Candida parapsilosis is a type of fungal infection that has become increasingly common over the past two decades. It is now one of the leading causes of serious fungal illness, known as invasive candidiasis. While most healthy people carry this fungus on their skin without any problems, it can become dangerous for those with weakened immune systems. This article explains what Candida parapsilosis is, who is most at risk, and what treatment looks like in a Canadian healthcare setting.
What Is Candida parapsilosis?
Candida parapsilosis belongs to the Candida family of fungi. These fungi are naturally found on human skin and in the body. In most people, the immune system and healthy bacteria keep the fungus under control.
However, when the body’s defences are weakened, Candida parapsilosis can cause serious infections. It most often affects the blood and internal tissues. It is especially linked to infections in hospitalised patients and premature newborns.
Compared to the better-known Candida albicans, Candida parapsilosis is more likely to affect people who have already received antifungal treatment. It is also known for its ability to survive on medical devices, which makes it a significant concern in hospital settings across Canada.
According to Health Canada, fungal infections are an important area of infectious disease monitoring, particularly in vulnerable populations such as those in intensive care units.
Who Is Most at Risk of Candida parapsilosis Infection?
Not everyone faces the same level of risk. Certain groups are far more likely to develop a serious infection with Candida parapsilosis. Understanding your risk can help you and your family doctor take the right precautions.
High-Risk Groups
The people most at risk include premature newborns and patients in intensive care units (ICUs). In fact, Candida parapsilosis accounts for more than one quarter of fungal infections in premature infants. These patients often have underdeveloped or compromised immune systems.
People living with HIV/AIDS are also at higher risk. So are patients who have had surgery, especially on the gastrointestinal system. A weakened immune system creates an opening for this fungus to spread.
Medical Devices and Hospital Settings
One of the most important risk factors is the use of medical devices inside the body. Candida parapsilosis is well known for forming biofilms — thin, sticky layers of fungal colonies — on plastic surfaces. These biofilms cling to catheters, feeding tubes, and other implanted devices.
Once a biofilm forms, the infection becomes much harder to treat. This is why hospital-acquired (nosocomial) infections involving Candida parapsilosis are a serious concern in Canadian hospitals.
Main Risk Factors at a Glance
Use of a central venous catheter
Recent surgery, especially gastrointestinal
Cancer or malignant tumours
Treatment with immunosuppressive drugs
Parenteral nutrition (nutrition delivered through a vein)
Prolonged antibiotic use
Organ transplantation
Weakened immune system due to illness
Symptoms of Candida parapsilosis
The symptoms of a Candida parapsilosis infection depend on where in the body the infection occurs and how severe it is. Mild infections look very different from severe, life-threatening ones.
Mild Symptoms
In milder cases, this infection may appear as a red, itchy, and painful irritation. Common mild sites include the eyes, mouth, or vagina. These types of infections are more manageable and respond well to treatment when caught early.
Severe Symptoms
In more serious cases, Candida parapsilosis can enter the bloodstream. This leads to symptoms such as high fever and chills. In severe infections, it can cause septic shock — a dangerous drop in blood pressure that becomes life-threatening.
Furthermore, serious infections can lead to kidney failure and respiratory failure. In rare cases, Candida parapsilosis can cause septic arthritis (joint infection) or pneumonia. When the infection spreads to the lining of the abdomen (the peritoneum), it requires urgent medical care.
Historically, Candida parapsilosis was first identified in hospitals as a cause of endocarditis — an infection of the inner lining of the heart — in people who used intravenous drugs. As a result, it has been closely studied in hospital medicine for decades.
For a broader overview of fungal infections and their symptoms, the Mayo Clinic’s guide to fungal infections offers helpful information.
How Does Candida parapsilosis Spread?
Most people already carry Candida parapsilosis on their skin without knowing it. The fungus becomes a problem only when something disrupts the body’s natural balance. This includes a weakened immune system, a break in the skin, or a contaminated medical device.
In Everyday Life
Minor infections of the mouth or mucous membranes can happen when the body’s natural defences are not working properly. Healthy bacteria and a strong immune system normally keep the fungus in check. When those defences are lowered — for example, after a course of antibiotics — the fungus can grow out of control.
In Hospital Settings
In hospitals, Candida parapsilosis spreads mainly through contaminated medical equipment. A healthcare worker or patient can accidentally introduce the fungus onto a wound or surgical device. Because this fungus thrives on plastic surfaces and grows well in sugar-based solutions (like those used in IV nutrition), it spreads easily through feeding tubes and catheters.
Once it enters a weakened patient’s bloodstream, it can cause a severe and rapidly worsening infection. If it forms a biofilm on a device, that device often needs to be removed entirely to clear the infection.
Three Strains of Candida parapsilosis
Scientists have identified three main strains of this fungus. They are classified as Group I, Group II, and Group III. Group I is the most commonly found in clinical settings. Researchers recommend that Group II be renamed Candida orthopsilosis and Group III be renamed Candida metapsilosis, as genetic evidence suggests they are actually separate species.
How Is Candida parapsilosis Diagnosed?
Diagnosing Candida parapsilosis can be challenging because its symptoms look similar to those caused by other Candida species. The main symptoms — fever and chills — are not specific to this fungus alone.
Doctors may also suspect a Candida infection when a patient does not improve after antibiotic treatment. This is because Candida is a fungus, not a bacterium, so antibiotics will not work against it.
Diagnostic Tests
To confirm the diagnosis, a doctor will take a blood sample or a tissue sample. This sample is sent to a laboratory. If a fungal culture grows from the sample, the specific species of Candida can be identified. Some newer diagnostic methods do not require a culture and can provide faster results.
In Canada, these tests are typically ordered by a hospital specialist or infectious disease physician. Your family doctor can arrange a referral if a fungal infection is suspected.
Treatment Options for Candida parapsilosis
Treatment for Candida parapsilosis depends on how severe the infection is. Mild infections are treated differently from serious, bloodstream infections. In all cases, it is important to follow your doctor’s guidance closely.
Antifungal Medications
The first-line treatment for serious Candida parapsilosis infection is usually amphotericin B, given through an IV (intravenously) for two to five days. After that, oral antifungal medication is continued for two to four weeks to fully clear the infection.
Amphotericin B can cause side effects, especially when given by IV. These include nausea, vomiting, joint pain, and weight loss. Your medical team will monitor you closely during this treatment.
Other antifungal medications called azoles may also be used. These include fluconazole and voriconazole. However, Candida parapsilosis can sometimes be resistant to these drugs, particularly in patients who have taken antifungals before. Your doctor will choose the best option based on lab results.
IV Fluids
Patients with serious bloodstream infections often receive intravenous (IV) fluids. This helps manage the drop in blood pressure that can occur with severe Candida parapsilosis infections. Fluids are delivered through a needle or peripheral cannula.
Oxygen Therapy
If the infection affects breathing, oxygen therapy may be needed. This involves wearing a mask or nasal tubes that deliver a higher concentration of oxygen than is found in normal air.
Fever Management
Fever-reducing medications (antipyretics) are also used as part of treatment to keep the patient comfortable and stable while the antifungal medication takes effect.
For more detailed information on antifungal treatments, Healthline’s overview of fungal infections and their treatments is a reliable resource.
When to See a Doctor
If you or a loved one has a weakened immune system and develops a fever, chills, or signs of infection, do not wait. See your family doctor as soon as possible. If your regular doctor is not available, a walk-in clinic can assess you and refer you to a specialist if needed.
Seek emergency care immediately if you experience a sudden high fever, confusion, difficulty breathing, or a rapid drop in blood pressure. These can be signs of septic shock, which is a medical emergency.
If you are already in hospital and notice signs of a new infection — such as redness or swelling around a catheter site — tell your nurse or doctor right away. Early treatment is key to a good outcome.
As always, speak with your healthcare provider before making any decisions about your health. Your provincial health plan covers hospital-based treatment for serious infections, and your family doctor is your first point of contact for any concerns.
Frequently Asked Questions About Candida parapsilosis
What is Candida parapsilosis and is it dangerous?
Candida parapsilosis is a type of yeast fungus that lives naturally on human skin. In healthy people, it causes no harm. However, in people with weakened immune systems or those in hospital, it can cause serious and life-threatening bloodstream infections.
How do you get a Candida parapsilosis infection?
Most people already carry Candida parapsilosis on their skin. Infections happen when the immune system is weakened or when the fungus enters the body through a medical device like a catheter. In hospitals, it can spread through contaminated equipment or on the hands of healthcare workers.
What are the symptoms of Candida parapsilosis?
Mild Candida parapsilosis infections cause redness, itching, and discomfort in areas like the mouth or vagina. Severe infections cause fever, chills, and in the worst cases, septic shock, organ failure, and difficulty breathing. Seek medical attention if you have a fever and suspect an infection.
How is Candida parapsilosis treated?
Candida parapsilosis is treated with antifungal medications. Severe infections are typically treated with amphotericin B given by IV, followed by oral antifungal drugs like fluconazole. Treatment can last several weeks, and your doctor will monitor your progress carefully.
Who is most at risk of Candida parapsilosis infection in Canada?
Premature newborns, ICU patients, people with HIV/AIDS, and those who have had organ transplants are most at risk. Canadians who need long-term use of a central venous catheter or those on immunosuppressive medications are also at higher risk of developing Candida parapsilosis infection.
Can Candida parapsilosis be resistant to antifungal drugs?
Yes, Candida parapsilosis can develop resistance to certain antifungal medications, particularly azoles like fluconazole. This is more common in patients who have previously received antifungal treatment. Your doctor will use lab results to choose the most effective medication for your specific infection.
Key Takeaways
Candida parapsilosis is a fungus that lives naturally on skin but can cause serious infections in vulnerable people.
It is one of the leading causes of invasive fungal infection, especially in hospitals.
Premature newborns, ICU patients, and people with weakened immune systems are most at risk.
It forms biofilms on catheters and medical devices, making it hard to treat once established.
Symptoms range from mild itching and redness to life-threatening septic shock.
Treatment involves antifungal medications such as amphotericin B, fluconazole, or voriconazole.
If you are concerned about a fungal infection, speak with your family doctor or visit a walk-in clinic. Your provincial health plan covers testing and hospital treatment for serious infections.
Always consult a qualified healthcare provider before starting or changing any treatment.
