"The situation was different with the AstraZeneca vaccine, which induced particularly low levels of antibodies neutralising" the Indian variant, the study said.
Pakistan has opened up vaccination for Pakistani, who are 30 years or above, from tomorrow, according to a recent tweet by Federal Minister for Planning, Development, Reform and Special Initiatives Asad Umar.
Two mass vaccination centres operated by the military in Tokyo and Osaka will open next week and are expected to administer the two-shot Moderna vaccine, initially to the elderly.
The southern African country has so far received three batches of the AstraZeneca vaccine -- 300,000 doses under the Covax vaccine sharing facility, 50,000 from India and 102,000 from the African Union.
The European Union has agreed to reopen its borders to fully vaccinated travellers.
Furthermore, meeting in Brussels, representatives and diplomats agreed to raise the threshold of new cases a country can hit before being declared unsafe.
An upcoming study by Oxford University showed that a third dose of the vaccine boosted antibodies to the coronavirus spike protein among participants, it added.
About 1.4 million in the country of 5.7 million have received both vaccine doses, with efforts so far focusing on vulnerable groups, frontline workers, and those above 45.
He said that 1345 elderly people were given a second dose of Cyano form vaccine and in the last 24 hours, 67 health workers were given the first dose of Synovik.
Earlier, Alberta -- with the highest per capita number of Covid cases of any Canadian province or US state -- altered its immunization strategy, saying it wasn't sure when it would receive additional shipments of the AstraZeneca vaccine.
"The aim of this study is to explore the regulatory pathway that BioNTech and Pfizer would pursue if SARS-CoV-2 were to change enough to require an updated vaccine," it said.
Reserve Bank of India governor Shaktikanta Das said cheap loans would be available until March 31 next year, and vowed to deploy "unconventional" measures if the crisis worsens.
President Joe Biden said Tuesday he had not made a decision on whether to support a vaccine waiver, but that the United States was moving "as quickly as we can" to export doses.
Pfizer has earned $3.5 billion in the first quarter of 2021, as the ramped up sales of the COVID-19 vaccine boosted its projected annual earnings to $26 billion.
The American pharmaceutical company announced on Tuesday that it has raised its annual revenue guidance to up to $72.5 billion, up from $61.4 billion, predominantly due to the contractual delivery of 1.6 billion vaccine doses in 2021.