 The rat lungworm, angiostrongelous cantonensis, is an emerging parasite that can cause eosinophilic meningitis in humans. It has spread from its native Asia to many tropical and subtropical regions around the world, mainly through ship transportation of its primary host, the rat. Recently, a, cantonensis was discovered in Spain for the first time, in three rats trapped in the sewers of the city of Valencia. Further investigation revealed that eight out of 94 rats tested positive for the parasite. This high rate of infection suggests that the parasite may pose a significant threat to human health if proper precautions are not taken. This article was authored by Maria Teresa Gallin-Pachades, Mercedes Gomez-Samblas, Antonio Osuna, and others.