(CNN) - Sri Lanka has defied the global trend in the battle against measles, with the country declared free of the highly infectious disease by the World Health Organization on Tuesday.
Sporadic cases reported in the last three years were imported from abroad but were quickly detected, investigated and received a rapid response, WHO added.
This year, the United States, where measles was declared eliminated in 2000, has experienced the highest number of measles cases since 1992.
However, the global health body said that Sri Lanka would have to remain vigilant to keep its measles-free status.
"The risk of importations of measles virus from countries near and far will remain, specially from those that have significant population movement with Sri Lanka," Singh said.