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16 Feb 2016 description

By Alex Whiting

LONDON, Feb 10 (Thomson Reuters Foundation) - Surveyors were taken hostage in Yemen, accused of being representatives of Dracula in Papua New Guinea, worked in sandstorms and temperatures of 50 degrees Celsius in Ethiopia.

It was all part of the day's work for some of the thousands of people who have completed what the organisers say is the largest ever survey of an infectious disease, examining 2.6 million people in 29 countries for the eye infection trachoma.