Higher transmissibility, severity: What makes delta virus strain worrisome?

The best solution against the variant, first identified in India, is to test, isolate positive cases and vaccinate, says Sam Fazeli.

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