The global spread of dengue virus has immunologists and public-health experts debating the best way to curb infection.
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During development, communication between organs determines their relative final size.
One of the most advanced tuberculosis vaccines has failed to protect infants from getting the disease in a clinical trial, but it may be effective in adults.
Collective cell migration relies on a directional signal that comes from the moving cluster, rather than from external cues.
Watch the cell transplant experiments in zebrafish that suggest certain embryonic cells rely on intrinsic directional cues for collective migration.
Just 3 days after five people involved in the polio vaccine effort in Pakistan were shot by unidentified assailants, three more are killed.
Five workers at anti-polio campaigns were shot at close range this week, creating a major setback for efforts to prevent the crippling disease.
The science images and videos that captured our attention in 2012
The malaria vaccine under development by GSK and the PATH initiative only protects about one in three babies, though some researchers say those odds are better than nothing.
A third dose of the MMR vaccine given during an intense outbreak appears to have provided herd-immunity to control the spread of the disease.
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