Three Statesboro High School students were diagnosed this week with scabies, an infestation of mites that burrow underneath the skin. As of Wednesday, the school nurse had seen 20 students "with evidence of" scabies or who have been in contact with someone with scabies, said Hayley Greene, spokesperson for the Bulloch County school system. Only three students, who are all friends, were diagnosed by a doctor as having scabies, but the other students, who also socialized closely with the three, were examined as well, she said.