A chemical formula that indicates the simplest numerical ratio of the elements within a molecule, without demonstrating the molecule's chemical bonds or structure. For example, the empirical formula for water is H2O. Synonym: molecular formula.
Pelvic inflammatory disease (PID) is an infection caused by bacteria. When bacteria from the vagina or cervix travel to your womb, fallopian tubes, or ovaries they can cause an infection. Most of the time, PID is caused by bacteria from chlamydia and gonorrhea. These are sexually transmitted infections (STIs). Having unprotected sex with someone who has an STI can cause PID.
Most episodes of urethritis are caused by infection by bacteria that enter the urethra from the skin around the urethra's opening. Bacteria that commonly cause urethritis include: 1  E. coli and other bacteria present in stool. 2  Gonococcus, which is sexually transmitted and causes gonorrhea.3  Chlamydia trachomatis, which is sexually transmitted and causes chlamydia.acteria that commonly cause urethritis include: 1  E. coli and other bacteria present in stool. 2  Gonococcus, which is sexually transmitted and causes gonorrhea. 3  Chlamydia trachomatis, which is sexually transmitted and causes chlamydia.