When a resident is diagnosed positive.
D000163:Acquired Immunodeficiency Syndrome / Q000517:prevention & control / Q000628:therapy*; D000368:Aged; D001291:Attitude of Health Personnel; D003142:Communication; D006801:Humans; D007318:Inservice Training; D008396:Maryland; D009735:Nursing Homes / Q000458:organization & administration*