Abstract
Human milk contaminated with S. kottbus caused an outbreak of illness in 7 of 22 infants in a neonatal intensive care unit. A case-control investigation failed to identify any risk factor except consumption of milk from a single donor, whose milk was subsequently found to be contaminated with S. kottbus. Collection of human milk from properly instructed donors screened for microbiological pathogens, refrigeration of this milk at 1-5.degree. C after collection and controlled distribution by a milk bank should minimize the few hazards associated with its consumption.