The West Nile virus has been detected in a blood donor in the province of Utrecht, Netherlands, marking the first case since 2020. The donor, who had mild symptoms, had not recently traveled abroad, according to the National Institute for Public Health and the Environment (RIVM). The infection was identified during scientific research conducted by Sanquin blood bank in August. The virus is typically transmitted through mosquitoes that feed on infected birds and then transmit it to humans and other animals. While most infections are asymptomatic, a small percentage can lead to flu-like or neurological symptoms, particularly in individuals over 50 or with weakened immune systems. Recent positive tests in a horse and bird suggest local mosquito activity carrying the virus, though the RIVM maintains the risk of contracting West Nile fever in the Netherlands remains low. The RIVM advises taking preventative measures against mosquito bites, such as wearing protective clothing and using repellents.