Pneumonia, an infection of the lung tissue caused by bacteria or viruses that can lead to various symptoms of coughing, fever and difficulty of breathing¹. But what about Community acquired pneumonia? Not many people are aware of this type of disease, and awareness should be increased regarding it. Simply put, Community acquired pneumonia (CAP) is a lung infection that you pick up outside of a hospital setting². This could happen at work, school, the supermarket or even our own homes. It is actually one of the most common types of pneumonia people get, but not many people know what it is².
You might be asking, why is CAP such a big deal? It is actually one of the leading infectious causes of death worldwide, responsible for millions of deaths each year². While it can affect anyone, the people most at risk are the younger children, older individuals, as well as those with chronic conditions, and anyone with a weakened immune system³. In fact, in the United States alone, CAP results in around 1.4 million emergency department visits and 740,000 hospitalizations every year³. Symptoms? Common signs include a persistent cough, fever, shortness of breath, and chest pain that worsens with breathing⁴.
The tricky part about CAP is that it is not caused by just one germ. A range of bugs can trigger it, including bacteria, viruses, microbes and even fungi in rare cases⁵. But here is the challenge, doctors can only pinpoint the exact germ in about 38% of hospitalised patients³. Viruses like influenza and SARS-CoV-2 are responsible for a significant portion of these cases, making it increasingly common to find both virus and bacteria together in a polymicrobial infection⁶.
Now that we have addressed the causes and symptoms, it is good to know that diagnosing CAP usually starts with a physical exam and a chest X-ray to confirm the infection⁷. Which is why it is really important to get regular screening. In some cases, lung ultrasound may also be used⁷. If you are worrying, the treatment depends on the severity and what is causing it. Since the exact pathogen often is not known at the outset, doctors start with antibiotics just to see if there are any bacteria present⁸. However, for patients with a confirmed viral infection who are otherwise healthy, antibiotics may not be necessary⁸. For those who need antibiotics, a shorter period of time, around three days is recommended for patients who are responding well⁹. From everything mentioned, the most effective way to protect yourself is prevention. It is not some miracle medicine that will help solve everything, it is your responsibility against your own health.
References:
¹ World Health Organization. Pneumonia fact sheet. 2025.
² The Lancet. Community-acquired pneumonia. 2025.
³ Vaughn VM, Dickson RP, Horowitz JK, Flanders SA. Community-Acquired Pneumonia: A Review. JAMA. 2024;332(15):1282.
4 American Thoracic Society. Diagnosis and Management of Community-Acquired Pneumonia Guideline. 2025.
5 BMJ Best Practice. Community-acquired pneumonia aetiology. 2026.
6 Medscape. Community-Acquired Pneumonia (CAP). 2025.
7 Mayo Clinic News Network. What do you know about pneumonia? 2016.
8 European Respiratory Journal. CAP treatment guidelines update. 2025.
9 Clinical Infectious Diseases. Short-course antibiotics for CAP. 2024.