The suggestion by head of China's Center for Disease Control and Prevention marks the first time a top Chinese expert has publicly alluded to the relatively low efficacy of the country's vaccines.
With delays in global production and distribution, mixing two doses of vaccines may end up becoming inevitable. But questions concerning its safety and efficacy remain unanswered.
Finnish nurse's method to reduce medical waste and increase the number of jabs per Covid-19 vaccination bottle may also help other EU countries who are currently struggling with delays.
The scientists used spent vials of the Moderna vaccine to reverse-engineer its mRNA sequences.
Scientists have yet to agree on whether this is a cause for alarm yet.
Some countries have opened doors for the private sector to get in on the vaccine drive.
Independent advisers to the FDA began daylong discussions on whether to allow widespread use of Johnson & Johnson’s vaccine, setting the stage for a final decision within days.
The drugmakers also reaffirmed their commitments to supply more than enough doses necessary to vaccinate all Americans by the end of July.
The mass Covid-19 inoculation drive in the country of nine million people has seen 3.8 million people receive a first dose with 2.4 million fully vaccinated with a second shot.
As vaccination drives face supply bottlenecks, experts underscore the importance of sharing vaccine patents and copyrights to ramp up global production.
Delays in sharing clinical trial data is one of the key reasons behind skepticism.
The Covid-19 pandemic has infected more than 102 million people around the world, with over 2.2 million fatalities. Here are developments for January 30:
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