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Updated: Apr 25, 2026

Isolation of Leukocytes from Human Breast Milk for Use in an Antibody-dependent Cellular Phagocytosis Assay of HIV Targets
Published on: September 6, 2019
HIV transmission through breastfeeding: still possible in developed countries
Sophie Blumental1, Alina Ferster2, Sigi Van den Wijngaert3
1Pediatric Infectious Disease Unit, and.
Insights
A child contracted human immunodeficiency virus (HIV) through breastfeeding years after birth. This case highlights postnatal transmission risks in developed nations, emphasizing ongoing clinician awareness and targeted health education.
Area of Science:
- Pediatrics
- Infectious Diseases
- Public Health
Background:
- Human immunodeficiency virus (HIV) prevention strategies have significantly reduced mother-to-child transmission.
- Late maternal seroconversion can complicate traditional screening protocols for HIV prevention.
Observation:
- A 13-month-old boy presented with unexplained hepatosplenomegaly and inflammatory syndrome, leading to the diagnosis of HIV infection.
- The infant's mother was also diagnosed with HIV around the same time, with seroconversion confirmed postnatally.
Findings:
- The mother tested HIV-negative during pregnancy and immediately postpartum, indicating late seroconversion.
- HIV was transmitted to the infant postnatally through breastfeeding, a rare but documented transmission route in developed countries.
Implications:
- This case underscores the continued risk of postnatal HIV transmission via breastfeeding, even in industrialized nations.
- Enhanced clinical awareness and targeted health education are crucial for identifying and preventing rare transmission events.
- Re-evaluation of screening protocols may be necessary to address late maternal seroconversion and postnatal transmission risks.
Abstract:
We describe here the case of a 13-month-old boy who acquired HIV infection postnatally through breastfeeding in a developed country in 2012. His mother had regular pregnancy follow-up and was found to be seronegative for HIV on 2 consecutive screening tests (during pregnancy and just after delivery). However, 1 year later, diagnosis of HIV infection arose in both of them after a pediatric emergency department visit for bronchitis when unexplained hepatosplenomegaly and inflammatory syndrome were noted. The negative maternal viral load found just after delivery confirmed that the mother's seroconversion occurred postnatally, which allowed for active HIV transmission during lactation and lack of the efficient preventive measures that have implemented in Belgium for years. We discuss this uncommon but still existing mode of HIV transmission in industrialized countries and highlight the importance of implementing new targeted health education interventions in addition to constant clinicians' awareness.
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