. . . "of pneumonia and a weak immune system (for example such as with HIV or chemotherapy)Worsening of symptoms after initial improvementPreventionYou can help prevent pneumonia by following the measures below.Wash your hands often, especially:Before preparing and eating foodAfter blowing your noseAfter going to the bathroomAfter changing a baby's diaperAfter coming in contact with people who are sickDo" .