Threadworm is the only common worm infestation in people in Australia and New Zealand and is highly contagious. The presence of tiny white threads around the anal region is a sign of threadworm infestation. Common symptoms include itching around the anus, restless sleep, grinding teeth and irritability. If a family member has threadworms then each member should be treated. Before treating infestation should be present. Vermox provides an effective one dose treatment for Threadworms. With Vermox you don't need to calculate body weight or complex dosage formulas.