Candidiasis and Its Spectrum of Manifestation

What Is Candidiasis?

Candidiasis is an infection caused by the yeast (fungus) Candida albicans. It is an opportunistic infection and is usually confined to the skin, nails, mucous membranes, and gastrointestinal tract, but it can also infect internal organs and cause systemic disease. While it is typically harmless, it becomes infectious under favorable conditions, especially in immunocompromised individuals. It is also referred to as moniliasis, thrush, and candidosis.

Facts About Candidiasis:

Candida albicans, the causative yeast, is an opportunist par excellence. It flourishes in the warmth and moisture provided by the body folds, damaged nail cuticles due to prolonged contact with soap and water, altered vaginal pH, neonates, infants, malnourished, debilitated, and immunocompromised (HIV infection, diabetes mellitus, leukemia, steroid or immunosuppressive therapy) individuals.

The typical presentation of candidiasis is redness, tiny superficial pustules (pus-filled lesions), erosions, and overlying curdy white discharge. Some of its common manifestations are oral thrush, vulvovaginitis, intertrigo, paronychia, and balanoposthitis.

What Is Candida Albicans?

Candida albicans is an oval yeast that divides by budding. Apart from its yeast form, it can produce long chains of elongated cells (pseudohyphae) and occasionally continuous hyphae with cross walls. This ability to exist in hyphal and yeast forms is known as dimorphism. Both males and females are equally prone to get affected at all ages.

What Is Invasive Candidiasis?

Invasive candidiasis is a severe infection that affects blood, bones, eyes, and vital organs like the heart, brain, and others. It is different from chronic candidal infections in the oral cavity, vagina, and nails. The blood infection of Candida is known as candidemia, a severe condition that requires immediate medical intervention.

What Are the Symptoms and Signs of Invasive Candidiasis?

The signs and symptoms of invasive candidiasis and candidemia can be difficult to identify, as they often occur in people who are sick or recovering from surgery. General symptoms of invasive candidiasis are:

• Fever or chills.

• Abdominal pain.

• Muscle aches.

• Low blood pressure.

• Weakness or fatigue.

• Skin rashes.

Symptoms Specific to the Infection Site Include:

1. Invasive Candidiasis of the Eye:

• Sensitivity to light.

• Blurred vision.

• Vision changes.

2. Invasive Candidiasis of the Brain:

• Headaches.

• Memory loss.

• Confusion.

Diagnosis of Invasive Candidiasis:

Invasive candidiasis is diagnosed using a blood sample. The sample is sent to the laboratory, which is kept in a specialized medium to observe the candidal growth. The test takes a few days to check the growth and confirm the diagnosis.

Treatment of Invasive Candidiasis:

Invasive candidiasis is treated in a hospital setting, where antifungal medication is given directly into the bloodstream. The antifungal that can be used depends on the factors like:

• Age.

• Infection site and type.

• Infection severity.

• Immune function.

Antifungals That Are Used to Treat Invasive Candidiasis Are:

• Anidulafungin.

• Caspofungin.

• Fluconazole.

• Micafungin.

Treatment is given for two weeks till symptoms resolve and blood cultures confirm the absence of Candida. In severe cases, the treatment may be prolonged for more days.

What Are the Risk Factors of Candidiasis?

Candida albicans, usually a harmless resident of the throat, gut, and vagina, is a barometer of defective immunity causing opportunistic clinical infection during the following conditions.

• Maceration of the skin due to climate or clothing.

• Eczema (skin disease).

• Dentures (oral candidiasis).

• Diabetes.

• Pregnancy.

• Corticosteroids.

• Broad-spectrum antibiotics.

• Malignancy.

• HIV (human immunodeficiency virus).

What Are the Symptoms of Candidiasis?

1. Skin - Moist and macerated axilla, genitocrural, interdigital, and inframammary folds predominantly involve itchy red areas with satellite vesicles and pustules.

2. Oral Candidiasis- Oral candidal involvement can be acute pseudomembranous or atrophic. Acute pseudomembranous (thrush) is white curd-like patches over the tongue, buccal mucosa, palate, and gingiva. It can be scraped off, leaving a raw, bright red surface, and is the most typical type.

3. Genital -

• Balanitis or Balanoposthitis: Small papules and pustules appear on the glans, prepuce, or coronal sulcus and soon break down to leave superficial erythematous erosions with a surrounding collarette of scales.

• Vulvovaginal Candidiasis: Thick, creamy vaginal discharge associated with burning or itching.

4. Nails:

• Paronychia: Redness, swelling, and tenderness in the paronychial area.

Who Is at Risk of Developing Oral Candidiasis?

Oral, throat or esophageal candidiasis is rare in healthy adults. Those more prone to developing candidiasis in these areas include infants, especially those under one-month-old, as well as individuals with one or more of the following factors:

• Wearing dentures.

• Having diabetes.

• Having cancer.

• Having HIV/AIDS.

• Antibiotics or corticosteroids, such as inhaled corticosteroids, can be used for conditions such as asthma.

• Taking medications that lead to dry mouth or having medical conditions causing dry mouth.

• Smoking.

Individuals who develop candidiasis in the esophagus typically have weakened immune systems, meaning their bodies struggle to fight infections effectively. This group includes individuals living with HIV or AIDS (acquired immunodeficiency syndrome) and those with blood cancers such as leukemia and lymphoma. It is common for those with esophageal candidiasis to also have candidiasis in the mouth and throat.

How Is Candidiasis Manifested in HIV Patients?

In acute atrophic, raw erythematous areas are seen in people with HIV infection. Erythematous candidiasis is the most common manifestation in AIDS patients, affecting the dorsal tongue or palate and presenting with bright red patches. Oral candidiasis is a common, early, and often an initial presentation of HIV.

Oral infections that may predict the onset of other serious opportunistic diseases are:

• Angular cheilitis (fissuring of angles of the mouth).

• Chronic hyperplasia (adherent white patches with surrounding erythema).

• Median rhomboid glossitis (a central papillary atrophic condition of the tongue).

• Black hairy tongue (hypertrophic papillae on the tongue).

How Is Candidiasis Diagnosed?

• Scraping: 10 percent KOH (potassium hydroxide) mounts of the scrapings from the suspected site examined under a microscope reveal Candida as oval budding and elongated filamentous cells connected in a sausage-like manner (pseudohyphae).

• Culture: In Sabouraud dextrose agar (SDA), whitish mucoid colonies grow within two to five days.

What Is the Treatment for Candidiasis?

1. Oral Candidiasis Medication:

Local:

• Nystatin suspension (4,00,000 to 6,00,000 Units) should be topically applied four times daily. It should be held in the mouth and then swallowed.

• Local application of Clotrimazole mouth paint and Gentian violet one to two percent is also used to treat candidiasis.

Systemic oral candidiasis medication:

• Tablet Ketoconazole 200 mg per day for one to two weeks (in AIDS, the dose is 400 mg per day).

• Tablet Fluconazole 50 mg to 100 mg per day for seven days.

• Tablet Itraconazole 100 mg per day for 14 days.

2. Vulvovaginal Candidiasis: For vulvovaginal candidiasis, insert Clotrimazole suppository 500 mg at bedtime and take a tablet of Fluconazole 150 mg start (immediately).

3. Candidal Balanitis: For balanitis, apply Clotrimazole topical cream and take one 150 mg Fluconazole tablet.

4. Candidiasis in Skin: For skin, apply Nystatin cream and Miconazole cream topically to the affected area.

5. Paronychia: For nails, Miconazole topical and oral Ketoconazole or Fluconazole. Correction of predisposing factors and the use of topical or systemic antifungals in unresponsive or immunocompromised patients are essential for the treatment to be effective.

How Can Oral Candidiasis Be Prevented?

Oral candidiasis self-care can be done as the following:

• Maintaining good oral hygiene.

• When wearing dentures, they should be adequately removed and cleaned to prevent candidiasis formation.

• Rinsing the oral cavity after taking inhaled corticosteroids.

How Can Vulvovaginal Candidiasis Be Prevented?

• Wear cotton underwear.

• Avoid douching.

• Avoid tight-fitting underwear, pants, or skirts.

• Avoid bathing in hot waters or hot tubs.

• Do not stay in wet clothing for a long time.

• Make sure to change sanitary napkins or tampons frequently.

• Avoid using deodorants or pads and tampons that contain deodorants.

• Always wash underwear at high temperatures to remove microbes.

What Is the Concern of Antifungal Resistance in Candidiasis?

Resistance to antifungal drugs developed by the Candida species is a problem in treating candidiasis. About seven percent of candidal infections that have been diagnosed tend to have resistance against an antifungal drug called Fluconazole. There are several cases of antifungal resistance to Echinocandins. When there is an antifungal resistance to Fluconazole and Echinocandins, Amphotericin B remains the only remaining option, thus creating a shortage of treatment options.

Conclusion:

Candidiasis is an opportunistic fungal infection caused by Candida albicans. It can occur on the skin, mouth, genitals, and nails. Candidiasis in the mouth is referred to as oral thrush, and on the skin as cutaneous candidiasis. It causes whitish plaques in the affected areas, which can be treated with antifungal medications. The fungus Candida is present in the body and harmless, but when there is an infection, it causes candidiasis.