Abstract
A prospective study of the bacterial populations of non-infected urine was mounted in an attempt to define the length of delay between voiding and analysis during which culture would not give false positive results due to the multiplication of contaminant bacteria present at the time of voiding. The findings suggest that culture of urine within four hours of voiding is likely to give a true indication of the presence or absence of infection. With further delay the interpretation of a heavy growth of bacteria in urine becomes progressively more unreliable, even if that growth is in pure culture.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC476497/
Types of Bacteria Found in Urine (By Clemie Nye, eHow Contributor)
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Urine is normally a sterile body fluid but, while leaving the body, it can become infected by bacteria. A common way for urine to contract bacteria is when it is kept in an infected bladder, which provides a fertile environment for bacteria to grow. Bacteria is the main cause of urinary tract infections. When a large concentration of bacteria is in the urine, it also could result in Asymptomatic bacteriuria, a harmless condition that often requires no treatment.
http://www.ehow.com/list_6384198_types-bacteria-found-urine.html
Changes in urine composition after trauma facilitate bacterial growth
Abstract
Background
Critically ill patients including trauma patients are at high risk of urinary tract infection (UTI). The composition of urine in trauma patients may be modified due to inflammation, systemic stress, rhabdomyolysis, life support treatment and/or urinary catheter insertion.
Methods
Prospective, single-centre, observational study conducted in patients with severe trauma and without a history of UTIs or recent antibiotic treatment. The 24-hour