Stock Photo - A sign that reads 'Keep closed' on a door pictured in the secured rooms of the Insect Pest Control at the International Atomic Energy Agency in Seibersdorf, Austria, 10 February 2016. Male insects, which transmit diseases such as Zika, Dengue and yellow fever, are to be sterilised at this location. Photo: JAN GOTT/dpa | usage worldwide. - Seibersdorf/Austria

Stock Photo: A sign that reads 'Keep closed' on a door pictured in the secured rooms of the Insect Pest Control at the International Atomic Energy Agency in Seibersdorf.

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