No new threat led to airline laptop limits, officials say

U.S. and British officials said Tuesday the decision to bar laptops and tablets from the cabins of some international flights wasn't based on any specific threat but on longstanding concerns about terrorists targeting jetliners.

HIV co-infection influences natural selection on M. tuberculosis

Tuberculosis (TB) remains a major global health problem, with 10 million cases and 2 million deaths per year, according to the World Health Organization. The only available vaccine is effective in children but its effect ...

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