Whether grilled, spicy with bell peppers or breaded in flour and fried floating in oil – the carp is one of the most popular edible fish. A dreaded threat to the up to 15 kilos fried fish: the koi herpes virus (KHV). It can be dormant in the carp for months before the most deadly KHV infection erupts – enough time to infect numerous other farmed fish. Together with three other partners, Fraunhofer researchers have now developed a process that will help diagnose the virus more reliably and accurately.