Both Pfizer and BioNTech are coordinating with the Norwegian drugs regulator to ascertain the cause behind the deaths of the 23 elderly persons and the former has said that the incident is not alarming and “in line with expectations."

Prime Minister Jacinda Ardern announced the strategy on Monday, saying the decision was based on the Pfizer vaccine’s effectiveness. She said this would make it easier and fairer for all New Zealanders to have access to the same vaccine.

Researchers say more data is needed to determine whether protection lasts after six months.

Global tenders for vaccines issued by the Uttarakhand government and Mumbai’s civic body had also specifically barred companies from neighbouring countries.

From January to June, the vaccines as claimed remained effective around 90 per cent, but began dipping in June and largely dropped in July as the variant took hold in the US.

The expected change comes with headaches for receiving countries that lack sufficient cold storage capacity to handle the Pfizer vaccine, and amid risks of a shortage of syringes needed to administer that shot.

The CDC also highlighted that this new finding indicates that additional dose or a fourth dose may be required to enhance protection.

The centre, the first in Asia, will be a part of a network of 12 such facilities to be set up worldwide

The authorization makes everyone in the United States aged five and above eligible for booster doses of the vaccine.

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