<prompt> Most common route of infection in kidney tuberculosisAscending infectionLymphatic spreadDirect invasionHematogenous spread  <response>: Genitourinary tuberculosis GUTB accounts for 14 of non-pulmonary cases of TB. It is caused by dissemination of the organism through the bloodstream and is thus always secondary TB. ref : Bailey and Love 27th ed , chapter 76 , pg no 1405 