The parents of two children who were found playing with a used syringe at a hospital clinic where AIDS patients are treated have filed a lawsuit against the hospital.

Illinois Masonic Medical Center, where the incident occurred Tuesday, was sued last month by a woman who received a gynecological examination with swabs used on an AIDS patient. Both lawsuits seek at least $15,000 in damages, the minimum amount required by Illinois law in such cases.Both the woman and the children are being given the AIDS-fighting drug AZT as a precaution.

The parents' suit claims that Illinois Masonic was negligent in keeping a disposal bin for needles just inches off the floor where children could reach it.