Sensitive assays for HBsAg may be positive following recent immunization. A positive result can lead to the donation being wasted, unnecessary tests and the need to contact the donor.
Note, hepatitis A immunization may be combined with hepatitis B immunization.
"Non-Live" immunizations do not use material that can cause infection. This means there is no risk to people receiving donated material from a recently immunized non-exposed donor.
As COVID-19 vaccines are new, additional guidance is given for these. This is included in the Coronavirus Infection entry.
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