 Two genera of chigger mites, each containing many species, are of concern to deployed military forces.They are Eutrombicula and Leptotrombidium.Chiggers in the genus Eutrombicula, such as Trombicula alfreddugesi, do not transmit any known pathogens to people, but they can cause irritating bites, dermatitis and severe itching when they feed on the unsuspecting host.