Transparency is essential. The Malaysian authorities went to some lengths to inform people that the trials were going ahead, holding open forums and briefing the media, which gave the experiments wide coverage. [...] By contrast, efforts by the Cayman Island authorities seem to have amounted to not much more than producing little-reported leaflets and a video, posted on YouTube and broadcast on television, which failed to say that the mosquitoes were genetically modified — the main concern of critics. [...] Oxitec acknowledges that there are lessons to learn from its experiences. Best placed to judge the results of this are the people of Brazil, the planned site of the company’s next experiment.