From the US Centers for Disease Control:
“What can happen if someone else’s breast milk is given to another child?”
HIV and other serious infectious diseases can be transmitted through breast milk. However, the risk of infection from a single bottle of breast milk, even if the mother is HIV positive, is extremely small. For women who do not have HIV or other serious infectious diseases, there is little risk to the child who receives her breast milk.
Incidents of infants being fed the wrong mothers’ milk are a source of anxiety for both family and staff. This article reviews the infectious risks associated with misappropriated human milk. A plan of care for dealing with this problem is outlined along with specific recommendations regarding laboratory testing and follow-up.