In addition to the protection offered against symptomatic Covid-19, PHE said it expected to see even higher levels of effectiveness against hospital admissions and deaths.
The data showed getting both doses of the vaccine was "absolutely vital", he added. The World Health Organization said the predominant lineage of B.1.617 was first identified in India last December, although an earlier version was spotted in October 2020.
PHE said a first dose of both vaccines was 33% effective against symptomatic disease from B.1.617.2 after three weeks, lower than its 50% effectiveness against B.1.1.7.
"This data shows the vaccine after two doses works just as effectively, and we all know that the vaccine is our way out of this", Hancock said, according to Sky News.
A government source told Reuters the notice was issued to send a message "loud and clear" that such mentions of "Indian variant" spread miscommunication and hurt the country's image.
Despite these efforts the USA still lags behind more than 20 other countries in terms of having a clear idea of how many variant cases there are, according to the latest ranking by GISAID, an global group that promotes the rapid sharing of data from the coronavirus that causes COVID-19.
Second, the proportion of cases with the B.1.617.2 variant relative to the main circulating virus (the B.1.1.7 variant) was estimated by vaccination status.
She said: "One week post the last restriction lifting, we will be monitoring it very carefully".
The Indian Expressreported on May 21 that scientists across various institutions under the Indian SARS-CoV-2 Genomics Consortium (INSACOG) have said that the B.1.617.2 variant was beginning to take over as the dominant "variant of concern" in the country.
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.
'Given the size of our unvaccinated population and the apparent transmissibility of this variant, we would encourage people to remain vigilant and to continue to adhere to the public health guidance as the vaccine programme rolls out'.
A further 2,874 lab-confirmed cases were confirmed on Thursday, the highest daily figure for new infections since April 19.
The head of NHS Test and Trace has urged people to get their second jab during an interview on The Andrew Mar show.
The Indian variant certainly gives the virus a bit more of an advantage, but it doesn't mean the vaccines won't win out.
The study involved 12,675 cases being looked at, and took place between 5 April and 16.
There are insufficient cases and follow-up periods to estimate vaccine effectiveness against severe outcomes from the Indian variant but this will be evaluated over the coming weeks, PHE added.
This point was backed by Dr Susan Hopkins, Covid-19 strategic response director for PHE. Most people with the India variant in areas around Bolton had not been vaccinated.
When will the border reopen between Canada and US?
The FDA granted emergency use authorization to the Pfizer/BioNTech and Moderna vaccines in December. Sadarangani said the research deadline for the federally funded project was "as soon as possible".