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.
In the majority of cases pelvic inflammatory disease is caused by an infection in the vagina or cervix which spreads. PID can refer to bacteria, fungal or parasitic infections-in most cases the infection is bacterial. bacterium called Chlamydia is a common cause, followed by gonorrhea. Pelvic inflammatory disease can lead to complications, including chronic persistent pelvic pain, ectopic pregnancy and infertility.