Readers comment on TB vaccines and more

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Delivering a tuberculosis vaccine intravenously instead of under the skin improved its effectiveness, Tara Haelle reported in “Injecting a TB vaccine into the blood, not the skin, boosts its effectiveness” (SN: 2/1/20, p. 12). 

“My main takeaway from this article is that something as big as bacteria can get inside of a cell,” reader Mike Hamm wrote.