The World Health Organization has approved a version of a widely used cholera vaccine that could help address a surge in cases that has depleted the global vaccine stockpile and left poorer countries scrambling to contain epidemics.

WHO authorized the vaccine, made by EuBiologics, which also makes the formulation now used, last week. The new version, called Euvichol-S, is a simplified formula that uses fewer ingredients, is cheaper, and can be made more quickly than the old version.