During a 2.5-month average follow-up period after the second dose, the study showed a 67 per cent lower risk of infection for the combination of AstraZeneca and Pfizer vaccine shots.
TACKLE included 903 participants in a 1:1 randomisation AZD7442 to placebo and the primary analysis was based on 822 participants.
The treatment, known as AZD7442, would be the first long-acting antibody combination to receive an emergency use authorization for COVID-19 prevention.
VaxEquity was founded in 2020 by Imperial's Professor Robin Shattock and Morningside Ventures to develop transformative RNA therapeutics using its next generation saRNA platform.
Currently, CoWin certificates mention the beneficiary's age based on the year of birth besides other details.
The expert said that such viruses, by their very nature tend to become less virulent over time, but there is no set timeframe for how long that would take.
The declaration follows Covishield, the Serum Institute of India manufactured Oxford/AstraZeneca vaccine, being added as eligible to an expanded UK travel advisory on Wednesday.
India, one of the largest troop-contributing countries to UN peacekeeping missions, had gifted 2,00,000 doses of AstraZeneca COVID-19 vaccines for UN peacekeepers across all UN missions.
Only 20% of adults in Bulgaria, which has a population of 7 million, have so far been fully vaccinated.
With Oxford/AstraZeneca, being administered in India as Covishield, the fall was from 77 per cent to 67 per cent at four to five months.
The research found that the overall mortality rate of those presenting to hospitals with definite or probable VITT was 23 per cent.
Iranian President Ebrahim Raisi said he is opposed to the creation of insecurity in the region, adding: "The presence of Americans in the region, including Afghanistan, has not provided security."
A network of 65 Facebook accounts and 243 Instagram accounts was traced back to Fazze, an advertising and marketing firm registered in the United Kingdom.
The first batch consisting of 513,420 doses of the Japan-made vaccine arrived on a Qatar Airways flight in Tribhuvan International Airport, Kathmandu on Saturday, said the health ministry.
The Japanese donation follows a personal request made by Sri Lanka president Gotabaya Rajapaksa to the Japan prime minister Yoshihide Suga, said a statement from the president's office.