The entry of bacteria into the urinary tract and the  establishment of urinary tract infection.
D000293:Adolescent; D000328:Adult; D000917:Antibody Formation; D001419:Bacteria; D001437:Bacteriuria; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D014521:Urethra / Q000382:microbiology / Q000502:physiology; D001743:Urinary Bladder / Q000382:microbiology / Q000502:physiology; D014552:Urinary Tract Infections / Q000209:etiology* / Q000276:immunology / Q000382:microbiology; D014554:Urination / Q000502:physiology