India, already hit hard by the Delta variant of COVID-19, has labeled a closely related new variant—dubbed “Delta Plus”—as a “variant of concern.” But some epidemiologists in India and abroad say there is not enough data yet to warrant broader cautions about the variant, CBS News reported.

Delta Plus cases are rising in India, and the variant has also been spotted in COVID-19 patients in the United States, United Kingdom, China, Japan, Poland, Portugal, Russia, and Switzerland.

On Tuesday, India said more than 40 cases of Delta Plus (officially called B.1.617.2.1) were found across three states—Maharashtra, Kerala, and Madhya Pradesh. A group of labs in India have studied the new variant and report that it appears to have three troubling characteristics: increased transmissibility, better ability to infect cells in the lungs, and a potential for higher resistance to vaccines or immunity gained through prior infection.

Jeremy Kamil, Ph.D., a virologist at the Louisiana State University Health Sciences Center, told BBC News that there is not “much reason to believe this [Delta Plus] is any more dangerous than the original Delta.”

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