However, the Oxford jab is cheaper and easier to store and therefore better to get to every corner of the world than the other two.
It is thought that by tweaking the dosage, the protection rate could go up to 90%, as was seen in analysis of about 3,000 people who were given a half-sized first dose and a full-sized second dose.
Among construction project workers, diplomats and students who went overseas after taking Sinopharm's vaccine, no one has been infected, Liu said.
It will be for the JCVI to consider the vaccine that has been developed by the University of Oxford team, after it has been looked into and checked by regulators.
Perna said that 64 jurisdictions across the USA - including the 50 states, territories like the capital Washington and Puerto Rico and Indian reservations - received their allocation numbers on Friday.
The working group, which would include less than a dozen medical experts, would advise the state's COVID-19 vaccine advisory board on vaccine distribution and independently evaluate the safety and efficacy of a COVID immunization when it becomes available, MassLive has learned.
But the announcement of any new vaccines will not impact on Guernsey's vaccination planning.
On November 6, during the 3rd China International Import Expo held in Shanghai, Liu said that the company will be able to produce 100 million doses by the end of this year, and the production capacity will exceed one billion doses next year, which will meet domestic demand for the vaccines.
Latest figures on Tuesday showed that the country had recorded a total of 259,600 Covid deaths and 12.5 million cases - with over 2,000 deaths and 167,000 new cases in just the last 24 hours.
A committee of the Food and Drug Administration meets on December 10 to decide whether to green light the medicine, with the U.S. confronted by soaring numbers of deaths and new cases.