During acute DENV infection, the detected Ki67 response was several orders of magnitude stronger compared to the recently reported NK cell responses in other flavivirus infections, including YFV (attenuated YFV 17D) and TBE infection7,8, and more in line with the potent responses observed in, for example, acute hantavirus infection6. The gene discussed is MKI67; the disease is Flavivirus Infections.