Fungal Pneumonia - Symptoms, Risk Factors, Prevention, Diagnosis, and Treatment

What Is Fungal Pneumonia or Pneumocystis Pneumonia?

Pneumocystis pneumonia (PCP), or fungal pneumonia, is a severe infection caused by the fungus Pneumocystis jirovecii that causes fluid buildup and inflammation in the lungs. This fungus spreads through the air and is very common. Those people with medical conditions that weaken their immune systems, such as HIV-AIDS, or who take certain medications (such as corticosteroids) that reduce the body’s ability to fight foreign bodies and infections are predisposed to PCP, which makes them very sick. After the availability of antiretroviral therapy (ART) for HIV-AIDS, this incidence has been reduced, but PCP is still a public health concern.

Scientists have changed this organism's classification and name since it first appeared in patients with HIV in the 1980s. Pneumocystis jirovecii was classified first as a protozoan but is now considered a fungus. PCP can also affect other body parts, including the lymph nodes, bone marrow, and liver.

What Are the Symptoms of Fungal Pneumonia?

During the early stages of the infection, symptoms might be absent, or they could be mild. The symptoms develop over a period of several days or weeks and include-

• Fever (usually low in case of HIV, otherwise higher).

• Dry cough.

• Difficulty breathing.

• Chest pain.

• Chills.

• Fatigue (tiredness).

Age can play a role in determining the severity of symptoms in people with fungal pneumonia, including:

• The symptoms tend to be mild in older adults, but the condition can sometimes lead to mental confusion, requiring immediate medical attention.

• Infants and toddlers with fungal pneumonia may have difficulty feeding, breathing problems (grunts or rattles while breathing), pale-colored skin, a limp appearance, less urine production, and fussiness.

What Are the Risk Factors for Fungal Pneumonia?

PCP rarely occurs in healthy people, but the fungus may be present in their lungs for an extended period without presenting any symptoms. Twenty percent of adults might carry this fungus at any given time, and their immune system removes it after several months.

Fungal pneumonia tends to affect people with compromised immunity. The risk factors include-

• People aged 65 or older.

• Toddlers and infants aged two and younger.

• Human immunodeficiency virus (HIV-AIDS) patients.

• Cancer patients undertaking chemotherapy.

• Patients taking corticosteroids.

• Inflammatory disorders or autoimmune disorders (lupus, rheumatoid arthritis, multiple sclerosis, and others).

• Hematologic (blood) disorders.

• Cancer.

• Solid organ or stem cell transplant.

In addition, immunity is also affected by several lung and heart conditions, which act as risk factors for fungal pneumonia. These factors include-

• Cystic Fibrosis - Life-threatening disorder affecting the lungs and the digestive system.

• Asthma - Inflammatory disease of the airways to the lungs.

• Chronic Obstructive Pulmonary Disease - Chronic obstructive pulmonary disease (COPD) is a group of lung diseases that block the airflow and make it difficult to breathe.

• Emphysema - Lung condition causing shortness of breath.

• Unmanaged Diabetes - Uncontrolled high blood sugar.

What Are the Types of Fungal Pneumonia?

1. Pneumocystis Pneumonia: Pneumocystis pneumonia is a fungal infection. The symptoms include dry cough, fever, and chest pains.

2. Valley Fever: Valley fever, or coccidioidomycosis, is caused by Coccidioides fungi. It typically affects individuals aged 60 and above and those who work in construction and farming.

3. Histoplasmosis: It is caused by the Histoplasma fungus and causes pneumonia-associated symptoms. In more serious situations, it may affect the brain and spinal cord.

4. Cryptococcus: It is caused by Cryptococcus neoformans. It occurs in individuals who have compromised immune systems. In severe cases, it affects the brain, causing cryptococcus meningitis.

5. Aspergillosis: It is caused by Aspergillus. It emerges in individuals with weak immune systems. It usually causes symptoms associated with pneumonia. In this condition, a ball-like structure grows in the lungs.

How Can Fungal Pneumonia Be Prevented?

Currently, no vaccine is available to prevent PCP. A healthcare provider might prescribe certain medicines to people who are more likely to develop the disease to prevent PCP. The medications most commonly used to avoid PCP are Trimethoprim and Sulfamethoxazole (TMP/SMX), also known as Co-trimoxazole.

Other medicine options are available for people who cannot take TMP/SMX. Medications to prevent PCP are required for some people affected with HIV or who have undergone stem cell transplants and some solid organ transplants. Healthcare providers might also prescribe certain medications to prevent PCP in people taking long-term, high-dose corticosteroids.

How Is Fungal Pneumonia Diagnosed?

One of the main challenges of fungal pneumonia is its resemblance to other diseases. Most people delay consulting a healthcare provider since they assume they have a cold or flu.

Fungal pneumonia is diagnosed with the following tests-

• Evaluation: Initial evaluation is done by assessing the symptoms and medical history and performing a physical examination, including a healthcare provider using a stethoscope to listen to the lungs.

• Chest X-ray: X-ray imaging assesses the buildup of fluid in your lungs, the inflammation pattern, and the disease's severity.

• Blood Testing: A blood sample can help determine the health of the immune system and the body's reaction to the fungus. A complete blood test (CBC) that measures the amount of red and white blood cells and platelets is often ordered.

• Blood Culture: Clinical tests of blood samples may be performed to ensure that the infection has not spread from the lungs to other body parts. The pathogens present in the bloodstream warrant particular care.

• Pulse Oximetry: This test, or any other test that checks blood-oxygen levels, may be conducted in advanced cases. Deficient levels may be an indication of a medical emergency.

In severe cases, additional testing may be required, including:

• Sputum Test: In this test, a sample of the mucus coughed by the patient, called sputum, is tested clinically to find out the cause of the infection.

• Computed Tomography (CT) Scan: A chest CT scan is ordered when the healthcare provider suspects significant lung damage or other complications.

• Pleural Fluid Culture: In this test, a sample of fluid from the pleura (the tissue covering the lungs) is screened for signs of fungi.

• Bronchoscopy: This involves using an endoscopic device with a camera attached at the end of a retractable tube. It helps healthcare providers have a real-time view of the inside of the air passages and the lungs.

How Is Fungal Pneumonia Treated?

PCP can be fatal if left untreated. Healthcare providers treat PCP with prescription medicine. The most common treatments for PCP are Trimethoprim and Sulfamethoxazole (TMP/SMX), also called Co-trimoxazole. This medicine is administered orally or through a vein (intravenously) for three weeks. Possible side effects of TMP/SMX involve rash and fever. Other treatments are available for patients who cannot take TMP/SMX.

When to Consult a Medical Professional?

Individuals must seek medical attention if they have symptoms of pneumonia, which include -

• Breathlessness never goes away.

• Persistent fever and thick mucus.

• Severe exhaustion.

Is There an Emergency With Fungal Pneumonia?

A medical emergency may arise from pneumonia. Visit the nearby hospital if one experiences the following:

• Breathing difficulties and dyspnea while at rest.

• Discomfort and pain in the chest.

• Distorted thought processes.

Conclusion:

Fungal pneumonia represents a persistent medical challenge. It is particularly problematic because it affects people who are already sick with lowered immunity, adding further to their burden. In addition, this condition's symptoms are often left unnoticed and untreated, which worsens the outcome. Do not hesitate to seek medical attention because fungal pneumonia can be life-threatening.