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.
Pelvic Inflammatory Disease Causes: Pelvic inflammatory disease (PID) is a serious bacterial infection of the female reproductive organs. Men cannot develop PID, and it is not contagious (however, men can carry the bacteria that was the initial cause of PID). Many different types of bacteria can cause PID. PID usually starts in the vagina via an existing sexually transmitted infection. Gonorrhea and Chlamydia are the most common causes of PID. You can get PID without having an STI.