Vaccine scares are not uncommon. The abrupt suspension of Covid-19 shots made by BioNTech pending investigations over “packaging defects” in a batch administered in Hong Kong and Macau has put the governments’ emergency response to the test.
Until there is scientific evidence showing safety is compromised, the moratorium, officials say, is a case for precaution rather than alarm. That said, the fiasco does nothing for a campaign that is resisted by many people. Every effort must be made to reassure confidence.