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>> thanks so much for tracking that, derek van dam, appreciate it. the u.s. fight against the coronavirus pandemic is getting more complicated because of the highly contagious delta variant. the strain is the likely driver for 10% rise in u.s. infections this week compared to the week before. experts say it's hitting states with the lowest vaccination rates the hardest. right now nearly half of the u.s. population is fully inoculated, not enough to reach herd immunity which happens when 70% to 85% of people are immune to the disease. the delta variant could make the threshold reaching it harder. in california the strain is responsible for more than a third of new infections. officials are asking people to wear masks in public indoor spaces even if they are fully vaccinated. listen to this.