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"Passive transfer of antibodies secondary to intravenous immunoglobulin infusion is a rare but important side effect that can lead to the wrong diagnosis and therapeutic decisions" Rato et al (2019).
Abstract:

Passive transfer of antibodies secondary to intravenous immunoglobulin infusion is a rare but important side effect that can lead to the wrong diagnosis and therapeutic decisions. It has never been reported in a newborn. A male newborn, vaccinated against hepatitis B and diagnosed with dilated cardiomyopathy, presented positive hepatitis B core antibodies at 12 days of life. Exclusion of hepatitis B infection was mandatory as it would be a contraindication to heart transplant. Passive transfer of antibodies was confirmed at 44 days of age, after seroreversion of hepatitis B core antibodies. Passive transfer of antibodies after intravenous immunoglobulin infusion can lead to a misleading diagnosis if not recognized. In our patient it could have been especially harmful had it prevented heart transplant. Screening for hepatitis B should be performed at least 1 month after intravenous immunoglobulin infusion.

Reference:

Rato, J., Alves, D. and Rodrigues, L. (2019) Passive Transfer of Hepatitis B Antibodies through Intravenous Immunoglobulin in a Neonate. Acta Médica Portuguesa. 32(12), p.782-784. doi: 10.20344/amp.9792.