Why did the baby not produce antibodies after receiving the hepatitis B vaccine?

Patient's question:

Here is the translation of the provided text into English, with the return characters kept as they are:
"Go for a blood test, the doctor said no antibodies were produced. Need to get three more hepatitis B vaccine shots."

Doctor's answer:

Hello: It is indeed true that some people may not develop antibodies after getting the hepatitis B vaccine. This can also happen in adults. That's why it's essential to check whether antibodies have been produced after vaccination.
Advice: Don't be too anxious. As long as the child hasn't been infected, it's okay to get another shot. This is called delayed response, where some people develop antibodies after a while.
Lifestyle care: Wishing you and your baby health and happiness. Also, the adults should get vaccinated as well.

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