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Sam Fazeli

What Makes the Delta Virus Variant So Worrisome?

Vaccines provide protection against even this most concerning variant, but those who refuse shots or lack access are at greater risk, especially as economies reopen.

The delta variant should put us all on notice.

The delta variant should put us all on notice.

Photographer: Oli Scarff/AFP via Getty Images

As nations race to roll out vaccines in the global effort to contain Covid-19 and allow for a return to normal, the rise of dangerous virus variants threatens to prolong the pandemic. In the U.K., the spread of the so-called delta variant, first identified in India, has led officials to send military personnel to hotspots and prompted the government to reconsider easing Covid restrictions on June 21 as planned. Here, Sam Fazeli, a Bloomberg Opinion contributor who covers the pharmaceutical industry for Bloomberg Intelligence, answers questions about the risks stemming from this variant and more. The conversation has been edited and condensed.

What sets the delta variant apart from other variants and what makes it so concerning?