<s>[INST] How does infection occur? [/INST] Studies show that the germs that cause urinary tract infections are present in the intestinal flora. Currently, everything seems to indicate that the route of acquisition of these germs is usually related to ingestion. Some people have a more predisposing intestinal "environment", but the features of that environment and how it can be modified have not yet been established.   Source: Hospital Clinic Barcelona. Link: https://www.clinicbarcelona.org/en/assistance/diseases/urinary-tract-infection/frequently-asked-questions. Field: Urology. Disease: Urinary Tract Infection  </s>