Ku-fever (Latin Q-febris, ricketsiosis Q-rickettsiosis, kokieellosis, pneumomicticosis, fever of slaughterhouses, pulmonary typhus Derrick-Bernet, Balkan flu, Central Asian fever) - Acute natural focal zoonotic rickettsiosis with various mechanisms of transmission of the pathogen, characterized by the development of a common reticuloendotheliosis.