Wound myiasis occurs when fly larvae infest open wounds. This parasitism by brachyceran larvae causes the disease myiasis. A few cases of phorid flies opportunistically causing human myiasis have been reported. Maggots also occasionally infest the vulvar area, causing the condition called vulvar myiasis. Myiasis caused by the tumbu fly in Africa usually presents with cutaneous furuncles. "C. anthropophaga" rarely causes severe problems, and mainly causes cutaneous myiasis. The infestation by maggots of live animals is called myiasis. Occasionally, cases have been documented of human intestinal myiasis caused by the rat-tailed maggot. Animals infected with myiasis may die from toxemia and sepsis. On extremely rare occasions, hoverfly larvae have been known to cause accidental myiasis in humans. Such behaviour is known as enteric or intestinal myiasis. Accidental myiasis commonly is enteric, resulting from swallowing eggs or larvae with one's food. This bluebottle fly can also cause human or animal myiasis (parasitization in a living individual). Humans are not immune to the feeding habits of maggots and can also contract myiasis. Intestinal myiasis and urinary myiasis are especially difficult to diagnose.