People who received BioNTech's coronavirus vaccine had ten times the amount of antibodies than those given China's Sinovac, a Hong Kong study has shown, adding to growing data on different jabs' effectiveness... Researchers said antibodies are not the only measure of a vaccine's success at fighting a particular disease. But they warned that "the difference in concentrations of neutralising antibodies identified in our study could translate into substantial differences in vaccine effectiveness". Those who received Sinovac had "similar or lower" levels of antibodies to those seen in patients who caught and successfully fought off the disease.