Rochelle Walensky, CDC director (AP Images)

Delta vari­ant's rapid rise — now spurring 83% of new cas­es — sends stocks spi­ral­ing in what CDC di­rec­tor calls a 'pan­dem­ic of the un­vac­ci­nat­ed'

As the US emerges from a year­long lock­down, the Delta vari­ant — the most con­ta­gious strain of the nov­el coro­n­avirus iden­ti­fied to date — con­tin­ues to spread rapid­ly around the world, threat­en­ing to de­rail hopes for a swift eco­nom­ic come­back and bring­ing po­ten­tial boost­er shots to the fore­front of dis­cus­sion.

The Delta vari­ant, al­so known as B.1.617.2, is now re­spon­si­ble for about 83% of all Covid-19 cas­es in the US, CDC di­rec­tor Rochelle Walen­sky said dur­ing a Sen­ate health com­mit­tee hear­ing Tues­day. NI­AID di­rec­tor An­tho­ny Fau­ci said the strain, which was first iden­ti­fied in In­dia, ac­counts for up to 90% of cas­es in some US re­gions and has spread to about 100 coun­tries so far.

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