Detection of mumps virus in the milk of a mother with epidemic parotitis at the time of delivery is of clinical interest, as this virus, to my knowledge, has not been hitherto isolated from this source. Mastitis is rarely listed among the manifestations of mumps. As described below, mumps virus was also detected in the milk of a lactating monkey in whom infection had been artificially induced.
REPORT OF A CASE
E. M., a 23 year old Negro woman, was admitted to the hospital1 on May 2, 1950, for parotitis of two days' duration. She had bilateral swelling and edema in the parotid areas. Mumps had developed in two of her children in the preceding three weeks. Shortly after arrival, the patient was delivered of a full term, normal infant. A sample of milk was obtained three days later at the onset of lactation, when the mother's breasts were