual assault of a child, indecency with a child and continuous sexual abuse of a child under 14.

US authorities said Zirus had confessed in videotaped interviews to sexually assaulting two boys at a Texan camp.

Zirus entered not guilty pleas to all charges during the court appearance, did not seek bail and a trial was set for March 9.

He was working at a camp in the US as part of an international exchange program.

WA police urged any parents concerned over their child's contact with Zirus to call Crime Stoppers on 1800 333 000.