This thesis is a comparative study of the epidemiological characteristics of health-care associated bacteriuria in short and medium term of geriatrics wards in Strasbourg's University Hospital, between 2003 and 2017, in the follow-up of Eric de Pasquale's thesis in 2010.

This comparative study will allow to see the evolution of urinary bacterial ecology, bacterial sensitivity to antibiotics, and the part of multi-resistant bacteria, during these 14 years in geriatric services in Strasbourg.

Inclusion Criteria:

• patient of age who has been hospitalized in geriatric wards (rehabilitation car service and internal medicine) of Strasbourg's University hospital
• date of hospital leaving after 1/1/17 and before 1/1/18
• patient who has a health-care urinary tract infection (occurred more than 48h after admission)
• single bacteria in the CBEU
• bacteriuria > 105 cfu/mL regardless which clinical context or bacteria
• if a patient has several bacteriuria, they can be included if they appear after a precedent episode well treated or if the bacteria is different from the precedent

Exclusion Criteria:

• participation refusal
• Leaving of hospital out of the inclusion period
• Urinary tract infection which occurred less than 48h after admission (communitarian infection)
• bacteriuria < 105 cfu/mL
• multiple bacteria in the CBEU

• patient of age who has been hospitalized in geriatric wards (rehabilitation car service and internal medicine) of Strasbourg's University hospital
• date of hospital leaving after 1/1/17 and before 1/1/18
• patient who has a health-care urinary tract infection (occurred more than 48h after admission)