Indian Community health volunteers verbally screen high risk populations for TB.
SANJAY BAID/EPA-EFE
In high-income countries people at high risk of TB disease undergo screening programmes even when they have no symptoms.
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Scientists have struggled to diagnose TB in people with compromised immune systems because of the low levels of the bacteria in their body.
One-third of the world’s population is latently infected with the bacteria that cause tuberculosis.
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Scientists have found proteins in the body that promote lung inflammation which helps the bacteria that causes TB to spread throughout the lung.