Medical entomologist Bart Knols of the University of Amsterdam worries that surprises such as the releases in Grand Cayman and Malaysia may erode public trust and provide anti-GM groups with ammunition.
Helen Wallace of the advocacy group GeneWatch UK says the lack of communication does little to instill confidence in Oxitec.
The aim of this GM technology is for the GM male mosquitoes to mate with wild female mosquitoes. They are genetically modified so that most of their offspring die before becoming adults. The hope is that this will reduce the population of Aedes aegypti mosquitoes, which carry the dengue virus, and hence reduce incidences of dengue fever.