A 5-year-old boy is detected to be HBsAg positive on two separate occasions during a screening program for hepatitis B. He is otherwise asymptomatiC. Child was given three doses of recombinant hepatitis B vaccine at the age of 1 year. His mother was treated for chronic hepatitis B infection around the same time. The next relevant step for further investigating the child would be to:
Obtain HbeAg and anti-Hbe levels Obtain anti-Hbs levels Repeat HbsAg Repeat another course of Hepatitis B vaccine