Winter is influenza season. In the northern hemisphere, cases of this infectious disease peak between November and March, and fatalities are not uncommon. Influenza vaccines can protect against the illness, but they aren’t always effective. According to the Robert Koch Institute, the vaccines for 2018/2019 were only about 20 percent effective. In the iCAIR® project, Fraunhofer researchers are collaborating with partners to develop new, urgently needed agents against influenza, as well as against other infectious diseases that are gaining ground worldwide. What is particularly interesting here is that the research team at the Fraunhofer Institute for Toxicology and Experimental Medicine ITEM can test the anti-infective agents in vital human lung slices.