The recently-released United Kingdom study by Public Health England found both the Pfizer vaccine, authorized for use in the US on an emergency basis, and the AstraZeneca Plc shot, which isn't yet available in the USA, to be "highly effective" against the B.1.617.2 form of the variant first detected in India.
The PHE said it expects to see even higher levels of effectiveness against hospital admissions and deaths.
Two doses of the AstraZeneca vaccine were 60 percent effective against symptomatic disease from the Indian variant compared with 66 percent effectiveness against the Kent variant, PHE said.
"From everything I can tell the vaccines are highly effective against this variant", said Samuel Scarpino, a co-founder of Global.health, an organization that tracks Covid cases and variants internationally.
India's Ministry of Electronics and IT (MEITY) issued an advisory on May 21 addressed to "all social media platforms", demanding that they not identify the B.1.617 variant of the novel coronavirus as the "Indian variant".
PHE said the difference in the effectiveness between the vaccines may be due to the AstraZeneca second dose being rolled out later than the Pfizer vaccine.
According to Reuters, the letter said: "There is no such variant of Covid-19 scientifically cited as such by the World Health Organisation (WHO)".
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The study said they couldn't estimate the effectiveness of the Moderna vaccine because the number of recipients was too small.
Dr Cillian de Gascun, Medical Virologist and Director of the National Virus Reference Laboratory, also sounded the alarm bell about the new Indian mutation stating: 'The B.1.617.2 variant continues to increase, with 72 cases now identified in Ireland.
The study included data for all age groups from April 5th to cover the period since the variant emerged.
Of over 20,000 samples of SARS-CoV-2 sequenced from across states, the consortium has identified variants of concern in 8,000 samples, with B.1.617 being the "dominant" one.
The Indian coronavirus variant can be suppressed by vaccines that have already been put to use according to a study published on Saturday in England. However, the country has been reeling from a crippling vaccine shortage, and the increase in the inter-dose gap was conveniently also a way to buy time for additional supply.
Prof Susan Hopkins, PHE's Covid-19 strategic response director, said the data trend was "quite clear" and was heading in the "right direction".
Mr Fell said in his statement: "We have been monitoring VUI-21MAY-01 and we're managing this carefully as we do with all outbreaks across the city".
"PHE will continue to monitor all variants closely, paying particular attention to the impact on hospitalisations and deaths which will help us to understand the protective effects of the vaccine". "Fully vaccinated" in this context means that a person has received two doses of the vaccine, and two full weeks have passed since their last shot.