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A coronavirus variant first found in India is now officially a ‘variant of concern,’ the W.H.O. said.

Experts caution that it’s not yet clear just how much of a factor that the variant, B.1.617, has played in the catastrophic rise in cases in India, which are likely undercounted.

Funeral pyres of coronavirus victims at a makeshift crematorium in New Delhi on Sunday.Credit...Anindito Mukherjee/Getty Images

Amid a deepening crisis in India, the World Health Organization announced Monday that it had designated the B.1.617 variant, which has been growing more common in the country, as a variant of concern. Scientists still don’t know much about the variant, but they are worried that it might be helping to fuel the rise in the nation’s coronavirus infections, which experts say are probably undercounted.

“There is increased transmissibility demonstrated by some preliminary studies” of the variant, said Dr. Maria Van Kerkhove, the technical lead of the W.H.O.’s coronavirus response.

Dr. Van Kerkhove also said that a study of a limited number of patients, which had not yet been peer-reviewed, suggested that antibodies from vaccines or infections with other variants might not be quite as effective against B.1.617. However, the agency said that vaccines were likely to remain potent enough to provide protection against B.1.617.

More details will be released in a report on Tuesday, Dr. Van Kerkhove said.

The variant was first detected in India at the end of 2020 but became more common in the country starting in March. It has since been found in 32 countries including the United States and the United Kingdom. The W.H.O.’s announcement comes as growing numbers of medical experts are adding their voices to a chorus of condemnation of the Indian government’s response and calling for nationwide restrictions to try to limit the horrifying death toll.

Although the official figures are already staggering — more than 350,000 new infections daily this month and nearly 250,000 total deaths — some experts say that the numbers are a vast undercount and estimate that India is on pace to suffer more than one million deaths by August.

Initially, the W.H.O. classified B.1.617 as a “variant of interest,” because it had certain mutations that had been linked to higher transmission and the potential to evade vaccines. At a news conference on Monday, agency officials announced that they were elevating it to a higher level.

Other variants of concern include B.1.1.7, which was first identified in the United Kingdom, and P.1, which was originally detected in Brazil.

But experts caution that it is not yet clear just how much of a factor B.1.617 has played in the catastrophic rise in cases in India. They point to a perfect storm of public health blunders, such as permitting enormous political rallies and religious festivals in recent months.

“I am concerned about 617 — I think we have to keep a very close eye on it,” said Kristian Andersen, a virologist at Scripps Research Institute in La Jolla, California. But he cautioned that relatively few variant samples were being analyzed in India, making it hard to know just how dangerous B.1.617 is. “We really, really need better data out of India,” he said.

Carl Zimmer writes the “Matter” column. He is the author of fourteen books, including “Life's Edge: The Search For What It Means To Be Alive.” More about Carl Zimmer

Daniel E. Slotnik is a general assignment reporter on the Metro desk and a 2020 New York Times reporting fellow. More about Daniel E. Slotnik

Karan Deep Singh is a reporter and visual journalist based in New Delhi, India. He previously worked for The Wall Street Journal, where he was part of a team that was named a finalist for the 2020 Pulitzer Prize in Investigative Reporting and nominated for a national Emmy Award. More about Karan Deep Singh

A version of this article appears in print on  , Section A, Page 6 of the New York edition with the headline: W.H.O. Observes ‘Variant of Concern’ As Virus Rampages Through India. Order Reprints | Today’s Paper | Subscribe

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