With the shift to AppleCare+, Genius Bar staff will no longer have the option of offering free replacements, so customers who have been aware of Apple's informal replacement policy should be mindful of the change.
Prevention of TB involves both early treatment to reduce transmission and isolation of the infected person until they are no longer contagious. There is a vaccine against TB, but it is not used routinely in the U.S. because of efficacy issues and other problems.
Although your body may harbor the bacteria that cause tuberculosis, your immune system usually can prevent you from becoming sick. Latent TB. In this condition, you have a TB infection, but the bacteria remain in your body in an inactive state and cause no symptoms.