Why the US measles review matters as experts warn of wider risk

The re-evaluation is largely symbolic, contingent on whether a single measles chain has spread uninterrupted within the ...

The US is on the verge of losing its measles elimination status. Here's why that matters

But under PAHO's definition of elimination, borders matter. If, for example, the chain of measles that started in the U.S. spread to Mexico and then returned to the U.S. anew, it would be considered a ...