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Candida species are an important topic because Candida is not a single fungus but an entire genus with several different species. Some live naturally on the skin, in the mouth, in the gut, and in the genital area without causing problems. Others can become more troublesome with overgrowth, a weakened immune system, antibiotic treatment, or an imbalance in the body’s microbiome.
The best-known species is Candida albicans, but there are several other species that can be clinically relevant, such as Candida glabrata, Candida parapsilosis, Candida tropicalis, Candida krusei, Candida auris and Candida lusitaniae.
In this guide, we go through the most important Candida species, how they differ, which other fungi can affect humans, and when symptoms should be taken seriously.
What is Candida?
Candida is a type of yeast. Many Candida species can be found naturally in the body, especially in the gastrointestinal tract, the oral cavity, the genital area, and on the skin. In normal amounts, Candida does not have to be harmful. Problems can arise when the fungus is able to grow too much or invade tissues where it does not belong.
A Candida infection can be superficial, for example a genital yeast infection, oral thrush, or skin fungus. It can also be invasive, which means the fungus spreads to the blood or internal organs. Invasive candidiasis is less common but significantly more serious and is mainly seen in people who are severely ill, immunosuppressed, or have medical lines such as catheters.
Common factors that can contribute to Candida overgrowth
- Antibiotic treatment that affects the bacterial flora
- Weakened immune system
- Diabetes or high blood sugar
- Pregnancy or hormonal changes
- Moist skin folds and an impaired skin barrier
- Catheters, implants, or prolonged hospitalization
- Corticosteroids or other immunosuppressive therapy
- Poor diet over time
The most important species of Candida
Different Candida species have different characteristics. Some mainly cause localized infections, while others are more associated with hospital care, drug resistance, or invasive infections.
Candida albicans – the most common pathogenic species
Candida albicans is the best-known and most common Candida species in human infections. It occurs naturally in the gut, mouth, genital area, and on the skin, but can cause problems when the balance of the microbiome is disrupted.
This species is particularly adaptable. It can switch between yeast form and hyphal form, which makes it easier to adhere to tissues and form biofilm. Biofilm is a protective structure in which microorganisms can become harder for the immune system and treatments to reach.
Common associations:
- Genital yeast infections
- Oral thrush
- Skin infections in moist skin folds
- Gastrointestinal complaints with suspected overgrowth
- Invasive candidiasis in at-risk patients
Candida glabrata – more challenging to treat
Candida glabrata is an important Candida species because it is often less susceptible to certain common antifungal agents than Candida albicans. It occurs particularly in older adults, people with weakened immune systems, and patients with recurrent or complicated infections.
It is often linked to urinary tract infections, genital symptoms, and invasive infections. Because drug susceptibility can vary, species identification is important in more severe or recurrent infections.
Candida parapsilosis – common on skin and in catheter-related infections
Candida parapsilosis is often found on skin and nails. It is particularly relevant in healthcare settings because it can spread via hands, surfaces, and medical equipment.
The species is associated with infections linked to catheters, implants, and other medical access devices. It can also form biofilm on foreign material, which makes it important to recognize in healthcare-associated infections.
Candida tropicalis – often more invasive in vulnerable groups
Candida tropicalis is a Candida species that can be more invasive, especially in people with weakened immune systems, blood disorders, or cancer treatment. It can occur in the gut and is sometimes linked to gastrointestinal symptoms, but is primarily clinically important when it causes bloodstream infection or spread within the body.
If invasive infection is suspected, medical evaluation, laboratory diagnostics, and targeted treatment are always required.
Candida krusei – naturally resistant to certain antifungal agents
Candida krusei is less common than Candida albicans, but important because it is naturally resistant to certain antifungal agents, especially fluconazole. This makes correct species identification crucial in more serious infections.
The species is seen mainly in people with severely weakened immune systems, such as patients with cancer, blood disorders, or prolonged hospitalization.
Candida auris – multidrug-resistant fungus of global significance
Candida auris is a relatively new and highly publicized Candida species. It differs from many other Candida species because it can spread more easily in healthcare settings, survive on surfaces, and be resistant to several classes of antifungal agents.
It is particularly problematic in hospitals and care facilities where it can cause outbreaks. Healthy individuals usually have a low risk of becoming seriously ill, but in patients with weakened immune systems, catheters, intensive care, or severe underlying disease, the infection can be serious.
Candida auris can also be difficult to identify with older laboratory methods, making modern diagnostics and infection control procedures important.
Candida lusitaniae – less common but important in the context of resistance
Candida lusitaniae is a less common Candida species, but it is clinically relevant because it can cause opportunistic infections in people with weakened immune systems, for example in hematologic diseases, neutropenia, or after transplantation.
The species is particularly known for being able to develop resistance during ongoing treatment, especially to amphotericin B. It can cause candidemia, i.e., Candida in the blood, and other systemic infections. Because drug susceptibility can vary, species identification and susceptibility testing are important in serious infections.
Other fungi that can affect humans
Candida is only part of the broader group of fungi that can affect human health. Some fungi live naturally on the body, while others come from the environment, soil, plants, animals, or damp buildings.
Dermatophytes – fungi of the skin, hair, and nails
Dermatophytes are fungi that attack keratin, a protein found in the skin, hair, and nails. They are common causes of athlete’s foot, nail fungus, and ringworm.
Examples of dermatophytes:
- Trichophyton rubrum – common in athlete’s foot and nail fungus
- Trichophyton mentagrophytes – can cause athlete’s foot and skin infections
- Microsporum canis – can spread from animals to humans
- Epidermophyton floccosum – can cause skin and groin infections
Malassezia – yeast on the skin
Malassezia is a yeast that normally occurs on the skin. In some, it can contribute to dandruff, seborrheic dermatitis, or pityriasis versicolor, a superficial skin condition that can cause lighter or darker patches.
Aspergillus – environmental mold
Aspergillus is a genus of molds found in the environment, for example in soil, dust, and organic matter. Most people inhale spores without becoming ill, but people with lung disease or weakened immune systems can develop allergic reactions or invasive aspergillosis.
Cryptococcus – can cause severe infections in immunosuppressed individuals
Cryptococcus is a yeast that can cause severe infection, especially in people with severely weakened immune systems. The best-known species is Cryptococcus neoformans, which can cause meningitis, among other things.
Candida in the gut, mouth, and genital area
Candida can be present in several places in the body. Where the fungus is found affects which symptoms may occur and what kind of evaluation is needed.
Candida in the gut
Candida can occur naturally in the gut. With an imbalance in the gut flora, some people suspect Candida overgrowth, especially with gas, bloating, altered bowel movements, or recurrent gastrointestinal discomfort. At the same time, such symptoms are nonspecific and can have many other causes, such as IBS, food intolerances, stress, inflammation, or infection.
Candida in the mouth
Oral thrush is a Candida infection in the oral cavity. It can cause white coatings, burning, taste changes, and discomfort. It is seen more often in infants, older adults, people with dry mouth, diabetes, inhaled corticosteroids, or a weakened immune system.
Candida in the genital area
Genital yeast infections are common and are often caused by Candida albicans. Typical symptoms can include itching, burning, redness, and curd-like discharge. Recurrent or severe yeast infections should be assessed by healthcare because other conditions can cause similar symptoms.
Why is species identification important?
Not all Candida species behave the same. Some species are more prone to forming biofilm, some are linked to hospital care, and others can be naturally resistant to specific antifungal agents.
Species identification is particularly important for:
- Recurrent infections
- Hard-to-treat fungal infections
- Suspicion of invasive candidiasis
- Infection in immunosuppressed individuals
- Infection linked to catheters, implants, or hospital care
- Suspected drug resistance
With mild and typical symptoms, advanced diagnostics are sometimes unnecessary. With long-lasting, recurrent, or severe symptoms, however, it is important not to guess, but to have healthcare perform tests and assess which species is involved.
Biofilm and hyphae – why some Candida species are harder to manage
An important feature of several Candida species is the ability to form biofilm. Biofilm can be described as a protective layer where fungal cells adhere to each other and to a surface, for example mucosa, a catheter, an implant, or a denture.
Candida albicans is also known for being able to switch between yeast form and hyphal form. Hyphae are thread-like structures that can help the fungus adhere, spread, and invade tissue. This is one of the reasons why Candida albicans is such a successful pathogen in overgrowth and infection.
Summary
There are many species of Candida and other fungi that can affect humans. The most common pathogenic species is Candida albicans, but species such as Candida glabrata, Candida parapsilosis, Candida tropicalis, Candida krusei, Candida auris and Candida lusitaniae are also important to know about.
Differences between species matter because they can vary in their ability to cause infection, form biofilm, spread in healthcare settings, and develop resistance to antifungal agents. With mild and typical symptoms, treatment can often be simple, but in recurrent, severe, or healthcare-associated infections, accurate diagnostics are crucial.
FAQ – common questions about Candida and fungi
Which Candida species is most common?
Candida albicans is the most common Candida species in human infections and often causes genital yeast infections, oral thrush, and other superficial Candida infections.
Is Candida always dangerous?
No. Candida can exist naturally in the body without causing problems. It is mainly with overgrowth, a weakened immune system, or spread to the blood and organs that Candida becomes medically serious.
What is the difference between Candida albicans and Candida auris?
Candida albicans is the most common and occurs naturally in many people. Candida auris is rarer but concerning because it can be multidrug-resistant, spread in healthcare settings, and be difficult to identify with older laboratory methods.
Can Candida cause digestive problems?
Candida can occur in the gut, but problems such as bloating, gas, and altered bowel habits can have many causes. With long-lasting or severe symptoms, you should investigate the cause rather than assume Candida is the problem.
Why is Candida glabrata harder to treat?
Candida glabrata can be less susceptible to certain antifungal agents than Candida albicans. Therefore, testing, species identification, and susceptibility testing can be important in more severe or recurrent infections.
