Measles cases are surging worldwide, with 11 million infections reported last year alone. The World Health Organization says the once-achievable goal of eliminating measles is now far from reach.

The WHO cites vaccination levels that are too low to protect many parts of the world. Health experts say 95% of people in a region must be vaccinated to achieve herd immunity and stop the spread.

"Without sustained attention, hard-fought gains can easily be lost," the WHO said. "Where children are unvaccinated, outbreaks occur. Based on current trends of measles vaccination coverage and incidence, the WHO Strategic Advisory Group of Experts on Immunization (SAGE) concluded that measles elimination is under threat, as the disease resurged in numerous countries that achieved, or were close to achi

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