As China struggles to contain the spread of Covid-19, it's scientists race against time to upgrade existing vaccines.
Faced with limited Covid-19 vaccine supplies, many countries chose to delay the administration of the second doses. Here’s the science behind the delay and timing of the jabs.
The World Health Organization has said that any Covid-19 vaccines it has authorised for emergency use should be recognised by countries as they open up their borders to inoculated travellers.
Outbreaks in several countries are raising questions over the effectiveness of Sinovac and Sinopharm vaccines against more infectious Covid-19 variants.
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.
Russia's shuttle diplomacy around the Middle East projects is an attempt to project power as the US looks to re-calibrate its approach in the region.
Some countries have opened doors for the private sector to get in on the vaccine drive.
As vaccination drives face supply bottlenecks, experts underscore the importance of sharing vaccine patents and copyrights to ramp up global production.
The country of 216 million people has yet to secure substantial volumes of vaccines for mass inoculation, with only 500,000 doses of the Sinopharm vaccine donated by China thus far.
Delays in sharing clinical trial data is one of the key reasons behind skepticism.
The criminal group was manufacturing and selling fake vaccines, made of a simple saline solution, in China and to other countries.
The novel coronavirus pandemic has infected more than 100 million people around the world, with over 2.1 million fatalities. Here are updates for January 26:
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