By Spy Uganda
It said preliminary studies show the B.1.617 mutation spreads more easily than other variants and requires further study.
The variant has already spread to more than 30 countries, the WHO says.
Three other variants from the UK, South Africa and Brazil have been given the same designation.
According to WHO, a mutation is elevated from a “variant of interest” to a “variant of concern” (VOC) when it shows evidence of fulfilling at least one of several criteria, including easy transmission, more severe illness, reduced neutralization by antibodies or reduced effectiveness of treatment and vaccines.
The variant is being studied to establish whether it is responsible for a deadly surge in India, which is currently overwhelming hospitals and crematoriums.
India reported 366,161 new infections and 3,754 deaths on Monday, down from record peaks. Experts say the actual figures could be far higher than reported.
Surging cases have left the country with oxygen shortages continue to be a problem and have spread beyond the capital, Delhi.
The Indian government says there is evidence of a link between the variant and India’s deadly second wave, but that the correlation is not yet “fully established”.
However, Prime Minister Narendra Modi’s government is coming under increasing pressure to announce a nationwide lockdown and stop the spread of the virus.
He is also facing criticism for allowing massive gatherings at Hindu festivals and election rallies to go ahead despite rising cases.
On Monday, Delhi’s health minister said the capital had just three or four days of vaccine supplies left.
Shortages are further disrupting a lagging vaccination programme, with just over 34.8 million, or about 2.5% of the population receiving both doses of a vaccine so far.
The WHO says current vaccines will continue to be effective against the Indian variant, although the WHO’s technical lead did say there may be some evidence of “reduced neutralization,” at a press conference on Monday.