A 4-month-old baby born with microcephaly is held by his mother in front of their house in Olinda, near Recife, Brazil, February 11, 2016. REUTERS/Nacho Doce/File Photo

Migrants walk in the night along the highway towards the border with Austria, some 22 km of Budapest, Hungary, September 4, 2015. REUTERS/Laszlo Balogh

A man crosses a road in the rain at a commercial district in Tokyo, Japan, August 18, 2016. REUTERS/Kim Kyung-Hoon

Cranes at a construction site are pictured in Tokyo, Japan, August 21, 2016. REUTERS/Kim Kyung-Hoon

A man stands next to an electronic board showing stock prices in Tokyo, Japan, August 18, 2016. REUTERS/Kim Kyung-Hoon

A crane a construction site is pictured in Tokyo, Japan, August 21, 2016. REUTERS/Kim Kyung-Hoon

Factory chimneys are seen at Keihin industrial zone in Kawasaki, south of Tokyo, Japan, August 18, 2016. REUTERS/Kim Kyung-Hoon

A bicycle rider rides past a factory at Keihin industrial zone in Kawasaki, south of Tokyo, Japan, August 18, 2016. REUTERS/Kim Kyung-Hoon