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Understanding The Different Types Of Pneumonia

Deciphering Pneumonia: Causes, Categories, and Key Differences

Pneumonia is an inflammatory condition of the lung primarily affecting the tiny air sacs known as alveoli. Typically, the alveoli fill with fluid or pus, leading to symptoms like cough with phlegm or pus, fever, chills, and difficulty breathing. Pneumonia can result from various causes, including infectious agents and other non-infectious triggers. Here, we’ll delve into the main types of pneumonia, their causes, and characteristics.

Pneumonia is not a single disease but rather a reaction of the lungs to various pathogens or irritants. It’s essential to comprehend the differences between its types, as causes, prevention, and treatment can differ significantly. Here, we provide a comprehensive understanding and address frequently asked questions regarding this condition.

If you’re in the Tampa, Florida, area and believe that you may be experiencing mild pneumonia symptoms, TGH Urgent Care powered by Fast Track can provide the timely treatment you need. Our state-of-the-art medical clinics offer treatment for many different non-life-threatening illnesses and injuries, and our board-certified medical providers are passionate about healthcare.

Types of Pneumonia

Community-Acquired Pneumonia (CAP)

  • Definition: This is the most common type of pneumonia. It occurs outside of hospitals or other healthcare facilities.
  • Common Causes:
    • Bacteria: The most common being Streptococcus pneumoniae1.
    • Viruses: Such as influenza, respiratory syncytial virus (RSV), and, more recently, SARS-CoV-2, which causes COVID-192.
    • Fungi: Especially in individuals with weakened immune systems or those living in certain geographic areas.

Hospital-Acquired Pneumonia (HAP)

  • Definition: Pneumonia that someone gets during a stay at a hospital, especially if they are on a ventilator.
  • Common Causes: Bacteria, most commonly methicillin-resistant Staphylococcus aureus (MRSA) and Pseudomonas aeruginosa3.

Ventilator-Associated Pneumonia (VAP)

  • Definition: A subset of HAP occurs when individuals on mechanical ventilation get pneumonia.
  • Common Causes:: Similar to HAP, bacteria like MRSA and Pseudomonas aeruginosa are culprits4.

Aspiration Pneumonia

  • Definition: Occurs when you inhale food, drink, vomit, or saliva into your lungs.
  • Common Causes: Anaerobic bacteria, which can grow in the absence of oxygen, often cause this form of pneumonia5.

Opportunistic Pneumonia

  • Definition: Occurs in people with weakened immune systems.
  • Common Causes: Organisms that wouldn’t typically cause pneumonia in healthy individuals, such as Pneumocystis jirovecii, which can lead to Pneumocystis pneumonia (PCP) in people with HIV/AIDS6.

Fungal Pneumonia

  • Definition: Caused by fungi, often from soil or bird droppings.
  • Common Causes: Histoplasmosis, coccidioidomycosis, and blastomycosis are examples of fungi that can cause pneumonia, especially in immunocompromised individuals7.

Bacterial Pneumonia

  • Causative Agent: Various bacteria can be the culprits, with Streptococcus pneumoniae being the most prominent one.
  • Conditions Favoring Infection: This form often strikes when an individual’s health defense mechanisms are compromised due to factors like poor nutrition, pre-existing illnesses, advanced age, or weakened immunity. Essentially, the bacteria take advantage of the body’s weakened state to infiltrate the lungs.

Viral Pneumonia

  • Causative Agent: Several viruses, with the influenza virus being a notable contributor. This form accounts for approximately a third of all pneumonia instances.
  • Bacterial Co-infection: Interestingly, contracting viral pneumonia enhances the risk of subsequently developing bacterial pneumonia. The prior viral infection may pave the way for bacterial agents to thrive in the already inflamed lung environment.

Mycoplasma Pneumonia (Atypical Pneumonia)

  • Causative Agent: Induced by the bacterium Mycoplasma pneumoniae.
    • Characteristics: This variant, often termed “atypical” due to its distinct symptoms and signs, generally leads to a milder yet widespread form of pneumonia.

Symptoms, Diagnosis, and Treatment

While each type can have unique presentations, common symptoms of pneumonia include:

Diagnosis typically involves:

  • Clinical examination
  • Chest X-ray
  • Blood tests
  • Sputum tests

Treatment depends on the cause:

  • Bacterial pneumonia is treated with antibiotics.
  • Viral pneumonia may be treated with antiviral medications.
  • Fungal pneumonia is treated with antifungal medications.


  • Vaccination against some of the common organisms causing pneumonia (e.g., Streptococcus pneumoniae and influenza) can help reduce risk.
  • Hand hygiene and infection control practices can prevent the spread in healthcare settings.

Who is at risk for pneumonia?

While pneumonia can affect anyone, these groups are particularly vulnerable:

  • Adults ages 65 and older
  • Children younger than age 2
  • People with certain medical conditions
  • People that smoke

Factors Determining the Type of Pneumonia

The type of pneumonia someone has is typically determined by:

  1. The organism causing the infection:

Bacteria, viruses, fungi, and other microorganisms can all be culprits.

  1. Where the infection was acquired:

For instance, community versus hospital.

  1. The patient’s overall health:

Patients with compromised immune systems may contract forms of pneumonia that a healthy person would not.


Pneumonia can lead to complications if not treated promptly. These include:

  • Respiratory failure
  • Sepsis
  • Acute Respiratory Distress Syndrome (ARDS)
  • Lung abscesses

How is Pneumonia Identified?

Determining if someone has pneumonia often begins with an evaluation of recent health events, such as surgeries, respiratory infections, or exposure during travels. With these considerations in mind, healthcare professionals can often suspect pneumonia through a detailed history and physical examination. To solidify the diagnosis, the following tests might be undertaken:

  • Chest X-ray: This offers images of the internal structures, including the lungs.
  • Blood Tests: These can indicate if an infection is ongoing and if it has reached the bloodstream. Arterial blood gas testing measures the oxygen level in the blood.
  • Sputum Culture: A test on the mucus coughed up from the lungs, helping to identify any present infections.
  • Pulse Oximetry: Using an oximeter, this non-invasive test measures blood oxygen levels. The device, often clipped to a finger, emits a harmless red light.
  • Chest CT Scan: A more intricate imaging technique, providing detailed cross-sectional visuals of the body, surpassing the clarity of standard X-rays.
  • Bronchoscopy: This procedure examines the primary airways in the lungs with a flexible instrument called a bronchoscope. It can assess lung conditions, detect obstructions, and collect tissue or fluid samples.
  • Pleural Fluid Culture: By extracting fluid from the space between the lungs and the chest wall using a needle, this test identifies the bacteria causing the pneumonia.

Pneumonia Treatment Approach:

The nature of the pneumonia dictates its treatment. While many cases can be managed at home, severe instances may necessitate hospitalization. Bacterial pneumonia typically calls for antibiotics, which might also expedite recovery from mycoplasma pneumonia and certain other forms. Most viral pneumonia, however, resolves without specific interventions.

Additional care recommendations include maintaining a nutritious diet, hydrating sufficiently, resting, and possibly resorting to oxygen therapy, pain alleviation, fever reducers, and cough suppressants, particularly if the cough is pronounced.

Is it Possible to Prevent Pneumonia?

Consult your healthcare professional at one of your closest TGH Urgent Care walk-in clinics regarding vaccinations. As the flu often leads to pneumonia, an annual flu vaccination can serve as a shield against both ailments.

Additionally, there’s a vaccine against pneumococcal bacteria, which safeguards against a prevalent bacterial pneumonia type. It’s advised for children under the age of 5 and adults aged 65 and above.

Furthermore, individuals of all ages with certain health conditions that elevate their risk for pneumococcal infections should also consider this vaccination.

Frequently Asked Questions (FAQs)

Providing a Complete Healthcare Experience at TGH Urgent Care for Pneumonia

Pneumonia is a serious condition with various types and causes. It’s crucial to understand its types, be aware of its symptoms, and seek timely medical care. Vaccination and good hygiene practices are effective preventive measures.

In addition to providing expert pneumonia treatment, we see patients ages 3 months and older for minor fractures, ear infections, colds, flu, and more. We also offer physical examinations and occupational health services, and our in-house lab testing and X-ray capabilities allow us to provide our patients with comprehensive care so they don’t have to waste time visiting lab or imaging facilities. We even have an in-house pharmacy where we can fill most of the prescriptions that we write for our patients.

Our doors are open from 8 a.m. to 8 p.m., seven days a week, so it’s easy for you to make time in your daily schedule for pneumonia treatment. You can visit any of our Tampa, FL, area locations to be seen on a first-come, first-served basis. Or, if you’d like to reduce your wait time once you arrive, you can sign in ahead of your visit using our On My Way system.


  1. CDC – Pneumococcal Disease
  2. CDC – Viral Pneumonia
  3. Torres A, Niederman MS, Chastre J, et al. International ERS/ESICM/ESCMID/ALAT guidelines for the management of hospital-acquired pneumonia and ventilator-associated pneumonia. Eur Respir J. 2017;50(3):1700582.
  4. CDC – Ventilator-associated Pneumonia (VAP)
  5. DiBardino DM, Wunderink RG. Aspiration pneumonia: a review of modern trends. J Crit Care. 2015;30(1):40-48.
  6. CDC – Pneumocystis Pneumonia
  7. CDC – Fungal Lung Infections
  8. CDC – Mycoplasma Pneumonia

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