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Medical Author: David Perlstein, MD, FAAP
Medical Editor: William C. Shiel Jr., MD, FACP, FACR
What are commonly known as "yeast" infections are caused by various species of a yeast-like fungus called Candida, particularly the species Candida albicans. Yeast organisms are part of the germs (including bacteria) that are normally found on various parts of the body and which ordinarily cause no symptoms.
Certain conditions, such as antibiotic use, may upset the balance of microbes in the body and allow an overgrowth of Candida. Yeast also can thrive in chronically moist folds of skin, such as in the groin.
Yeast infections may flare up and then heal in most people; however, in newborns or individuals with impaired immune systems, yeast can cause more serious or chronic infections.
Many infants acquire Candida infections from their mothers during the process of birth. Yeast exists naturally in the mother's vagina. When the child is delivered through the birth canal, the baby comes in contact with the yeast.
Many babies that escape this infection at birth soon acquire Candida from close contacts with other family members.
Thrush is yeast infection of the mouth and throat. Thrush can also be associated with yeast infection of the esophagus. Thrush appears as creamy white, curd-like patches on the tongue and inside of the mouth and back of the throat. As mentioned above, in individuals with impaired immune systems, yeast infections are more common. For example, in a non-infant population, thrush may be a sign of underlying HIV infection.
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