Editing Infective endocarditis (section)

=== Heart side ===
Endocarditis can also be classified by the side of the heart affected:
* People who [[intravenous]]ly inject [[opioid]]s such as [[heroin]] or [[methamphetamine]] may introduce infection which can travel to the right side of the heart, classically affecting the [[tricuspid valve]], and most often caused by ''S. aureus''.<ref name=Robbins/>
* Regardless of cause, left-sided endocarditis is the most common, while right-sided endocarditis accounts for 5-10% of cases and is more common in people who inject [[drug injection|IV drug]]s and in patients with congenital heart disease.<ref name=Robbins/><ref name="auto"/>