A doctor at Children's Hospital has become the second employe there in two months to contract pertussis, or whooping cough, from a patient, hospital officials said yesterday.

The physician, whom the hospital declined to identify, caught the highly infectious disease from a 9-month-old girl who was admitted to the hospital July 6, officials said.

The doctor, who was the admitting physician for the child, was diagnosed as having pertussis July 20. Although the disease causes severe coughing bouts in children and is sometimes fatal, it is described as troublesome but rarely serious in adults, except for the aged.

Officials said the child and the doctor were "successfully treated," and the child has been sent home and the doctor has returned to work.

In June, an attendant at the hospital contracted pertussis from a 3-week-old Arlington girl who later died from the disease.

"We want the public to know that there is not some problem with in-hospital infection control," said Harold Kranz, a hospital spokesman. "Both of these cases came in from the community."

All patients and staff who might have had "even casual contact" with the physician or the child are being screened for the disease, Kranz said.