IPOH: A serology or antibody test may not be accurate enough to determine whether or not someone is fully vaccinated. Malaysian Society of Allergy and Immunology president Prof Dr Baharudin Abdullah said it is still unclear whether or not such tests have any value in determining a person's immunity status post-vaccination. "According to the US Food and Drug Administration, the Covid-19 vaccine induces antibodies differently from a natural infection. "An individual infected with Covid-19 may be tested positive by the antibody test but the antibodies from a vaccinated person may not be detectable," he said when contacted on Sunday (July 25).