A potentially worrisome variant of the coronavirus detected in India may spread more easily. But the country is behind in doing the kind of testing needed to track it and understand it better.

On Monday, the World Health Organization designated the new version of the virus a “variant of concern” based on preliminary research, alongside those that were first detected in Britain, South Africa and Brazil but have spread to other countries.

“We need much more information about this virus variant,” said Maria Van Kerkhove, WHO’s technical lead for the coronavirus disease 2019 (Covid-19). “We need more sequencing, targeted sequencing to be done and to be shared in India and elsewhere so that we know how much of this virus is circulating.”

Viruses mutate constantly, and the surge in infections here has resulted in more opportunities for new versions to emerge.

But India was slow to start the genetic monitoring needed to see if those changes were happening and if they were making Covid-19 more infectious or deadly.

Such variants also need to be monitored to see if mutations help the virus escape the immune system, potentially leading to reinfections or making vaccines less effective. For now, the WHO stressed that Covid-19 vaccines are effective at preventing disease and death in people infected with the variant.

Indian scientists say their work has been hindered by bureaucratic obstacles and the government’s reluctance to share vital data. India is sequencing around 1 percent of its total cases, and not all of the results are uploaded to the global database of coronavirus genomes.

When there isn’t enough sequencing, there will be blind spots and more worrisome mutations could go undetected until they’re widespread, said Alina Chan, a postdoctoral researcher at Broad Institute of MIT and Harvard who is tracking global sequencing efforts.

Ravindra Gupta, a professor of clinical microbiology at the University of Cambridge, said: “It has all the hallmarks of the virus that we should be worried about.”

First detected in the coastal Maharashtra state last year, the new variant has now been found in samples in 19 of the 27 states surveyed. Meanwhile a variant first detected in Britain has declined in India in the past 45 days.

Indian health officials have cautioned that it is too soon to attribute the nation’s surge solely to such variants. Experts point out that the spread was catalyzed by government decisions to not pause religious gatherings and crowded election rallies.

Dr. Gagandeep Kang, who studies microorganisms at Christian Medical College at Vellore in southern India, said researchers need to figure out if the variant is capable of infecting those who previously had Covid-19 and, if so, whether it could result in severe disease.

“I don’t get why people don’t see this as important,” she said.