Diane Keaton's death on Saturday has sparked reminders of the risks of pneumonia.
The iconic actress, director and producer was 79 when she succumbed to therespiratory infectionin California.
Keaton's family confirmed her cause of deathto People magazineon Wednesday. Fox News Digital has reached out to her rep for comment.
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Pneumonia is defined by Cleveland Clinic as an infection in the lungs caused by bacteria, viruses or fungi.
This can cause the lung tissue to swell and create a buildup of fluid or pus in the lungs.
Dr. Marc Siegel, clinical professor of medicine at NYU Langone Health and Fox News' senior medical analyst, previously said the risk of pneumonia depends on the underlying health conditionsof the patient and the strength of the person's immune system.
Most cases of community-acquired pneumonia arebacterial or viral.
Bacterial pneumonia is normally more severe than viral pneumonia, according to Cleveland Clinic.
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It can be caused by an infection of Streptococcus pneumoniae bacteria, also called pneumococcal disease.
Other bacteria that can cause the respiratory condition include mycoplasma pneumoniae, Haemophilus influenza, Chlamydia pneumoniae and Legionella (Legionnaires’ disease), per the above source.
"Pneumococcus is a major cause of pneumonia — it can be deadly," Siegel said. "Invasive pneumococcal disease can have a death rate of up to 20% in adults."
The risk of bacterial pneumonia increases with age and with chronic illness, the doctor added.
Viral pneumonia can sometimes stem from viruses that include the flu, common cold, COVID-19and respiratory syncytial virus (RSV), according to Cleveland Clinic.
This type of pneumonia typically improves on its own.
In less common cases, some fungi (molds) or protozoa can cause pneumonia.
"The biggest concern is that it could spread into the bloodstream and cause sepsis, which is definitely life-threatening," Siegel cautioned.
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Atypical pneumonias are caused by mycoplasma, legionella and kinds of chlamydia (not STD) and pertussis, the doctor added.
Early diagnosis and treatment is key to recovery, especially in patients at risk, Siegel said.
High-risk groups include the very young, very old, immunocompromised people, those with chronic obstructive pulmonary disease (COPD) andpeople who smoke.
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For those over age 50, the Centers for Disease Control and Prevention recommends thepneumococcal vaccine.
"The effective version, known as Prevnar, can work against 20 different strains," Siegel added.
