What to Do If a 6-Year-Old Has Received Hepatitis B Vaccine and Still Tests Negative for Antibodies?

A child of six years old received three doses of the Hepatitis B vaccine at birth but did not produce antibodies. Later, they received one dose of the Hepatitis A vaccine and one dose of the Hepatitis B vaccine, administered separately. A few days ago, a test still showed no antibodies. Can they still receive the vaccine? Thank you!
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