Now Covid hospitalisation rates are slowing! Experts hail 'clear signs' ...

India has declared a 'Delta plus' Covid variant to be of concern, amid fears it may evade vaccines more than the original variety.

The mutant strain — sometimes known as AY.1, or the Nepal variant — has already spread to three states, despite attempts to suppress it.

Health chiefs in India who are assessing the country's coronavirus crisis have now elevated it from being a variant of 'interest' to one of 'concern'.

It carries the K417N mutation — also seen in the South Africa 'Beta' variant — which can help the virus dodge immunity from vaccines and natural infection.

The evolved virus — which has the same features of the original highly-transmissible Indian type — has been spotted in 52 times in the UK.

But experts have cast doubts on whether Delta plus should even be considered its own variant.

Professor Francois Balloux, head of University College London's Genetics Institute, said the K417N had cropped up in several different lineages.

SARS-CoV-2, the coronavirus behind Covid, is constantly evolving as it spreads, and most mutations it picks up tend to have little effect.

However, if it finds one that offers it a benefit — such as making it extra infectious or better equipped to dodge the immune system — it can crop up repeatedly.

Professor Balloux said none of the variants carrying the K417N have been particularly successful so far, other than the South Africa variant.

The current crop of vaccines in use are less effective against the 'Beta' variant, data has shown but AstraZeneca is developing a vaccine specifically designed to counter the strain which the UK is in negotiations for.

There is no proof Delta plus — spotted in five countries so far — poses any greater threat than the strain it evolved from.

Experts believe the original Indian variant is around 60 per cent more transmissible than the previously dominant Kent 'Alpha' strain.

It also makes people more likely to be hospitalised, according to Public Health England.

Vaccines are still effective against the variant but one dose is less so at blocking symptoms and severe illness.

Writing on social media today, Professor Balloux said the Nepal strain has only been sequenced 160 times across the world so far.

He said: 'It's not a proper "variant". It's the Delta B.1.617.2 strain carrying the K417N mutation in the spike protein.

'There have been around 160 strains sequenced to date. The first was found on April 5, 2021, in India.

'It has been found in several countries but at extremely low frequency, with the exception of Nepal where it has been estimated at around four per cent — but based on a tiny sample size of three in 70.

'Delta plus represents 0.00002 per cent of all delta variants sequenced to date. There is no evidence the strain is currently expanding in any country.'

Professor Balloux added: 'The K417N mutation has arisen independently in several viral lineages — at least twice in Delta.

'It was observed on the March 27, 2020, in a strain found in Qatar.

'K417N is generally present in the Beta variant. It seems to contribute to immune escape.

'Its impact on transmissibility is not clear-cut. None of the lineages carrying it —bar Beta — have been particularly successful so far.'

Professor Able Lawrence, an immunologist at the Sanjay Gandhi Postgraduate Institute of Medical Sciences in Lucknow, said the the current data did not seem to indicate the variant was spreading.

But he warned the strain could pose a threat to India and other countries around the world.

Professor Lawrence told The Times: 'There are too few cases to be able to say if it is more transmissible but it is showing the potential to evade vaccines so it has to be watched carefully.'

India's Federal Health Secretary Rajesh Bhushan yesterday told a news conference the Delta plus variant has infected 16 people in the state of Maharashtra.

Some 28 cases have been found in total across Maharashtra, Kerala and and Madhya Pradesh.

The Indian ministry said Delta plus showed increased transmissibility and advised states to increase testing.

On Monday, India vaccinated a record 8.6million people as it began offering free shots to all adults but experts doubted it could maintain that pace.

Chandrakant Lahariya, an expert in public policy and health systems, said: 'This is clearly not sustainable'.

'With such one-day drives, many states have consumed most of their current vaccine stocks, which will affect the vaccination in days to follow.'

With the currently projected vaccine supply for the next few months, the maximum daily achievable rate is four to five million doses, Dr Lahariya added.

The effort has so far covered about 5.5 per cent of the 950million people eligible, even though India is the world's largest vaccine producer.

A devastating second wave during April and May overwhelmed health services, killing hundreds of thousands. Images of funeral pyres blazing in car parks raised questions over the chaotic vaccine rollout.

Since May, vaccinations have averaged fewer than three million doses a day, far less than the 10million health officials say are crucial to protect the millions vulnerable to new surges.

Over the past 24 hours India reported 42,640 new infections, the lowest since

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