British pharmaceutical giant AstraZeneca on Monday said an interim analysis of clinical trials showed its coronavirus vaccine has an average efficacy of 70% in protecting against the virus. One dosing regimen showed an effectiveness of 90% when trial participants received a half dose, followed by a full dose at least one month apart. The other showed 62% efficacy when given as two full doses at least one month apart. CNBC's Meg Tirrell reports. For access to live and exclusive video from CNBC subscribe to CNBC PRO: [ Ссылка ]

The coronavirus vaccine being developed by AstraZeneca and the University of Oxford was found to be “highly” protective, potentially paving the way for a vaccine that is more affordable and easier to distribute than some of its peers.

An interim analysis of clinical trials showed the Oxford-AstraZeneca vaccine had an average efficacy of 70% in protecting against the virus.

Researchers said this figure could be as high as 90% by tweaking the dose, but the overall results show the vaccine’s efficacy is slightly lower than other leading candidates.

Both Pfizer-BioNTech and Moderna reported preliminary results last week showing that their respective Covid vaccines were around 95% effective.

However, White House coronavirus advisor Dr. Anthony Fauci has previously said a vaccine that is 50% or 60% effective against the virus would be acceptable.

It is hoped a Covid vaccine could help to bring an end to the coronavirus pandemic that has claimed more than 1.3 million lives worldwide.

Huge challenges remain before a vaccine can be rolled out. The global battle to secure prospective supplies has raised concerns about equitable access, while questions remain over the logistics of mass production, distribution, and cost.

Equity analysts at Jefferies said it was “challenging” to compare the efficacy of AstraZeneca’s vaccine with those of Pfizer-BioNTech and Moderna, citing key differences in how the trials have been conducted.

The analysts highlighted weekly swabbing to detect Covid-19 among participants involved in AstraZeneca’s trials — not just confirmation of suspected cases by symptoms as in U.S. trials. They also stressed that a meningococcal vaccine was used for comparison, not placebo.

The Oxford-AstraZeneca vaccine was assessed over two dosing regimens. One showed an effectiveness of 90% when trial participants received a half dose, followed by a full dose at least one month later.

The other showed 62% efficacy when given as two full doses at least one month apart.

No hospitalizations or severe cases of the disease were reported in participants receiving the vaccine.

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