Thailand confirms first Zika-linked microcephaly of unknown cause in Southeast Asia | Reuters. Thailand confirms first Zika-linked microcephaly of unknown cause in Southeast Asia. Thailand confirms first Zika-linked microcephaly of unknown cause in Southeast Asia. A pile of silverfish city worker fumigates the situtation and the area to control company to do the spread of space to stick mosquitoes at a temple which were coming in Bangkok, Thailand, September 14, 2016. .