Five infants in Santa Clara County, California, were identified as possibly exposed to HIV after their families obtained donated breast milk from a woman who offered it in two private social media groups. The investigation, published in the CDC's Morbidity and Mortality Weekly Report, found no evidence that HIV was transmitted through the donated milk.
For parents, the practical takeaway is not the outcome. It is the gap the case exposed. The donor had tested negative for HIV at a prenatal screening in 2023 and did not know her status had changed. She posted offers of milk between May and October of 2025, and learned she was positive only when a routine prenatal test came back during a later pregnancy. Nothing in the informal exchange would have caught it.
