Bacteria commonly found in the gastrointestinal (GI) tract.
In terms of specific bacteria, E. coli. (Escherichia coli) is by far the most common organism responsible for bladder infection or cystitis. Staph organisms (from skin) and other gut bacteria (Proteus, Klebsiella, Enterococcus) are other bacteria that can cause cystitis and other forms of urinary infections. The most common UTIs occur mainly in women and affect the bladder and urethra. 1  Infection of the bladder (cystitis). 2  This type of UTI is usually caused by Escherichia coli (E. coli), a type of bacteria commonly found in the gastrointestinal (GI) tract. 3  However, sometimes other bacteria are responsible. Urinary Tract Infections (UTIs). Urinary tract infections (UTIs) are a common type of infection caused by bacteria (most often E. coli) that travel up the urethra to the bladder. A bladder infection is called cystitis. If bacterial infection spreads to the kidneys and ureters, the condition is called pyelonephritis. The urinary tract is comprised of the bladder, kidneys, ureters and urethra. Urinary tract infections are the second most common type of infection in the body and account for around 8.1 million visits to health care providers each year. 1 Infection of the bladder (cystitis). 2  This type of UTI is usually caused by Escherichia coli (E. coli), a type of bacteria commonly found in the gastrointestinal (GI) tract. 3  However, sometimes other bacteria are responsible. 4  Sexual intercourse may lead to cystitis, but you don't have to be sexually active to develop it. Bladder infections are known as cystitis or inflammation of the bladder. They are common in women, but very rare in men. More than half of all women get at least one bladder infection at some time in their lives. Although bacterial infections are the most common cause of cystitis, a number of noninfectious factors also may cause the bladder to become inflamed. Some examples include: 1  Interstitial cystitis. 2  The cause of this chronic bladder inflammation, also called painful bladder syndrome, is unclear. 1 Infection of the urethra (urethritis). 2  This type of UTI can occur when GI bacteria spread from the anus to the urethra. 3  Also, because the female urethra is close to the vagina, sexually transmitted infections, such as herpes, gonorrhea, chlamydia and mycoplasma, can cause urethritis.
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common causes for bladder infections