Thrush and Other Candida Infections
The fungus Candida is normally found on and in the body in
small amounts. It is present on the skin and in the mouth, as well as in the
intestinal tract and genital area. Most of the time, Candida does not
cause any symptoms. When these organisms overgrow, they can cause infections
(candidiasis), which sometimes can become chronic. If the fungus enters the
bloodstream, the infection can spread to other parts of the body. Bloodstream
infections are most common in newborns, children with long-term intravenous
catheters, and children with weakened immune systems caused by illnesses or
medicines.
Candidiasis can affect the skin, mucous membranes (eg, mouth,
throat), fingernails, eyes, and skin folds of the neck and armpits, as well as
the diaper region (eg, vagina, folds of the groin). The oral infection, called
thrush, frequently occurs in infants and toddlers. If Candida
infections become chronic or occur in the mouth of older children, they may
be a sign of an immune deficiency, such as human immunodeficiency virus (HIV)
infection. Very low birth weight babies are susceptible to candidiasis as well.
Newborns can acquire the infection from their mothers, not only while they’re
still in the uterus, but also during passage through the vagina during birth.
Most of these infections are caused by Candida albicans, a yeast-like
fungus, although other species of Candida are sometimes responsible. In
some cases, children can develop candidiasis after being treated with
antibacterials.
Signs and Symptoms
When an infant develops a Candida infection, symptoms can
include painful white or yellow patches on the tongue, lips, gums, palate (roof
of mouth), and inner cheeks. It can also spread into the esophagus, causing pain
when swallowing. Candidiasis can make a diaper rash worse, producing a reddening
and sensitivity of the affected area and a raised red border in some cases.
Teenaged girls who develop a yeast infection of the vagina and the surrounding
area may have symptoms such as itching; pain and redness; a thick, “cheesy”
vaginal discharge; and pain when urinating. Infection of the bloodstream occurs
in children who are hospitalized or at home with intravenous catheters. A yeast
infection often follows antibiotic therapy. Infections occur in children with
cancer who are receiving chemotherapy. In these cases, the fungus in the gut
gets into the blood system. Once in the blood, the yeast can travel throughout
the body, causing infection of the heart, lungs, liver, kidneys, brain, and
skin. The early signs of infection are fever and blockage of the intravenous
catheter.
How Is the Diagnosis Made?
Your pediatrician will often make the diagnosis by examining your
child and her symptoms. Scrapings of Candida lesions inside the mouth or
elsewhere can be examined under the microscope for signs of the infection. An
ultrasound or CT scan can detect candidal lesions that have developed in the
brain, kidney, liver, or spleen. Cultures of the blood or mouth lesions are
taken to grow the fungus in the laboratory and identify the type and sensitivity
of the yeast.
Treatment
Antifungal drugs are used to treat candidiasis. The antibiotic
nystatin is often prescribed for children with superficial infections such as
oral thrush or a Candida-related diaper rash. The specific medicines
given for candidiasis vary, depending on the part of the body where the
infection is concentrated. For example:
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Mouth and airway (associated with a weakened immune system): nystatin, clotrimazole, fluconazole, itraconazole
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Esophagus: nystatin, fluconazole, itraconazole
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Skin: topical medicines such as nystatin, miconazole, clotrimazole, naftifine, and ketoconazole, among others
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Vagina: topical clotrimazole, miconazole, butoconazole, terconazole, tioconazole
If candidiasis has spread through the bloodstream to various parts
of the body, your pediatrician will usually recommend treatment with an
intravenous medicine such as amphotericin B. This medicine causes many side
effects, but it is still a reliable medicine for serious, invasive fungal
infections.
What Is the Prognosis?
Once treatment starts, most candidiasis infections get better
within about 2 weeks. Recurrences are fairly common. Long-lasting thrush is
sometimes related to pacifiers. The infection is much more difficult to treat in
children with catheters or weakened immune systems. The catheter usually must be
removed or replaced and tests are done to determine whether infection has spread
to other parts of the body. Antifungal therapy may need to be given for weeks to
months.
Prevention
To reduce the risk of candidiasis in your baby’s diaper area, keep
the skin as clean and dry as possible, changing diapers frequently. Fungal
infections (thrush or vaginitis) often follow courses of antibacterials. To
avoid this, it is important to use antibiotics only when necessary. Oral
nystatin and fluconazole are often used to prevent candidiasis in children with
weakened immune systems.
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