A member asked:

Finished engirex b course (0-1-6) anti hbs were 6.3miu/ml.got two additional doses(brand of vaccine dnt know)after 16 month of 1st course (two are a month apart).total 5 doses overall.after 7 months of 5th dose anti hbs54.57.is extra doses harm body?

A doctor has provided 1 answer
Dr. Jay Park answered

No serious harm has been known from receiving extra doses. As a matter of fact, about 5% of individuals do not develop/maintain protective level of Hepatitis B surface antibody (anti-HBsAg) after standard 3-dose hepatitis B immunization and receive another 3 doses.

Answered 7/10/2021

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