Readers comment on TB vaccines and more
Cellular hideout
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. The article states that the bacteria that cause tuberculosis enter cells, but bacteria are typically much larger than viruses that infect cells, he noted. “So how does something as big as bacteria get through?”