<prompt> Which of the following flavivirus is closely related to Russian spring summer encephalitis causing virus -DengueChickengunyaKFDWest Nile fever  <response>: A new arbovirus antigenically related to the RSS complex was isolated by investigators from the national institute of virology Pune from the patients and dead monkeys. It was named the KFD virus. REF:ANANTHANARAYAN AND PANIKERS TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO:524 