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be taken in context. reporter: should we concerned about vaccine efficacy when it comes to the plus variant? the delta is enough to worry about. reporter: even without the one additional mutation the delta variant say formidable enemy. the strain is set to become the most dominant one globally and the u.s. is braced for impact. the delta variant is currently the greatest threat in the u.s. to our attempt to eliminate covid-19. reporter: the british government delayed the easing of restrictions, largely due to the variant. as tourism season begins, europe is watching nervously. eu modeling forecasts the delta variant will make up 90% of infections in the block by the end of august. but as the virus morphs and mutates, experts say the best defense against it remains the same, vaccination.

Vaccine efficacyUnited statesDelta variantBreaching covidBritish governmentTourism seasonThe end of augustVirus morphs