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.
PID is infection and swelling inside a womenâs reproductive organs, sometimes caused by an STD. Untreated chlamydia or gonorrhea causes PID, so if you think you may have an STD, or be at risk, see your health care provider right away. Women who have had chlamydia more than once are more likely to get PID. Many times women are reinfected with chlamydia because their partner doesnât get treated. Younger women are more at risk for PID. You are at risk for PID if youâve had a lot of sex partners or your partner has many other sex partners.