Oxford University’s research found that Pfizer and AstraZeneca vaccine efficacy fell to 78% and 61% respectively within 90 days after the second shot, but the lead scientist says both Covid-19 vaccines are still very effective against Delta overall.
Covid-19 inoculation with AstraZeneca first, followed by Pfizer, boosts neutralising antibodies by six times compared to two AstraZeneca shots, according to a South Korea study.
Malaysia maintains that Sinovac’s Covid-19 vaccine is effective, even as a Thai study found that antibody levels in people fully vaccinated with Sinovac halved every 40 days.
Ong Kian Ming says Malaysia should be more concerned about controlling its Covid-19 epidemic to avoid entering any country’s travel ban list, instead of vaccine passports.
The European Commission says EU countries "should" permit entry to people vaccinated with EU-authorised vaccines and that the vaccines don't have to be produced in EU-approved facilities, but it is ultimately up to EU member states to do so.
The European Medicines Agency’s approval for AstraZeneca’s Covid-19 vaccine does not cover AstraZeneca doses made by South Korea, Thailand, or Japan that supply Malaysia.
A Trinity College Dublin professor says the Oxford study indicates that shortening AstraZeneca's dosing interval will likely reduce, rather than enhance, vaccine effectiveness.