On Saturday, more than 234,000 new infections were detected in the country nationwide. This is a rate of 127 cases per million people, compared to 23 per million in the UK.
Neighbouring Bangladesh and Pakistan, however, are included on the list despite their outbreaks being only a third of the size.
The news was confirmed in the weekly report of Public Health England (PHE), as some cases were reported under the Variants of Concern (VOC) and VUI in the UK.
A "double mutant" COVID-19 variant that emerged in India could bring about "increased transmissibility" or even "reduced neutralization" due to the specific mutations that it contains, a World Health Organization (WHO) official said on Friday.
It is the first time PHE has reported the variant in the United Kingdom, said a report by The Guardian.
"There is still no clear information on the variant or its effect on the vaccinated and recovered", a ministry statement said.
Variations of the virus crop up all the time and when cases first appear it is hard to tell if they are significant or not, or whether there is any trend.
"All variants are starting to be seen across India also". PHE officials knew that variant was spreading in Britain in December but didn't start testing communities to weed it out until February.
Recently, health experts said the double mutant variant may be less risky than expected as the most vulnerable patients are having only mild illnesses.
Concerns have been raised that in combination, these two mutations make the strain potentially more infectious and better at evading antibodies gained from prior infections or vaccinations.
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This was first detected and reported by India, it has two mutations: the E484Q and the L452R.
Prof Altmann said he found it "mystifying" and "slightly confounding" that those arriving from India are not subject to a hotel quarantine. "I think we're going to go on seeing restrictions on travel for some time to come, with the pandemic raging in so many countries around the world", he told Times Radio.
A staggering 175,910 new cases were diagnosed yesterday, nearly treble the 65,000 cases on April 1. Now, a bulk of events will be fit in a packed one-day trip on April 26.
A Downing Street spokesperson said the government's red list of travel ban countries is "under constant review", when asked why India didn't feature on it.
Holidaymakers or people without a legal right to be in Britain will be turned away at the border, while others must quarantine in a hotel at their own expense.
When and where was it discovered?
The B.1.617 variant has been detected in 11 countries, according to the tracker.
What mutations does it have?
The variant - officially named B.1.617 - is nearly certainly playing a part in the very sharp spike in the epidemic in India.
The gathering in Haridwar has attracted as many as 25 million people since January, including some 4.6 million this week alone, with most people ignoring Covid-19 guidelines. Their locations are unknown.