image source, Getty Imagesimage captionCovishield is India's most widely used vaccine

UK's refusal to recognise the Indian-made version of the Astra Zeneca vaccine has triggered a firestorm of protests in India.

With more than 721 million doses administered so far, Covishield is India's most widely used vaccine.

In July, even the UK received five million doses of the jab from India.

India has described the move as "discriminatory" and asked UK to scrap a rule that requires fully-vaccinated Indians to self-isolate for 10 days.

At the moment, fully-vaccinated Indians travelling to Britain have to self-isolate for 10 days and book and take Covid-19 tests before they are allowed to move freely.

But recently, UK announced new rules – which will come into effect on 4 October – which mandate that travellers from several countries do not have to self-isolate if they are fully vaccinated.

But Indians are not included in that list which means that even those with two doses will be considered "not vaccinated" and will still have to self-isolate.

This is despite the fact that AstraZeneca's Covishield is among four vaccines listed by UK.

Prominent Indians have called the rule "highly discriminatory", "racist" and "asinine", among other things.

Foreign Minister S Jaishankar has taken up the matter "strongly" with his UK counterpart Liz Truss, according to India's foreign secretary Harsh Vardhan Shringla.

It is "a discriminatory policy and does impact our citizens travelling to the UK", Mr Shringla told reporters. He warned that India might take "reciprocal measures" if UK did not address India's concerns. Such measures generally include India imposing similar restrictions on those arriving from Britain.

A leading MP from the main opposition Congress party, Jairam Ramesh, tweeted that the "bizarre" decision "smacked of racism".

Absolutely bizarre considering Covishield was originally developed in the UK and The Serum Institute, Pune has supplied to that country too! This smacks of racism. https://t.co/GtKOzMgydf

— Jairam Ramesh (@Jairam_Ramesh) September 20, 2021
The BBC is not responsible for the content of external sites.View original tweet on Twitter

Others said the move appeared to be a "money making opportunity".

I feel it's just a money making opportunity. A fully vaccinated family friend just traveled to London on 7th, is there right now. D rules stipulate 8 days home quarantine – with 3 separate and very expensive home test kits that one has to buy n that are mailed to you.

— ProG (@Mrs_DoSoLittle) September 20, 2021
The BBC is not responsible for the content of external sites.View original tweet on Twitter

Shashi Tharoor, author and Congress party MP, said he had cancelled a planned tour to participate in a debate at Cambridge University and to promote his new book in protest against the move.

"Why should Indians be deemed to be lesser breeds than others? It is deeply offensive that fully vaccinated Indians have to quarantine, while others who may have taken the same vaccine in other countries, do not," Mr Tharoor wrote in The Quint.

"The UK has done its image in India a profound disservice by failing to offer clarity on the question at the heart of the issue," he added.

About 25% of adults in India have been fully vaccinated so far – an estimated 150 million have received both doses of Covishield at home.

Serum Institute of India – the world's biggest vaccine maker which makes the jab under licence from Astra Zeneca – has also supplied millions of doses to countries in Asia, Africa and South America under deals signed with various governments and as part of the global Covax scheme for poorer countries.

image source, Kaliprasadimage captionPune-based Serum Institute of India is the world's biggest vaccine maker

In July, British PM Boris Johnson said he was "very confident" there "will not prove to be a problem" for travellers who had received an Indian-made Covid jab. Downing Street said the UK's medicines regulator had shared its data on the jab with its European counterpart. Vaccine expert Prof Adam Finn said the vaccines – Astra Zeneca and Covishield – were "exactly the same stuff". And 23 countries of the European Union have approved the jab.

"There seems to be no obvious explanation [behind the rule]. Clearly different standards are at play, depending on which part of the world the traveller is coming from," says Amitabh Kant, CEO of Niti Aayog, an Indian government-backed think tank.

Did the move have something to do with some reports of fake vaccines? WHO had reported that counterfeit versions of Covishield were seized by authorities in India and Africa between July and August and called for their removal from circulation.

Or does the rule have to do something with India's "dodgy documentation", as Mr Tharoor quoted a source as telling him.

In other words, there were concerns about whether the vaccination certificates produced by Indian travellers were genuine or not.

Earlier this month, Check Point, a leading US-based cyber security company, reported that there was surging black market in vaccine certificates on Telegram in 28 countries. (This followed US President Joe Biden's vaccine mandate announcements.) In India, these certificates were selling for $75 apiece, the firm reported.

A spokesperson for the British High Commission in India told the BBC that its government was "working with India to expand recognition of vaccine certification".

Mr Tharoor says the Indian certificates carry QR codes which can be verified and there "may be some other ways of confirming tangible evidence" of their authenticity. "Making it such a stumbling block reeks of bad faith," he says.

Meanwhile, Indian travellers bound for the UK are distraught and say it is "ridiculous" to be in quarantine despite being fully vaccinated. Those who have travelled to Britain continue to self-isolate for 10 days and get tests done at their own cost.

"Why are they discriminating against our vaccines? This is all adding more stress to what is an already stressful time and adding to our costs," says Hema Anand, mother of a student who has travelled to the UK and is now in self-isolation.

media captionThe jungle-trekking Covid vaccinators helping to protect remote Indian villages.