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This image provided by the University of Pittsburgh School of Medicine and the National Institute of Allergy and Infectious Diseases shows a collection of lung scans of 20 monkeys who were exposed to tuberculosis after receiving different forms of a TB vaccine. Monkeys in the top row received skin-deep shots, and those in the bottom row were given intravenous injections. The intravenous vaccine protected far better, as shown by TB-caused inflammation seen in red and yellow. (JoAnne Flynn, Alexander White and Pauline Maiello/Pitt; Mario Roederer/NIAID via AP)  **FILE**
Photo by: JoAnne Flynn Alexander White Pauline Maiello Mario Roederer
This image provided by the University of Pittsburgh School of Medicine and the National Institute of Allergy and Infectious Diseases shows a collection of lung scans of 20 monkeys who were exposed to tuberculosis after receiving different forms of a TB vaccine. Monkeys in the top row received skin-deep shots, and those in the bottom row were given intravenous injections. The intravenous vaccine protected far better, as shown by TB-caused inflammation seen in red and yellow. (JoAnne Flynn, Alexander White and Pauline Maiello/Pitt; Mario Roederer/NIAID via AP) **FILE**

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