evidence: STOCKHOLM — Sweden’s chief epidemiologist said on Thursday that his country’s recently announced vaccine mandate for larger indoor events could well prove insufficient in slowing the spread of coronavirus and flagged that further measures may soon be needed. "If we have the continued low pressure from the virus which we have just now, then maybe proof of vaccination (for larger public gatherings) would be enough," Anders Tegnell, the architect of Sweden’s no-lockdown approach to the pandemic, told a press briefing in the Swedish capital Stockholm.