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Tipping point. meanwhile concerns are mounting over the covid deta variant. this comes after an alarming report of a child who died. it s calling on the vaccine s effectiveness against the delta strain. nbc s gabe gutierrez has the latest. reporter: as the u.s. sees a thousand new covid cases every hour, a new study suggests that the one shot, johnson & johnson vaccine may be less effective against the delta variant and those who received it may need a booster. the cdk does not recommend it. the study is facing a backlash. j&j says its own study shows its vaccine offers strong protection. this is a small study done in a laboratory, not in the real ....